VC/VAc Resins and Their Modification: An Analysis of VC/VAc Vinyl Resins for Coatings and Inks

1 What Are VC/VAc Resins?

1.1 Basic Definition

VC/VAc resins are generally based on vinyl chloride-vinyl acetate copolymer resins, commonly abbreviated as VC/VAc copolymer resins. In this abbreviation, VC stands for vinyl chloride and VAc stands for vinyl acetate. In practical applications, VC/VAc resins also include modified resins or terpolymers in which carboxyl, hydroxyl, vinyl alcohol, or other polar functional groups are further introduced into the VC/VAc copolymer structure.

In the coatings and inks industry, VC/VAc resins are usually used in the form of solid resins, resin powders, or resin solutions. Most VC/VAc resins are thermoplastic resins. In solvent-based coatings and inks, they mainly form films through solvent evaporation, so they are often used in physically drying systems. Some modified VC/VAc resins containing hydroxyl groups or other functional groups can also be used together with crosslinking components such as isocyanates and amino resins in systems that require higher resistance performance.

VC/VAc resins are not ordinary polyvinyl chloride resins. Ordinary polyvinyl chloride, or PVC, is mainly produced by polymerizing vinyl chloride. VC/VAc resins are usually produced by copolymerizing VC and VAc, or by further introducing polar functional groups into this structure. As a result, compared with ordinary PVC, these resins are more suitable for inks, coatings, and industrial coating applications in terms of solubility, flexibility, adhesion, and formulation adaptability.

1.2 Why They Are Typical Vinyl Resins in Coatings and Inks

In coatings and inks, the value of VC/VAc resins lies in their ability to achieve a good balance among adhesion, film formation, flexibility, water resistance, resistance to certain chemical media, and solvent processability.

Performance Aspect	Main Role of VC/VAc Resins
Adhesion	Provide good adhesion adaptability to substrates such as PVC, treated plastic films, metal foils, and paper
Film formation	Form transparent, continuous, and tough films
Flexibility	VAc units help reduce brittleness and improve bending and post-processing adaptability
Water resistance	VC units help improve film water resistance and cohesive strength
Medium resistance	Provide a certain level of resistance to oils, salt water, some acids and alkalis, and alcohol-based media
Solvent processability	Most VC/VAc resins are soluble in ketone solvents; some types are soluble in ester solvents or ketone/ester mixed solvent systems, making them suitable for solvent-based coatings and ink systems
Formulation adaptability	Can be used as main film-forming resins, co-resins, adhesion resins, ink binders, or heat-sealing resins

In coating and ink systems, VC/VAc resins are often discussed as typical vinyl resins. They can form films on their own, and they can also be blended with polyurethane, acrylic resins, epoxy resins, ketone resins, amino resins, and other resins depending on the specific resin type and formulation system. Such combinations are used to improve adhesion, flexibility, water resistance, resolubility, or heat-sealing performance. When they are blended with nitrocellulose, PVAc, PVB, and similar resins, compatibility may vary significantly, so solution clarity, storage stability, application viscosity, and film performance should be verified in advance.

2 How Structure Determines Performance

VC, VAc, molecular weight, and functional groups jointly determine the performance of the resin. The performance sources of VC/VAc resins can be summarized in three main aspects:

① VC units provide strength, water resistance, and resistance to certain chemical media;

② VAc units improve solubility, flexibility, and adhesion adaptability;

③ Molecular weight and K value affect solution viscosity, film strength, and application adaptability.

