High solids content coating composition and method for forming multi-layer coating film

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A high solids coating composition with a specific resin blend and application process enhances hardness and scratch resistance while achieving a desirable finish, overcoming limitations in existing topcoat paints.

JP7776423B2Active Publication Date: 2025-11-26KANSAI PAINT CO LTD

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Patent Information

Application Number: JP2022541587
Authority / Receiving Office: JP · JP
Patent Type: Patents
Current Assignee / Owner
Priority Date: 2020-08-04
Filing Date: 2021-08-04
Publication Date: 2025-11-26
Estimated Expiration: 2041-08-04

Application Information

Patent Timeline

04 Aug 2020

Priority

04 Aug 2021

Application

JP2022541587

26 Nov 2025

Publication

JP7776423B2

IPC: C09D133/14; C09D175/04; C09D167/00; C09D161/28; B05D1/36; B05D7/24

CPC: C09D133/14; B05D2350/60; B05D2350/10; B05D2202/10; B05D2401/20; B05D7/572; B05D2425/01; B05D3/0254

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Application Domain

Pretreated surfaces Polyurea/polyurethane coatings

Technology Topics

Coated membrane Solid content

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AI Technical Summary

Technical Problem

Existing high solids coating compositions either lack sufficient scratch resistance or hardness, or they fail to achieve a desirable finished appearance, as seen in solvent-based and water-based topcoat paints.

Method used

A high solids coating composition comprising a hydroxyl group- and alkoxysilyl group-containing acrylic resin, a hydroxyl group-containing polyester resin, and a polyisocyanate compound, with specific ratios and properties, applied in a multi-layer coating process to form a film.

Benefits of technology

The composition forms a coating film that is excellent in hardness, scratch resistance, and finished appearance, addressing the shortcomings of previous compositions.

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Abstract

The present invention relates to a coating composition with a high solids content that includes: (A) a hydroxyl group- and alkoxysilyl group-including acrylic resin; (B) a hydroxyl group-including polyester resin; and (C) a polyisocyanate compound, wherein the acrylic resin (A) content is 20-50 parts by mass per 100 parts by mass of the resin solids content of the coating composition with a high solids content, the polyester resin (B) has an acid number of 10 mg KOH / g or less, a hydroxyl number of 180-300 mg KOH / g, and a number average molecular weight of 400-1500, and at the time of coating, the solids content of the coating composition with a high solids content is 50 mass% or greater.

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