Hydroxy-functional polyester diluents as additives in coating compositions
First Claim
1. An acrylic-modified hydroxy-functional polyester diluent obtained from the reaction ofI. 50 to 100 parts by weight of a hydroxy-functional polyester reactive diluent having a number average molecular weight less than 500 derived from the reaction of from about(a) 40 to 60 parts by weight of at least one triol having a molecular weight less than about 200,(b) 10 to 30 parts by weight of an unsaturated monocarboxylic acid having the formula:
- ##STR4## wherein R1 is either hydrogen or an alkyl group of 1 to 3 carbon atoms and R2 is an aliphatic group of 1 to 4 carbon atoms or an aryl group,(c) 10 to 30 parts by weight of a saturated monocarboxylic acid having the formula;
space="preserve" listing-type="equation">R--COOH wherein R is hydrogen or a branched alkyl or straight chain alkyl of 1 to 6 carbon atoms, and(d) 0 to 15 parts by weight of a benzoic acid;
withII. 1 to 50 parts by weight of at least one acrylic monomer copolymerizable with said hydroxy-functional polyester diluent.
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Abstract
This invention relates to novel hydroxy-functional polyester diluents, and more particularly, to acrylic-modified hydroxy-functional polyester reactive diluents useful for blending with a variety of thermosetting or thermoplastic film-forming polymers. More specifically, the hydroxy-functional polyester reactive diluents are essentially low molecular weight polyesters derived from triols, and a combination of unsaturated monocarboxylic acids and saturated monocarboxylic acids. These hydroxy-functional polyester diluents may be copolymerized with one or more acrylic monomers, i.e. hydroxy-functional acrylic monomers, and blended with a variety of thermosetting or thermoplastic film-forming polymers. These blends of the film-forming polymers and the hydroxy-functional polyester diluents can be crosslinked with conventional crosslinking agents such as isocyanates and used in the formulation of low VOC paint compositions particularly useful as automotive topcoats.
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Citations
2 Claims
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1. An acrylic-modified hydroxy-functional polyester diluent obtained from the reaction of
I. 50 to 100 parts by weight of a hydroxy-functional polyester reactive diluent having a number average molecular weight less than 500 derived from the reaction of from about (a) 40 to 60 parts by weight of at least one triol having a molecular weight less than about 200, (b) 10 to 30 parts by weight of an unsaturated monocarboxylic acid having the formula: - ##STR4## wherein R1 is either hydrogen or an alkyl group of 1 to 3 carbon atoms and R2 is an aliphatic group of 1 to 4 carbon atoms or an aryl group,
(c) 10 to 30 parts by weight of a saturated monocarboxylic acid having the formula;
space="preserve" listing-type="equation">R--COOHwherein R is hydrogen or a branched alkyl or straight chain alkyl of 1 to 6 carbon atoms, and (d) 0 to 15 parts by weight of a benzoic acid;
withII. 1 to 50 parts by weight of at least one acrylic monomer copolymerizable with said hydroxy-functional polyester diluent. - View Dependent Claims (2)
- ##STR4## wherein R1 is either hydrogen or an alkyl group of 1 to 3 carbon atoms and R2 is an aliphatic group of 1 to 4 carbon atoms or an aryl group,
Specification