2.1 Role of Vinyl Chloride Units

VC units are an important source of film strength, water resistance, and medium resistance in VC/VAc resins. Because the VC structure contains chlorine atoms, the polymer chains have relatively high polarity and strong cohesive interactions, which help form tough films with good resistance to water and oils. The influence of VC units on performance is mainly reflected in the following aspects:

Structural Source	Effect on Performance
VC units	Improve film hardness, toughness, and mechanical strength
Chlorine-containing structure	Improve water resistance, oil resistance, and resistance to certain chemical media
Higher cohesive strength	Help improve abrasion resistance and film integrity
Thermoplastic characteristics	Beneficial for resolubility, heat sealing, and processable coating design

However, a higher VC content is not always better. When VC content increases, film hardness, water resistance, and medium resistance usually become more favorable. At the same time, however, resin solubility, flexibility, and low-temperature processing adaptability may decrease. Therefore, when selecting VC/VAc resins for coatings and inks, VC content should be balanced according to the target performance, rather than simply pursuing a high chlorine content.

2.2 Role of Vinyl Acetate Units

VAc units are key structural components that give VC/VAc resins good solubility, flexibility, and adhesion adaptability. Compared with VC units, VAc units can reduce the rigidity of the resin chains, improve the solubility of the resin in organic solvents, and enhance film flexibility and wetting ability on certain substrates. The role of VAc units can be summarized as follows:

Structural Source	Significance for Coatings and Inks
VAc units	Improve flexibility and reduce film brittleness
Ester group structure	Enhance wetting and adhesion to certain polar substrates
Good solvent affinity	Help reduce formulation viscosity and improve application and printing adaptability
Lower softening range	Helps lower the heat-sealing temperature of heat-sealing coatings

2.3 Influence of Molecular Weight and K Value

The molecular weight of VC/VAc resins significantly affects solution viscosity, film strength, resin dissolution rate, and application adaptability. In industrial technical literature, K value is commonly used to characterize the molecular weight of the resin and the corresponding viscosity characteristics. The general trends are as follows:

Molecular Weight / K Value	Effect on Formulation and Film
Higher K value	Higher solution viscosity, better film strength, and higher softening range
Lower K value	Lower solution viscosity; more suitable for high-solids, low-viscosity, or ink systems
Higher molecular weight	Helps improve film mechanical strength, abrasion resistance, and cohesion
Lower molecular weight	Beneficial for dissolution, leveling, wetting, and printing adaptability

Even within the same category of VC/VAc resins, different K values can lead to clearly different application directions. Ink systems often focus more on low viscosity, resolubility, and solvent release, while industrial coatings pay more attention to film strength, abrasion resistance, and adhesion retention after water exposure.

3 Value of Modified VC/VAc Resins

Ordinary VC/VAc copolymer resins already provide good film formation, adhesion, flexibility, and water resistance. However, in some coating and ink systems with higher performance requirements, they may still have limitations. For example:

① Insufficient adhesion to metals, glass, and mineral surfaces;

② Limited wetting and dispersion ability for pigments and inorganic fillers;

③ Unsatisfactory compatibility when blended with certain resins;

④ Lack of reactive functional groups when crosslinking reactions are required;

⑤ Insufficient water resistance, solvent resistance, or heat-mechanical performance in high-resistance industrial coatings.

In practical applications, modified VC/VAc resins are often prepared by introducing functional groups such as carboxyl or hydroxyl groups. The purpose of modification is to improve adhesion, wetting, compatibility, or reactivity for specific problems.

3.1 Carboxyl Modification: Improving Adhesion and Wetting

Carboxyl-modified VC/VAc resins are produced by introducing carboxyl groups, –COOH, into the VC/VAc backbone. Carboxyl groups have strong polarity and can enhance interactions between the resin and metal oxide layers, glass, mineral surfaces, and certain pigments and fillers. The main value of carboxyl modification is as follows:

Performance Aspect	Role of Carboxyl Modification
Metal adhesion	Improves adhesion to metal substrates such as aluminum, steel, and tinplate
Pigment wetting	Enhances wetting and dispersion of inorganic pigments, fillers, magnetic powders, and other particles
Film bonding stability	Improves bonding between the resin and the substrate
Blending performance	Helps form more stable systems with certain polar resins and additives

Carboxyl-modified VC/VAc resins are commonly used in metal coatings, can coatings, heat-sealing coatings, inks, and systems that require good pigment wetting.

