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High water solubility with rapid dissolution in cold and warm water.
Excellent film-forming capability and strong adhesion to polar substrates.
Outstanding biodegradability and low environmental impact.
Consistent batch-to-batch quality backed by Kuraray’s stringent manufacturing control.
Low residual acetaldehyde content, meeting stringent regulatory requirements for food-contact and pharmaceutical applications.
Water-soluble packaging films for detergent pods and agrochemical formulations.
Binder in ceramic green bodies and refractory shaping processes.
Thickener and stabilizer in aqueous pigment dispersions and inkjet inks.
Protective colloid in emulsion polymerization of vinyl acetate and acrylic monomers.
Excipient in controlled-release pharmaceutical tablets and oral thin films.
| Chemical Type | Polyvinyl alcohol (partially hydrolyzed) |
| Product Form | White granular powder |
| Appearance | Free-flowing, odorless white granules |
| Saponification Degree | 87–89 mol% |
| Viscosity (4% aqueous solution at 20°C) | 22–25 mPa·s |
| Residual Acetate Content | 11–13 wt% |
| pH (1% aqueous solution) | 5.5–7.0 |
| Moisture Content | ≤5.0 wt% |
Q1: What distinguishes the CST grade of Kuraray POVAL PVA from other POVAL grades?
A: The CST grade is specifically formulated for cold-water solubility and rapid dissolution in ambient-temperature aqueous systems, making it especially suitable for applications requiring quick dispersion without heating—such as certain textile sizing, paper coating, or instant-dissolving film formulations.
Q2: Is POVAL PVA CST compatible with common industrial thickeners or rheology modifiers?
A: Yes, POVAL PVA CST generally exhibits good compatibility with non-ionic cellulose ethers (e.g., HEC, MC), acrylic thickeners, and associative thickeners when pH and ionic strength are appropriately controlled. Compatibility testing under actual formulation conditions is recommended due to potential sensitivity to multivalent ions or strong acids.
Q3: How does CST-grade PVA perform in adhesive applications requiring high green strength and low creep?
A: Due to its optimized degree of hydrolysis and molecular weight profile, POVAL PVA CST delivers strong initial tack and cohesive integrity during drying, supporting excellent green strength in water-based adhesives—particularly for laminating, packaging, and labeling where fast handling is critical.
Q4: Can POVAL PVA CST be used in environmentally sensitive applications such as agricultural films or dissolvable packaging?
A: Yes—POVAL PVA CST is inherently biodegradable under aerobic, microbial conditions and is widely selected for water-soluble films and temporary protective layers where controlled dissolution and environmental compatibility are required. Its performance in such applications depends on film thickness, humidity, and contact water volume.
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E-mail: wangxingqiang@ericwchem.com
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