Clearcoat compositions comprising branched polyesters in additive amounts as flow enhancers and levelling agents

The clearcoat coating composition with a branched OH-functional polyester and crosslinking agent addresses the challenge of high solids-content and spray ability under varying environmental conditions, ensuring excellent coating appearance and durability.

AU2020418546B2Pending Publication Date: 2026-07-23BASF COATINGS GMBH
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Patent Information

Application Number
AU2020418546
Authority / Receiving Office
AU · AU
Patent Type
Applications
Current Assignee / Owner
Priority Date
2019-12-30
Filing Date
2020-12-30
Publication Date
2026-07-23
Estimated Expiration
2040-12-30

AI Technical Summary

Technical Problem

Existing clearcoat coating compositions face challenges in achieving high solids-content while maintaining excellent spray ability and minimizing die-back defects under varying environmental conditions, particularly high temperatures and humidity, without increasing VOC content.

Method used

A clearcoat coating composition comprising an OH-functional (meth)acrylic copolymer, a branched OH-functional polyester, and a crosslinking agent, where the branched OH-functional polyester is present in 1.0 wt.-% to 15.0 wt.-%, enhancing spray ability and leveling properties, and ensuring hydrolytic stability for durable coatings.

Benefits of technology

The composition achieves excellent spray ability and minimized die-back defects even in high humidity and temperature conditions, with improved durability and DOI values, while maintaining a high solids-content without increasing VOCs.

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Abstract

The present invention relates to a clearcoat coating material composition comprising an OH-functional (meth)acrylic copolymer (A1), a branched OH-functional polyester (A2) in an amount in the range of from 1.0 wt.-% to 15.0 wt.-%, based on the total solids content of the coating material composition, which is obtainable by performing steps (a), (b) and (c), and at least one crosslinking agent (B1), which is different from both constituents (A1) and (A2) and which contains crosslinkable functional groups, which can be crosslinked with OH-functional groups, a method of coating a substrate including a step of applying to an optionally pre-coated substrate the inventive clearcoat coating material composition, a coated substrate, which is obtainable by the inventive method, and a use of the branched OH-functional polyester (A2) as flow enhancer in a clearcoat coating material application for spray applying said clearcoat coating material application onto an optionally pre-coated substrate and / or as levelling agent.
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