Carboxyl modification also requires attention. While carboxyl groups increase resin polarity, they may also increase the system’s sensitivity to moisture, alkaline pigments and fillers, or metal ions. If the carboxyl content, solvent system, and additive selection are not properly matched, problems such as viscosity change, reduced storage stability, decreased water resistance, or film whitening may occur.

3.2 Hydroxyl Modification: Improving Compatibility and Crosslinking Capability

Hydroxyl-modified VC/VAc resins are resins in which hydroxyl groups, –OH, are introduced into the resin structure. The source and content of hydroxyl groups vary depending on the resin type, so the composition, hydroxyl value, and recommended crosslinking system should be based on the corresponding technical data. The main value of hydroxyl groups is to improve resin compatibility and enable the resin to participate in crosslinking reactions. The main functions of hydroxyl modification are as follows:

Formulation Direction	Role of Hydroxyl Modification
Two-component coatings	Can react with isocyanates to improve hardness, solvent resistance, and chemical resistance
Baking coatings	Can be used with amino resins and other components to increase film crosslink density
Blended systems	Improve compatibility with polyurethane, acrylic, epoxy, and other resins
High-performance coatings	Improve the balance among adhesion, abrasion resistance, and overall resistance performance

Hydroxyl-modified VC/VAc resins are suitable for systems with higher requirements for resistance performance, hardness, blending performance, or crosslinking capability. However, they also increase formulation complexity. When used with isocyanates or amino resins, attention should be paid to hydroxyl value, crosslinker dosage, pot life, curing conditions, and crosslink density. If crosslinking is insufficient, the improvement in resistance performance will be limited. If crosslinking is excessive, the film may become brittle and lose flexibility.

3.3 Modification Does Not Mean Overall Performance Improvement

The value of modified VC/VAc resins lies in solving specific problems, not in being superior to ordinary VC/VAc resins in every aspect.

Resin Type	Main Advantages	Points to Note
Ordinary VC/VAc copolymer resin	Good film formation, flexibility, solubility, and heat-sealing performance	Limited adaptability to metals, pigments/fillers, and crosslinking systems
Carboxyl-modified VC/VAc resin	Better adhesion and pigment wetting	Water resistance, viscosity, and storage stability need attention
Hydroxyl-modified VC/VAc resin	Better compatibility and crosslinking reactivity	Crosslinking system, pot life, and risk of film embrittlement need attention

Whether to choose ordinary VC/VAc resin or modified VC/VAc resin should be determined by the target application:

① Ordinary inks and heat-sealing coatings: focus on solubility, flexibility, resolubility, and heat-sealing performance;

② Metal coatings and can coatings: focus on adhesion provided by carboxyl groups;

③ Crosslinkable industrial coatings: focus on reactivity and compatibility provided by hydroxyl groups;

④ High-pigment-content systems: focus on improved pigment wetting from carboxyl groups or other polar groups.

4 Main Roles of VC/VAc Resins in Formulations

VC/VAc resins are not necessarily used only as main resins in coatings and inks. Depending on the formulation design objective, they can play different roles.

Formulation Role	Main Function	Typical Applications
Main film-forming resin	Forms a continuous film and provides adhesion, flexibility, and water resistance	Heat-sealing coatings, plastic coatings, certain inks
Co-resin	Improves adhesion, flexibility, water resistance, or compatibility	Industrial coatings, laminating inks, plastic coatings
Adhesion-promoting resin	Improves adhesion to plastics, metals, paper, and other substrates	Plastic coatings, metal coatings, packaging inks
Ink binder	Disperses pigments, forms the ink film, and improves resolubility and adhesion	Gravure inks, flexographic inks, packaging inks
Heat-sealing resin	Provides heat-seal strength and a heat-sealing processing window	Aluminum foil coatings, packaging coatings, heat-seal varnishes

