Coating composition for in-mold coating and coated article

The coating composition for in-mold painting, featuring a combination of alicyclic and styrene block copolymers, addresses the challenge of adhesion to non-polar resin substrates by enhancing compatibility and adhesion properties, resulting in improved performance at low temperatures.

WO2025057464A1 Publication Date: 2025-03-20NIPPON PAINT AUTOMOTIVE COATINGS
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Patent Information

Application Number
PCT/JP2024/013616
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-13
Filing Date
2024-04-02
Publication Date
2025-03-20

AI Technical Summary

Technical Problem

Existing coating compositions for in-mold painting struggle with adhesion to low-temperature curable and non-polar resin substrates, such as polypropylene, due to compatibility issues and increased viscosity.

Method used

A coating composition comprising a first compound with an alicyclic skeleton and one reactive double bond, a second compound capable of copolymerization, a third compound with multiple reactive double bonds, and a styrene block copolymer, which improves adhesion and compatibility with non-polar substrates.

Benefits of technology

The coating composition achieves excellent initial adhesion, water-tightness, and bending resistance to non-polar substrates, even at low temperatures, while maintaining stability and preventing viscosity increases.

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Abstract

This coating composition for in-mold coating comprises: a first compound (A) having an alicyclic skeleton and one reactive double bond; a second compound (B) having one reactive double bond copolymerizable with the first compound (A); a third compound (C) having two to six reactive double bonds; a styrene block copolymer (D) having a styrene-derived styrene block and a linear or branched olefin-derived olefin block; and a polymerization initiator (E).
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