Thermosetting Coating Composition with TMCD Polyester for Scratch Resistance
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Solution Overview
Problem
Existing thermosetting coating compositions face challenges in achieving a balance of improved tree resin resistance and scratch resistance, particularly due to the use of low molecular weight polymers to reduce VOC and increase coating solids, which adversely impact scratch resistance.
Innovation Solution
A thermosetting coating composition comprising a polyester polyol made from 2,4,4-tetraalkylcyclobutane-1,3-diol (TACD) and an alicyclic diacid in specific ratios, combined with a crosslinker, to enhance tree resin resistance and scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low molecular weight polymers are used to reduce VOC and increase coating solids, then environmental compliance is improved, but scratch resistance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the polyester polyol by incorporating TACD diol and specific diacid combinations, achieving optimal molecular weight and hydroxyl value ranges that simultaneously satisfy VOC regulations and provide adequate scratch resistance
Solution Approach 2:
The invention uses a composite polyester polyol system combining TACD diol with specific diacids (adipic, succinic, glutaric, or pimelic acid) to create a material that balances environmental compliance and mechanical performance
2Adaptability or versatility
If conventional polyester polyols without TACD or outside optimal hydroxyl value range are used, then formulation flexibility is improved, but tree resin resistance deteriorates
Solution Approach 1:
The invention establishes specific parameter ranges for TACD content (10-85 mole %) and hydroxyl value (120-350 mg KOH/g) that optimize both formulation flexibility and tree resin resistance, resolving the contradiction between these two requirements
Data Source
AI summary
This invention relates to aliphatic, carbamate-functional polyester resins for use in coatings. More particularly this invention relates to aliphatic, carbamate-functional polyester resins containing 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) that exhibit improved scratch resistance and acid etch resistance when formulated into 2K automotive clearcoats. These carbamate-functional polyesters can be used as the sole resin in the clearcoat binder or in combination with other carbamate-functional acrylic resins and/or hydroxyl-functional acrylic and polyester resins.