5 Typical Application Areas

Application Area	Why VC/VAc Resins Are Suitable	Key Considerations
Printing inks	Good solubility, resolubility, adhesion, and flexibility	Solvent release, pigment wetting, substrate adhesion
Plastic coatings	Good adaptability to PVC, treated PET, ABS, and other substrates	Surface treatment, solvent attack, flexibility
Metal coatings	Carboxyl modification helps improve metal adhesion	Adhesion after water exposure, substrate treatment, corrosion resistance
Heat-sealing coatings	Thermoplasticity is beneficial for heat sealing and seal strength adjustment	Heat-sealing temperature, blocking resistance, oil resistance

5.1 Printing Inks

Printing inks require resins that can dissolve in suitable solvents and quickly form stable ink films after printing. VC/VAc resins can improve adhesion to films, aluminum foil, paper, and other substrates, while also providing flexibility, resolubility, and a certain level of water and oil resistance. When VC/VAc resins are used in inks, the focus is not on pursuing high strength alone, but on balancing the following properties:

① Solution viscosity;

② Pigment wetting;

③ Resolubility;

④ Solvent release;

⑤ Adhesion to substrates;

⑥ Ink film flexibility;

⑦ Rub resistance and water resistance.

If the system contains a high pigment loading, or if there are high wetting requirements for metallic powders, inorganic pigments, magnetic pigments, and similar materials, carboxyl-modified VC/VAc resins usually have advantages.

5.2 Plastic Coatings

Plastic coatings require good resin adhesion and flexibility. VC/VAc resins have good adaptability to PVC and certain surface-treated plastic films, and can be used in plastic surface coatings, packaging film coatings, and plastic ink systems.

In plastic coatings, solvent effects require special attention. Good resin adhesion does not necessarily mean that the system will be stable. If the solvent acts too strongly on the substrate, it may cause whitening, cracking, deformation, or stress damage of the plastic. If the solvent action is too weak, it may lead to insufficient coating wetting and poor adhesion. When VC/VAc resins are used in plastic coatings, resin type, solvent system, substrate surface treatment, and film flexibility should all be considered together.

5.3 Metal Coatings

Metal coatings require resins that can provide stable adhesion to metal surfaces and maintain film bonding after exposure to water, humid heat, or corrosive media. Ordinary VC/VAc resins have a certain level of adhesion adaptability to metals, but in metal coatings with higher requirements, carboxyl-modified VC/VAc resins are more commonly used.

Carboxyl groups can enhance interactions between the resin and the metal surface oxide layer, helping improve metal adhesion. These resins can be used in metal primers, can coatings, aluminum foil coatings, and certain industrial protective coatings.

It should be noted that metal coatings should not be evaluated only by initial adhesion. Adhesion retention after water immersion, humid heat, salt spray, or medium exposure often better reflects the actual reliability of the resin and formulation.

5.4 Heat-Sealing Coatings

Heat-sealing coatings require the resin to soften, wet the surface, and form a seal under heat-pressing conditions, while maintaining seal strength after cooling. The thermoplasticity and adjustable softening range of VC/VAc resins make them suitable for heat-sealing coatings on packaging substrates such as aluminum foil, PVC, PET, and paper. In heat-sealing coatings, resin selection needs to balance the following:

① Heat-seal initiation temperature;

② Heat-seal strength;

③ Substrate adhesion;

④ Blocking resistance;

⑤ Water and oil resistance;

⑥ Film transparency and appearance.

If the resin is too soft, tackiness, insufficient blocking resistance, or reduced heat resistance may occur. If the resin is too hard, the heat-sealing temperature may be too high or sealing may be insufficient. Therefore, VAc content, K value, softening range, and plasticizing components all need to be properly matched. For food packaging, pharmaceutical packaging, beverage cans, or other direct or indirect contact applications, compliance and migration performance should also be confirmed according to the specific resin type, coating structure, conditions of use, and regulations in the target market.

6 Key Factors in Resin Selection

6.1 VC/VAc Ratio

The VC/VAc ratio determines the basic performance direction of the resin.

