N-Vinylpyrrolidone/N-Vinylimidazole Copolymer (VP/VI) | SIOResin®

What is N-Vinylpyrrolidone/N-Vinylimidazole Copolymer (VP/VI)?

N-Vinylpyrrolidone/N-Vinylimidazole Copolymer (VP/VI) is a functional random copolymer formed by the polymerization of N-vinylpyrrolidone (VP) and N-vinylimidazole (VI) monomers in controlled ratios. It can be supplied in different commercial forms, including solid powder, granules, or liquid systems, depending on polymerization route and application requirements.

Structurally, VP/VI combines two complementary functional segments:

• The hydrophilic lactam structure of N-vinylpyrrolidone (VP), which provides excellent solubility, film-forming ability, and pigment encapsulation performance
• The imidazole functionality of N-vinylimidazole (VI), which introduces weak cationic character and strong affinity toward anionic species such as dyes

This dual-functional architecture enables VP/VI copolymers to interact with both dissolved dyes and dispersed pigments, making them highly effective in color control, dispersion stabilization, and anti-redeposition systems.

At SIOResin, we design VP/VI materials as performance-driven polymers for complex chemical environments where stability, compatibility, and color management are critical.

Chemical Identity and Physical Characteristics

N-Vinylpyrrolidone/N-Vinylimidazole Copolymer (VP/VI) typically shows the following characteristics:

• CAS No.: 29297-55-0
• Appearance: Light yellow to yellow liquid (or solid depending on grade)
• Solubility: Soluble in water, alcohols, DMF, and DMSO
• Stability: Stable under sealed storage at room temperature
• pH range (solution form): typically weakly alkaline

How VP/VI Copolymer Works?

The performance of VP/VI is based on a dual-mechanism color control system:

1. Electrostatic dye binding (VI segment)

The imidazole groups provide weak cationic sites that attract and bind negatively charged dye molecules, especially reactive and anionic dyes in aqueous systems.

2. Encapsulation and stabilization (VP segment)

The pyrrolidone units surround pigment or dye molecules, forming a protective colloidal layer that prevents redeposition onto substrates.

This combination leads to a stable system where free dyes are efficiently captured and kept in dispersion, reducing staining and improving wash performance.

SIOResin® H-1611 VP/VI Copolymer Physical Properties (Typical Data)

Price: USD $7.90/KG      Download TDS

Key Performance Features

At SIOResin, we focus on real-world performance rather than theoretical chemistry. VP/VI copolymer delivers several practical advantages:

• Strong anti-redeposition performance
  It effectively prevents free dyes from reattaching to fabric surfaces during washing cycles, especially in reactive dye systems and denim washing processes.
• 2. High stability in harsh conditions
  VP/VI maintains performance in High-salt environments, Hard water systems and Low-temperature washing conditions. This makes it suitable for industrial cleaning systems worldwide.
• Energy-saving formulation support
  Because it improves dye removal efficiency, it enables lower washing temperatures,reduced rinsing steps and lower water and energy consumption. In many industrial systems, this translates into measurable operational cost savings.
• Multi-functional behavior
  Depending on dosage, VP/VI can function as Anti-staining agent, Stripping auxiliary and Color correction additive. This flexibility reduces the need for multiple specialty chemicals in one formulation.
• Excellent formulation compatibility
  It is fully compatible with Anionic and nonionic surfactants, Dyeing auxiliaries and Water-based industrial systems. No precipitation or phase separation occurs under normal conditions.

N-Vinylpyrrolidone/N-Vinylimidazole Copolymer Application Areas

N-Vinylpyrrolidone/N-Vinylimidazole Copolymer is widely used in industries where color stability, dye control, and dispersion management are important.

1. Textile dyeing and printing

We recommend VP/VI for:

• Reactive dye anti-backstaining
• Denim garment washing
• Printing white ground protection
• Blended fabric cleaning improvement
• Color correction of lightly stained fabrics

2. Detergent and cleaning systems

It is widely used in:

• Laundry detergents and liquid capsules
• Color-capture laundry sheets
• Industrial hotel linen washing
• Wool and silk specialty detergents

3. Personal care applications

In hair and cosmetic systems, VP/VI can:

• Reduce hair dye fading
• Improve conditioning performance
• Enhance antistatic properties

4. Agrochemical formulations

It acts as:

• Dispersant for suspension concentrates (SC)
• Stabilizer for water-soluble fertilizers
• Anti-settling agent for colored formulations

5. Other industrial uses

It is also applied in:

• Pigment dispersion systems
• Paper color uniformity control
• Wastewater decolorization assistance

Why SIOResin VP/VI Copolymer?

At SIOResin, we develop VP/VI not as a generic additive, but as a functional control polymer for color chemistry systems.

In real industrial use, our VP/VI copolymer consistently helps customers achieve:

• Cleaner washing systems
• Reduced dye contamination
• More stable formulations
• Improved process efficiency

It is a practical solution for industries that demand consistent color performance under real-world conditions.

Frequently Asked Questions (FAQ)

Q1: Is VP/VI copolymer always supplied as a liquid?

No. VP/VI can be supplied in liquid, powder, or granular form depending on polymerization and application requirements.

Q2: What makes VP/VI different from PVP?

PVP provides mainly encapsulation performance. VP/VI adds weak cationic dye-binding ability, significantly improving anti-redeposition performance.

Q3: Can VP/VI be used in hard water systems?

Yes. It is stable in high hardness and high electrolyte environments.

Q4: Is it suitable for low-temperature washing?

Yes. It maintains strong anti-staining performance even at low temperatures.

Q5: Does VP/VI improve energy efficiency?

Yes. By improving dye removal efficiency, it reduces washing cycles, water usage, and energy consumption.

About SIOResin

SIOResin(Guangzhou SIO New Material) is a leading manufacture specializing in developping sustainable products and technologies in new material field. We provide professional solutions regarding water-based polyurethane, water-based acrylic resin, water-based UV-curing resin, silicone resin, polyethylenimine (PEI), polysilazane resin, additives and curing Agents etc., which have been widely applied in various industries, such as coatings, cosmetics, textiles, biology, automotive and other high-tech industries.

Please feel free to contact us via Email sales@sioresin.com if you would like to learn more about our products or request samples!