High acid value polyester
AssigneePPG Industries Ohio, Inc.
InventorsPaul Hubert Lamers, Christopher A. Verardi, Wei Wang
Life of this patent
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Abstract
A coating composition includes (a) a melamine resin having imino and methylol functional groups that together include 30 mole % or greater of the total functionality of the melamine resin; and (b) at least one polymer reactive with (a) that is obtained from components including polytetrahydrofuran and a carboxylic acid or anhydride thereof. The polytetrahydrofuran includes greater than 20 weight % of the components that form the polymer (b) and the carboxylic acid or anhydride thereof includes greater than 13 weight % of the components that form the polymer (b). The polymer (b) has an acid value ranging from 40 to 60 based on the total resin solids of the polymer (b).
Claims25
A coating composition comprising:
- (a) a melamine resin comprising imino and methylol functional groups that together comprise 30 mole % or greater of the total functionality of the melamine resin;
- and
- (b) at least one polymer reactive with (a) that is obtained from components comprising polytetrahydrofuran and a carboxylic acid or anhydride thereof,
- wherein the polytetrahydrofuran comprises greater than 20 weight % of the components that form the polymer (b) and the carboxylic acid or anhydride thereof comprises greater than 18.5 weight % of the components that form the polymer (b), and
- wherein the polymer (b) has an acid value ranging from 45 to 60 based on the total resin solids of the polymer (b) if it does not comprise core-shell particles;
- or
- wherein the polymer (b) reactive with the melamine resin (a) comprises polymeric core-shell particles, wherein at least a portion of a polymeric shell of the core-shell particles is covalently bonded to at least a portion of a polymeric core of the core-shell particles, and
- wherein the polymer shell of the core-shell particles is obtained from components comprising greater than 20 weight % of the components that form the polymeric shell of polytetrahydrofuran and greater than 18.5 weight % of the components that form the polymeric shell of carboxylic acid or anhydride thereof and in which the polymeric shell has an acid value ranging from 45 to 60 based on the total resin solids of the polymer that forms the polymeric shell.
Dependencies are inferred from the claim text.