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This Kuraray Polyvinyl alcohol PVA series combines controlled hydrolysis technology with tailored molecular architectures. Engineered for high-purity applications, the formulations balance aqueous solubility with mechanical integrity through optimized chain configurations, achieving durable film formation and substrate adhesion without compromising process efficiency.
The series excels in environments requiring simultaneous material cohesion and controlled dissolution. Its oil-resistant backbone ensures stable performance in chemical-intensive applications like PVC dispersion stabilization, while the thermally stable structure (up to 180°C processing) supports high-temperature coating operations. The low-foam variants minimize bubble formation during high-shear mixing, enhancing production continuity in adhesive manufacturing and textile sizing processes.
Optimized Solubility: Partially hydrolyzed structure ensures balanced water solubility and film integrity
Versatile Viscosity: Medium viscosity range enables smooth application in various formulations
Enhanced Chemical Resistance: Provides excellent resistance to oils, chemicals and harsh environments
Strong Adhesion: Bonds effectively to porous substrates while maintaining film clarity
Adhesive Systems: Used in construction adhesives and bonding applications requiring foam reduction
Paper Coatings: Improves surface quality and printability in paper finishing processes
Textile Processing: Enhances fiber treatment in sizing and dyeing applications
Specialty Films: Suitable for water-soluble packaging and controlled-release films
| Model | Degree of Saponification (Hydrolysis) | Volatile Matter | pH (10% Solution) | Viscosity (4% Aqueous, 20°C) |
| PVA 205 | 88 ± 0.5 mol% | ≤5.0% | 5.0–7.0 | 21–25 mPa·s |
| PVA217 | 88 ± 0.5 mol% | ≤5.0% | 5.0–7.0 | 21–25 mPa·s |
| PVA224 | 88 ± 0.5 mol% | ≤5.0% | 5.0–7.0 | 21–25 mPa·s |
| PVA505 | 88 ± 0.5 mol% | ≤5.0% | 5.0–7.0 | 21–25 mPa·s |
| PVA 205S | 88 ± 0.5 mol% | ≤5.0% | 5.0–7.0 | 21–25 mPa·s |
| PVA 205MB | 88 ± 0.5 mol% | ≤5.0% | 5.0–7.0 | 21–25 mPa·s |
| PVA420H | 87.0–89.0 mol% | ≤5.0% | 5.0–7.0 | 20–24 mPa·s |
| PVA KL318 | 88 ± 0.5 mol% | ≤5.0% | 5.0–7.0 | 21–25 mPa·s |
| PVA235 | 87.0–89.0 mol% | ≤5.0% | 5.0–7.0 | 20–24 mPa·s |
| PVA224 (2nd entry) | 87.0–89.0 mol% | ≤5.0% | 5.0–7.0 | 20.5–24.5 mPa·s |
Q1: What is the primary functional role of this PVA grade in aqueous formulations?
A: This Kuraray PVA grade functions primarily as a water-soluble film former and rheology modifier, offering good cohesive strength and substrate adhesion in coatings, adhesives, and binder systems.
Q2: Is this PVA suitable for applications requiring thermal stability during processing?
A: Yes — it exhibits typical thermal stability for polyvinyl alcohol grades, maintaining integrity under standard aqueous processing conditions below its decomposition onset; prolonged exposure above 200 °C is not recommended.
Q3: How does this PVA grade behave in terms of solubility and dissolution rate?
A: It dissolves readily in warm water with moderate agitation, forming clear, low-viscosity solutions; dissolution time and clarity depend on particle size distribution and water temperature, but full hydration is typically achieved within minutes under controlled conditions.
Q4: Can this PVA be used in combination with other water-soluble polymers or crosslinkers?
A: Yes — it is generally compatible with common water-soluble additives such as cellulose derivatives, acrylic emulsions, and aldehyde-based crosslinkers, though compatibility should be verified experimentally for each specific formulation system.
Q5: What are key handling considerations for storage and shelf life?
A: Store in a cool, dry environment away from direct moisture and humidity; when kept sealed under recommended conditions, it maintains consistent performance over extended periods, with no defined expiration date under proper handling.
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