Kuraray Poval

Popular FAQ

1. What is Kuraray Poval™?

Kuraray Poval™ is the brand name for Kuraray's high-performance polyvinyl alcohol (PVOH / PVA) resin. It is a synthetic, water-soluble polymer known for its excellent film-forming properties, strong bonding strength, tensile strength, elasticity, and high resistance to organic solvents.

2. Where is Kuraray Poval™ manufactured and supported in North America?

Kuraray America, Inc. operates major manufacturing facilities and technical support centers in the Houston, Texas area, serving key industrial markets across North America and globally.

3. What are the key applications of Kuraray Poval™?

Kuraray Poval™ is widely used across various industries, including paper coatings, adhesives, textile sizing, building materials, ceramics, food packaging, protective colloids in emulsion polymerization, and PVC production.

4. How does degree of hydrolysis affect Kuraray Poval™ performance?

The degree of hydrolysis determines the ratio of hydroxyl to acetyl groups in the polymer chain. Fully hydrolyzed grades offer higher water resistance, tensile strength, and solvent resistance, while partially hydrolyzed grades display better cold-water solubility, flexibility, and surface activity.

5. How should Kuraray Poval™ powder be properly dissolved in water?

To prepare a solution, add Kuraray Poval™ slowly to room-temperature water while stirring continuously to prevent clumping. Gradually heat the solution to around 90°C to 95°C (194°F to 203°F) and hold at that temperature while stirring for 30 to 60 minutes until fully dissolved.

6. Is Kuraray Poval™ environmentally friendly and biodegradable?

Yes, Kuraray Poval™ is water-soluble, non-toxic, and biodegradable under specific wastewater treatment conditions by microorganisms. It produces no harmful residues when properly treated, making it a sustainable choice for many applications.

7. What is EXCEVAL™ and how does it differ from standard Kuraray Poval™?

EXCEVAL™ is a hydrophobic modified polyvinyl alcohol grade offered by Kuraray. While remaining water-soluble, it provides significantly higher water resistance and barrier performance against moisture compared to standard Kuraray Poval™ grades.

8. What specialty grades of Kuraray Poval™ are available for advanced applications?

Kuraray offers specialty products including K-Grades (reactive silanol-modified for adhesion to inorganic substrates), L-Grades and LM-Grades (used in PVC manufacturing), LV-Grades (low-methanol content for cosmetic applications), and ELVANOL™ grades.

9. How is Kuraray Poval™ used in PVC production?

In PVC suspension polymerization, specialized low-hydrolysis Kuraray Poval™ grades function as primary and secondary protective colloids, helping control PVC droplet size, particle morphology, porosity, and bulk density.

10. What role does Kuraray Poval™ play in paper and packaging applications?

In paper and packaging, Kuraray Poval™ acts as a surface sizing agent, barrier coating, and binder. It improves surface strength, smoothness, oil and grease resistance, and printing performance, making it ideal for release paper, food contact packaging, and thermal paper.

11. What is the recommended shelf life and storage condition for Kuraray Poval™?

Kuraray Poval™ has an extended shelf life when stored unopened in its original packaging under clean, dry conditions at room temperature. It should be kept away from high humidity and direct water contact to avoid moisture absorption and caking.

12. Is Kuraray Poval™ approved for food contact applications?

Select grades of Kuraray Poval™ comply with global regulations for food contact materials, including U.S. FDA regulations and European standards. Specific compliance documentation can be requested through Kuraray technical service.

13. Where can customers download Safety Data Sheets (SDS) and Technical Data Sheets (TDS)?

Official Safety Data Sheets (SDS) and Technical Data Sheets (TDS) for all Kuraray Poval™ grades are available for download directly on the official portal at poval.kuraray.com after selecting the appropriate grade and region.

14. How does Kuraray Poval™ function as a protective colloid in adhesive production?

Kuraray Poval™ is used as a primary stabilizer in the synthesis of vinyl acetate emulsion adhesives (PVAc glues). It controls emulsion viscosity, provides freeze-thaw stability, improves wet tack, and increases final bond strength.

15. How can customers request product samples or technical assistance in North America?

Customers can contact the Houston, Texas technical service team directly or submit requests for product samples, application support, and custom formulations using the contact form on the Kuraray Poval website.