Indicator	Main Influence
Higher VC content	Usually better hardness, water resistance, medium resistance, and film strength
Higher VAc content	Usually better solubility, flexibility, low-temperature processing, and heat-sealing adaptability

In practical selection, the application target should guide the decision:

① Inks: greater focus on solubility, low viscosity, resolubility, and adhesion;

② Heat-sealing coatings: greater focus on softening range, seal strength, and blocking resistance;

③ Metal coatings: greater focus on adhesion, adhesion after water exposure, and corrosion resistance;

④ Plastic coatings: greater focus on substrate wetting, flexibility, and solvent adaptability.

6.2 K Value and Molecular Weight

K value affects resin solution viscosity, film strength, and processing adaptability.

Application Requirement	Selection Focus
Low viscosity, high solids	Focus on lower K value or lower molecular weight types
High film strength	Focus on higher K value or higher molecular weight types
High-speed printing	Focus on dissolution rate, resolubility, and solvent release
Heat-sealing coatings	Focus on softening range, seal strength, and blocking resistance
Industrial coatings	Focus on mechanical strength, adhesion, and performance after water exposure

A high K value is not necessarily suitable for every system. A high K value may improve film strength, but it also increases viscosity, limiting solids content and application adaptability.

6.3 Carboxyl Groups, Hydroxyl Groups, Acid Value, and Hydroxyl Value

If modified VC/VAc resins are used, particular attention should be paid to the type and content of functional groups.

Indicator	Main Significance
Carboxyl groups	Improve metal adhesion, pigment wetting, and adaptability to polar substrates
Acid value	Reflects carboxyl group content and affects adhesion, wetting, water resistance, and stability
Hydroxyl groups	Improve compatibility and provide the possibility of crosslinking reactions
Hydroxyl value	Reflects hydroxyl group content and affects crosslinker dosage and crosslink density

Both carboxyl and hydroxyl groups can enhance resin functionality, but they also change system polarity, solvent adaptability, and storage stability. Resin selection should be based on target performance rather than simply pursuing a high acid value or high hydroxyl value.

6.4 Solubility and Solvent System

The actual performance of VC/VAc resins depends heavily on the solvent system. Most VC/VAc resin types have good solubility in ketone solvents. Some high-VAc-content or specially modified types can achieve good dissolution in certain ester solvents, glycol ether ester solvents, or ketone/ester mixed solvent systems. Aromatic hydrocarbons, alcohols, and aliphatic hydrocarbons are usually not suitable as sole solvents and are more often used to adjust the solvent system. Their applicability should be verified based on the resin type, solvent ratio, solution clarity, viscosity, and storage stability. Different VAc contents, molecular weights, and functional group types will affect resin dissolution rate, solution clarity, and viscosity. The solvent system should take the following factors into account:

Solvent Factor	Effect on Formulation
Solvency	Determines whether the resin can be completely dissolved
Evaporation rate	Affects leveling, drying, pinholes, and residual solvent
Effect on substrate	Affects solvent attack on plastics, whitening, cracking, and adhesion
Dilution capability	Affects cost, application viscosity, and film appearance
Environmental requirements	Affect VOC emissions and application safety

In solvent-based coatings and inks, VOCs, odor, residual solvent, and application safety are all factors that must be considered in VC/VAc resin systems.

6.5 Tg, Softening Range, and Compatibility

Glass transition temperature is abbreviated as Tg. Tg and the softening range affect film hardness, flexibility, blocking resistance, heat-sealing temperature, and heat resistance.

Change in Indicator	Main Influence
Higher Tg or softening range	Harder film and better blocking resistance, but flexibility and heat-sealing performance may decrease
Lower Tg or softening range	Better flexibility and low-temperature heat-sealing performance, but higher risk of tackiness

Compatibility is also important. VC/VAc resins are often used together with PU, acrylic, epoxy, nitrocellulose, amino resins, and other resins. If compatibility is insufficient, problems such as turbidity, precipitation, gloss loss, whitening, abnormal viscosity, or film embrittlement may occur.

