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High water solubility with rapid dissolution in cold and warm water.
Excellent film-forming capability yielding strong, flexible, and transparent films.
Superior adhesion to polar substrates including paper, cellulose, metals, and ceramics.
Low residual acetate content ensuring high hydrolysis degree and enhanced biodegradability.
Consistent batch-to-batch quality supported by Kuraray’s stringent GMP-compliant manufacturing.
Water-soluble packaging films for agrochemicals, detergents, and industrial cleaners.
Binders in ceramic green bodies and refractory shaping processes.
Thickener and stabilizer in aqueous pigment dispersions for textile printing pastes.
Protective colloids in emulsion polymerization of vinyl acetate and acrylic monomers.
Temporary coating for surface protection during metal stamping and precision machining.
| Chemical Type | Polyvinyl alcohol (fully hydrolyzed) |
| Product Form | White granular powder |
| Appearance | Free-flowing white granules, odorless |
| Saponification Degree | ≥ 98.5 mol% |
| Viscosity (4% aqueous solution at 20°C) | 21.0–23.0 mPa·s |
| Residual Acetate Content | ≤ 1.5 mol% |
| pH (5% aqueous solution) | 5.0–7.0 |
| Volatiles (105°C, 2 h) | ≤ 5.0 wt% |
Q1: What is the typical degree of hydrolysis and molecular weight range for POVAL PVA 220?
A: POVAL PVA 220 is a partially hydrolyzed polyvinyl alcohol with a nominal degree of hydrolysis around 88–90 mol%, offering a balance of water solubility and film-forming capability. Its viscosity-average molecular weight is in the medium range, supporting good cohesive strength while maintaining processability in aqueous systems.
Q2: How does POVAL PVA 220 perform in adhesive formulations compared to fully hydrolyzed PVAs?
A: Due to its partial hydrolysis, POVAL PVA 220 exhibits improved flexibility, lower moisture sensitivity, and enhanced compatibility with hydrophobic additives—making it especially suitable for paperboard laminating adhesives, textile sizing, and temporary binders where controlled film toughness and rewettability are required.
Q3: Is POVAL PVA 220 suitable for use in food-contact applications?
A: Yes—POVAL PVA 220 is manufactured under strict quality control and complies with global food-contact regulations for indirect use, including FDA 21 CFR §170–186 and relevant EU requirements for PVOH-based materials. Final compliance depends on formulation, processing conditions, and end-use configuration.
Q4: What are the recommended dissolution conditions for POVAL PVA 220?
A: For optimal dissolution, gradually disperse the powder into cold water with vigorous agitation to prevent agglomeration, then heat the slurry to 85–95°C while maintaining stirring until fully clear and homogeneous. Avoid prolonged high-temperature exposure before complete dispersion to minimize thermal degradation.
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