Modified polyvinyl alcohol polymer, water-soluble film, water-soluble fiber, and barrier packaging material

JPWO2025009505A1Pending Publication Date: 2025-01-09
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Patent Information

Application Number
JP2025531545
Authority / Receiving Office
JP · JP
Patent Type
Applications
Priority Date
2024-01-12
Filing Date
2024-07-01
Publication Date
2025-01-09

AI Technical Summary

Technical Problem

Existing polyvinyl alcohol polymers face challenges with viscosity stability in aqueous solutions at low temperatures, foaming issues, and reduced solvent resistance, which affect their handling and film properties, particularly under high humidity.

Method used

A modified polyvinyl alcohol polymer with a structural unit represented by formula (1), having a 1,3-diol structure, is developed using 2-methylene-1,3-propanediol diacetate, allowing for improved solvent resistance and stability through controlled copolymerization and saponification, resulting in a polymer with enhanced solubility and film strength.

Benefits of technology

The modified polymer exhibits improved solvent resistance, stability in cold water, and maintains film strength under high humidity, addressing the limitations of previous polymers and enabling its use in water-soluble films, fibers, and barrier packaging materials.

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Abstract

This modified polyvinyl alcohol polymer has a vinyl alcohol unit and a structural unit represented by formula (1). The distribution of the modification rate of the structural unit represented by (1) with respect to 100 mol% of all structural units in the modified polyvinyl alcohol polymer is 0.5 mol% or less.
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