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High water solubility with rapid dissolution in cold to warm water.
Excellent film-forming capability and strong adhesion to polar substrates.
Good compatibility with starch, cellulose derivatives, and various water-based resins.
Low residual acetaldehyde content, supporting stringent regulatory requirements for food-contact and pharmaceutical applications.
Consistent batch-to-batch reproducibility due to Kuraray’s controlled polymerization and hydrolysis process.
Water-soluble packaging films (e.g., detergent pods, agrochemical sachets).
Binder in ceramic and refractory green bodies for improved green strength and clean burnout.
Thickener and stabilizer in aqueous pigment dispersions for inkjet inks and textile printing pastes.
Protective colloid in emulsion polymerization of vinyl acetate and acrylic monomers.
| Chemical Type | Polyvinyl alcohol (partially hydrolyzed) |
| Product Form | White to off-white free-flowing granules |
| Appearance | Free-flowing granular solid |
| Saponification Degree (mol %) | 87–89 |
| Viscosity (4% aqueous solution at 20°C) | 4.6–5.4 mPa·s |
| Residual Acetate Content (wt %) | 10.5–12.5 |
| pH (1% aqueous solution) | 5.0–7.0 |
| Moisture Content (wt %) | ≤5.0 |
Q1: What is the primary functional advantage of POVAL PVA 205 MB in aqueous coating formulations?
A: POVAL PVA 205 MB offers excellent film-forming ability, water solubility, and adhesion to polar substrates—making it particularly effective as a binder and rheology modifier in water-based coatings, inks, and textile sizing applications.
Q2: How does the “MB” grade designation relate to its processing behavior?
A: The “MB” designation indicates that this grade is specifically optimized for medium viscosity development and balanced solubility—enabling rapid dissolution with minimal gelatinization during cold or warm water mixing, which supports efficient production scalability.
Q3: Is POVAL PVA 205 MB suitable for applications requiring film flexibility and low moisture sensitivity?
A: Yes—its moderate degree of hydrolysis and molecular architecture provide a favorable balance between film toughness and humidity resistance, supporting use in packaging adhesives and protective barrier layers where dimensional stability under ambient conditions is important.
Q4: Can POVAL PVA 205 MB be used in combination with other water-soluble polymers or crosslinkers?
A: Yes—it exhibits good compatibility with common cellulose derivatives, acrylic emulsions, and aldehyde-based crosslinkers (e.g., glyoxal), enabling formulation flexibility for enhanced water resistance or mechanical performance—subject to compatibility testing under specific process conditions.
Q5: What are typical handling and storage recommendations to maintain product integrity?
A: Store in a cool, dry environment below 30°C, protected from humidity and direct sunlight. Keep containers tightly sealed to prevent moisture absorption, which may affect dissolution rate and powder flow characteristics during handling.
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E-mail: wangxingqiang@ericwchem.com
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