7 Limitations and Precautions

7.1 Weather Resistance Is Not Their Strong Point

VC/VAc resins are suitable for many inks, packaging coatings, plastic coatings, metal coatings, and general industrial coatings. However, they should not be used simply as the sole main resin for high-weatherability outdoor topcoats. For outdoor coatings requiring long-term resistance to strong UV exposure, high color retention, and high chalking resistance, they usually need to be compared with resin systems that have stronger weather resistance, such as acrylic, polyurethane, silicone-acrylic, and fluorocarbon systems.

7.2 Not Suitable as a Direct Replacement for Heavy-Duty Anticorrosive Resins

VC/VAc resins have a certain degree of water resistance, oil resistance, and resistance to some chemical media, but they are not heavy-duty anticorrosive resins. For long-term immersion, strong acids, strong alkalis, strong solvents, or highly corrosive chemical environments, specialized anticorrosive systems such as epoxy, vinyl ester, and glass flake systems are usually required.

7.3 Possible Softening or Tackiness at High Temperatures

Most VC/VAc resins are thermoplastic resins. Thermoplasticity is beneficial for resolubility and heat sealing, but under high temperature, heat pressing, coil rewinding, or stacked storage conditions, it may also lead to softening, tackiness, indentation, or insufficient blocking resistance. In heat-sealing coatings, packaging coatings, and plastic coatings, attention should be paid to:

① Tg;

② Softening range;

③ Molecular weight;

④ Plasticizer dosage;

⑤ Wax powder or anti-blocking additives;

⑥ Drying conditions and residual solvent.

Heat-sealing performance and blocking resistance often need to be optimized together. Low-temperature sealing should not be pursued alone.

7.4 The Solvent System Determines Actual Performance

Whether VC/VAc resins can deliver their performance depends to a large extent on the solvent system. Even when the resin selection is correct, an unsuitable solvent system may cause incomplete dissolution, cloudy resin solution, abnormal viscosity increase, film whitening, poor leveling, pinholes caused by overly fast drying, solvent attack, cracking or deformation of plastic substrates, or excessive residual solvent.

Therefore, screening of VC/VAc resins should be carried out together with solvent system evaluation. This is especially important for inks and plastic coatings, where resin solubility, solvent evaporation rate, substrate solvent resistance, and printing/application conditions need to be verified together.

7.5 Different Types of VC/VAc Resins Cannot Be Simply Substituted

Although they may all be called VC/VAc resins, different types can show clear differences in monomer composition, molecular weight, functional groups, and solubility. These differences directly affect solution viscosity, film strength, adhesion, flexibility, heat-sealing performance, and compatibility with other resins.

Main Difference	Effect on Formulation
VC/VAc ratio	Affects hardness, flexibility, water resistance, solubility, and heat-sealing performance
Molecular weight / K value	Affects solution viscosity, film strength, resolubility, and application adaptability
Carboxyl or hydroxyl content	Affects metal adhesion, pigment wetting, compatibility, and crosslinking reactivity
Tg and softening range	Affect blocking resistance, heat resistance, flexibility, and heat-sealing temperature
Solvent solubility	Affects resin dissolution rate, solution clarity, and film appearance

Therefore, different VC/VAc resin types should not be directly substituted simply because they belong to the “same resin category.” During substitution, special attention should be paid to solubility, system compatibility, application viscosity, adhesion, flexibility, heat-sealing performance, and storage stability. For inks, plastic coatings, metal coatings, and heat-sealing coatings, changes in resin type may directly affect application and post-processing performance, so confirmation through formulation testing is required.

