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US 10,472,538 B2Granted
Flexible container coating compositions
AssigneePPG Industries Ohio, Inc.
InventorsHuy Lai, Kris M. Kazik, Keri Veres
Life of this patent
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Abstract
A coating composition comprising (i) a reaction product of two different polyesters, a trimellitic polyanhydride, and a curing agent, for example, an aminoplast; and (ii) an epoxidized polybutadiene polymer. The compositions are useful in coating food and beverage containers, particularly 2-piece cans formed by drawing and redrawing (DRD).
Claims3
A coating composition comprising:
- (i) a reaction product produced from a reaction mixture consisting of:
- a) a first active hydrogen-containing polyester having a number average molecular weight of at least 15,000, an acid value below 5 and a hydroxyl value below 10;
- b) a second active hydrogen-containing polyester different from the first active hydrogen-containing polyester and having a number average molecular weight of at least 20,000, an acid value below 2 and a hydroxyl value below 10;
- c) 0.1 to 10 percent by weight of a polyanhydride having the following structural formula:
- where m=2 to 4 and X is a divalent, trivalent or tetravalent organic group including mixed groups;
- and
- d) 5 to 30 percent by weight of a curing agent reactive with the active hydrogens associated with (a) and (b);
- and
- (ii) an epoxidized polybutadiene polymer;
- the percentages being based on weight of resin solids of the coating composition.
7 more elements
Dependencies are inferred from the claim text.