Fluorine-containing copolymer, varnish and paint composition using the same

A fluorine-containing copolymer with controlled molecular weight and specific monomer units addresses the challenge of achieving high concentration, low viscosity, and high hardness in coating films, ensuring excellent compatibility and weather resistance.

JP2026062580APending Publication Date: 2026-04-09DAIKIN INDUSTRIES LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-09-30
Publication Date
2026-04-09

AI Technical Summary

Technical Problem

Existing fluorine-containing copolymers face challenges in achieving high concentration and low viscosity while maintaining excellent compatibility, weather resistance, and high hardness in coating films, particularly when pigments are included.

Method used

A fluorine-containing copolymer with controlled molecular weight characteristics, comprising specific monomer units and a number-average molecular weight of 4,000 to 10,000 and a molecular weight distribution of 2.2 or less, which enhances reactivity during crosslinking to achieve high concentration, low viscosity, and improved film properties.

Benefits of technology

The copolymer achieves high concentration and low viscosity, enabling the formation of highly hard coating films with maintained compatibility and weather resistance, suitable for use in paint compositions.

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Abstract

The present invention provides a fluorine-containing copolymer suitable for use as a paint, as well as a varnish and paint composition using the same. [Solution] A fluorine-containing copolymer comprising (a) a fluoroolefin structural unit having 2 carbon atoms, (b) a non-aromatic vinyl ester monomer and / or vinyl ether monomer structural unit that does not contain hydroxyl groups and carboxyl groups, and (c) a hydroxyl group-containing vinyl monomer structural unit that does not contain aromatic groups and carboxyl groups, wherein the number average molecular weight is 4,000 to 10,000 and the molecular weight distribution is 2.2 or less.
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Citation Information

Patent Citations

  • Fluorine-containing copolymer and its production

    JP1991146510A

  • Fluorine-containing copolymer and coating composition

    JP2004204205A

  • A curable fluoropolymer formed from tetrafluoropropene

    JP2016539214A

  • 2, 3, 3, 3- tetrafluoropropene homopolymer

    WO2011122661A1