8 Classification Table of Representative Chemicals Related to VC/VAc Resins and Their Modification

Table 1 Basic Resins, Key Monomers, and Analytical Standards

Category	CAS No.	Aladdin Cat. No.	Name	Specification or Purity	Product Features and Applications
Basic resin	9002-86-2	P107106	Polyvinyl Chloride (PVC)	K-value 72–71	A vinyl chloride structural reference resin. It can be used for comparative studies on the solubility of chlorine-containing resins, plasticizer compatibility, and coating substrate performance.
Basic resin	9003-20-7	P304881	Polyvinyl Acetate (PVAc)	approx. M.W. 500000	A vinyl acetate structural reference resin. It can be used for comparative studies on how vinyl acetate structures in VC/VAc copolymers affect solubility, flexibility, and adhesion.
Key monomer	108-05-4	V104471	Vinyl Acetate	Chemically pure (CP), ≥98%	A source of vinyl acetate structures in VC/VAc resins. It can be used for studies on copolymerization, grafting, and vinyl resin composition.
Analytical standard	75-01-4	V196529	Vinyl Chloride Standard Solution	100 μg/mL in methanol	Used for method development, quantitative calibration, and quality control in the analysis of vinyl chloride residues, migration, and monomer content.

Table 2 Monomers Related to Carboxyl, Hydroxyl, and Epoxy Functionalization Studies

Category	CAS No.	Aladdin Cat. No.	Name	Specification or Purity	Product Features and Applications
Hydroxyl-modifying monomer	868-77-9	H140643	2-Hydroxyethyl Methacrylate (HEMA)	Anhydrous grade, ≥99%, contains 200 ppm MEHQ as stabilizer, water ≤0.1%	Introduces hydroxyl reactive sites. It can be used for studies on vinyl resin functionalization, hydroxyl model systems, crosslinked coatings, and resin compatibility.
Carboxyl-modifying monomer	79-10-7	A397753	Acrylic Acid	Anhydrous grade, ≥99%, contains 200 ppm MEHQ as stabilizer	Introduces carboxyl-containing polar structures. It is used in studies related to improved metal adhesion, pigment wetting, and acid value adjustment.
Carboxyl-modifying monomer	79-41-4	M434201	Methacrylic Acid	Suitable for synthesis, stabilized with hydroquinone monomethyl ether	Used for studies on carboxyl-modified copolymerization, acid value adjustment, adhesion improvement, and adhesion evaluation after water exposure.
Carboxyl-modifying monomer	110-16-7	M108865	Maleic Acid	Moligand™, chemically pure (CP), ≥99%	Provides a dicarboxylic acid structure. It can be used in studies on carboxyl-modified VC/VAc resins, metal adhesion, and the introduction of polar groups.
Anhydride-modifying monomer	108-31-6	M116389	Maleic Anhydride	AR, ≥99% (GC)	Used in studies on anhydride-type polar modification, carboxylated copolymerization reactions, pigment wetting, and metal adhesion modification.
Epoxy-functional monomer	106-91-2	G106686	Glycidyl Methacrylate	≥97%, contains 100 ppm MEHQ as stabilizer	Introduces epoxy reactive sites. It is used in studies on reactive vinyl resins, adhesion modification, and post-crosslinking systems.
Hydroxyl-modifying monomer	818-61-1	H104535	2-Hydroxyethyl Acrylate	≥96%, contains 200–600 ppm MEHQ as inhibitor	Introduces hydroxyl structures. It can be used in studies on vinyl resin functionalization, isocyanate crosslinking models, and compatibility in blended systems.
Hydroxyl-modifying monomer	25584-83-2	H156905	Hydroxypropyl Acrylate (mixture of 2-hydroxypropyl acrylate and 2-hydroxy-1-methylethyl acrylate)	≥90% (GC), contains MEHQ as stabilizer	Provides hydroxyl reactive sites. It can be used in model studies on hydroxylated vinyl resins, coating film crosslinking, and flexibility adjustment.

