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US 10,836,929 B2Granted
Polyester polymers comprising lignin
AssigneePPG Industries Ohio, Inc.
InventorsMark Paul Bowman, Carole A. Conley, Irina G. Schwendeman, Mercy M. Hibbert
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Abstract
Disclosed is a polyester polymer prepared from a reaction mixture comprising a polyacid component and a polyol component that comprises lignin. Residues of lignin are incorporated into the backbone of the polyester polymer. Coatings comprising the same and substrates coated at least in part with such coatings are also disclosed.
Claims10
A method of protecting a metal substrate from corrosion comprising:
- (i) applying a coating composition over at least a portion of a substrate comprising metal, the coating composition comprising a mixture of reactants comprising:
- (a) a polycarboxylic acid component;
- and
- (b) a polyol component consisting essentially of:
- (1) a lignin component consisting essentially of wheat straw lignin, and
- (2) at least one other hydroxyl functional component not including lignin,
- such that residues of the wheat straw lignin are incorporated into the coating composition,
- wherein the polycarboxylic acid component and the hydroxyl functional component not including lignin react to form a polyester,
- wherein the wheat straw lignin is incorporated into the backbone of the polyester,
- wherein the polyester contains from 10 to 20 weight % wheat straw lignin incorporated in the backbone based on total solids and the coating composition optionally comprises 0 to 20 weight % of wheat straw lignin as filler based on total solids;
- and
- (ii) curing the coating composition to form a thermoset polyester coating.
9 more elements
Dependencies are inferred from the claim text.