Table 3 Crosslinking Reaction and Curing Modification Components

Category	CAS No.	Aladdin Cat. No.	Name	Specification or Purity	Product Features and Applications
Amino crosslinking-related component	108-78-1	T431382	2,4,6-Triamino-1,3,5-triazine	Suitable for synthesis	A raw material related to amino resin synthesis. It can be used in studies on amino crosslinking systems. In practical baking coatings, commercially available etherified amino resins are usually used for crosslinking with hydroxyl resins and should be selected according to the specific system.
Isocyanate crosslinker	822-06-0	H106723	Hexamethylene Diisocyanate (HDI)	Moligand™, ≥99%	Can react with hydroxyl-modified VC/VAc resins. It is used in studies on polyurethane-crosslinked coatings, abrasion resistance, and solvent resistance.
Isocyanate crosslinker	4098-71-9	I109582	Isophorone Diisocyanate (mixture of isomers) (IPDI)	≥99%	Can form crosslinked structures with hydroxyl-modified resins. It is used in studies on flexible, weather-resistant, and chemically resistant coatings.

Table 4 Representative Solvents Related to VC/VAc Resin Dissolution and Coating/Ink Solvent Systems

Category	CAS No.	Aladdin Cat. No.	Name	Specification or Purity	Product Features and Applications
Ester solvent	141-78-6	E119698	Ethyl Acetate	Anhydrous grade, ≥99.8%	Can be used for solubility screening of certain VC/VAc resin types, ink dilution, evaporation-rate adjustment, and studies on fast-drying coating systems.
Aromatic hydrocarbon solvent	108-88-3	T399633	Toluene (controlled precursor chemical)	Anhydrous grade, ≥99.8%	Usually not used as a sole solvent for VC/VAc resins. It can be used for solvent-system blending, resin compatibility evaluation, and coating drying-window studies. Regulatory, safety, and odor requirements should be considered.
Ester solvent	123-86-4	B119685	Butyl Acetate	Anhydrous grade, ≥99%	Used to adjust leveling, open time, evaporation profile, and film appearance in VC/VAc resin coatings.
Ketone solvent	67-64-1	A399717	Acetone (controlled precursor chemical)	Reagent grade, ≥99.5%	Used for rapid solubility screening of VC/VAc resins, cleaning, dilution, and experiments involving fast-evaporating systems.
Ketone solvent	108-94-1	C295202	Cyclohexanone	≥99.8%	Can be used in studies on strong solvent systems for VC/VAc resins, resin solubility screening, and solvent-system blending, as well as evaluations of leveling, drying window, and film appearance.
Ketone solvent	78-93-3	B1506282	Methyl Ethyl Ketone (MEK) (controlled precursor chemical)	AR, ≥99%	Used in VC/VAc resin ink and coating systems. It is suitable for studies on solubility, resolubility, and fast-drying performance.
Alcohol solvent	67-63-0	I112011	Isopropanol (IPA)	AR, ≥99.7%	Usually not used as a sole solvent for VC/VAc resins. It can be used to adjust solvent systems, reduce overall solvency, and improve drying and application windows. The specific addition level should be verified through solution clarity and storage stability tests.
Ketone solvent	108-10-1	M492092	Methyl Isobutyl Ketone (MIBK)	≥99%	Used for VC/VAc resin dissolution and medium-volatility solvent blending. It can be used in studies on leveling, drying, and coating film defect control.

Note: The products listed above are representative Aladdin products. More product specifications can be searched on the Aladdin official website by product name, CAS number, or catalog number. The solvents listed in the table are representative solvents for experimental or formulation research. Actual use should be verified based on resin type, solvent ratio, solution clarity, viscosity, and storage stability.

References

[1] WACKER Chemie AG. VINNOL® Resins: Product Overview. WACKER Technical Brochure.

[2] WACKER Chemie AG. VINNOL® Vinyl Chloride Co- and Terpolymers. WACKER Product Information.

[3] Nissin Chemical Industry Co., Ltd. SOLBIN: Vinyl Chloride-Vinyl Acetate Based Copolymer. Product Information.

[4] Shin-Etsu Chemical Co., Ltd. Vinyl Chloride-Vinyl Acetate Based Copolymer: SOLBIN. Product Information.

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