Container coating compositions
First Claim
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1. A coated article comprising:
- (a) a metal container for food or beverages,(b) a cured coating applied to the interior surface of the container, the cured coating being derived from a liquid coating composition, wherein the coating composition is substantially free of bisphenol A and derivatives thereof, comprising;
(A) 70 to 90 percent by weight of a hydroxyl functional polyester resin prepared from;
(i) 1 to 8 mole percent of an alpha, beta-ethylenically unsaturated dicarboxylic acid containing from 4 to 5 carbon atoms,(ii) 10 to 30 mole percent of naphthalene dicarboxylic acid including lower alkyl esters thereof,(iii) 10 to 30 mole percent of an aromatic dicarboxylic acid different from (ii),(iv) 40 to 60 mole percent of an aliphatic diol containing branched alkyl groups, is free of neopentyl glycol, and(v) 0.2 to 4 mole percent of a triol,the mole percentages being based on total moles of (i)-(v);
(B) 5 to 25 percent by weight of an aminoplast curing agent,(C) 0.1 to 20 percent by weight of a phosphatized polyester,(A), (B), and (C) being dissolved in organic solvent;
the percentages by weight of (A), (B) and (C) being based on weight of resin solids in the coating composition and wherein the cured coating has a WACO Enamel Rater value less than 10 when tested according to the L-85 protocol.
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Abstract
A coating composition comprising a polyester resin binder and a phosphatized polyester. The compositions are useful for coating containers such as food and beverage containers. The compositions have excellent hydrolytic stability upon storage at high temperature. The compositions are formulated to be substantially free of bisphenol A (BPA) and bisphenol A diglycidyl ether (BADGE).
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Citations
18 Claims
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1. A coated article comprising:
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(a) a metal container for food or beverages, (b) a cured coating applied to the interior surface of the container, the cured coating being derived from a liquid coating composition, wherein the coating composition is substantially free of bisphenol A and derivatives thereof, comprising; (A) 70 to 90 percent by weight of a hydroxyl functional polyester resin prepared from; (i) 1 to 8 mole percent of an alpha, beta-ethylenically unsaturated dicarboxylic acid containing from 4 to 5 carbon atoms, (ii) 10 to 30 mole percent of naphthalene dicarboxylic acid including lower alkyl esters thereof, (iii) 10 to 30 mole percent of an aromatic dicarboxylic acid different from (ii), (iv) 40 to 60 mole percent of an aliphatic diol containing branched alkyl groups, is free of neopentyl glycol, and (v) 0.2 to 4 mole percent of a triol, the mole percentages being based on total moles of (i)-(v); (B) 5 to 25 percent by weight of an aminoplast curing agent, (C) 0.1 to 20 percent by weight of a phosphatized polyester, (A), (B), and (C) being dissolved in organic solvent;
the percentages by weight of (A), (B) and (C) being based on weight of resin solids in the coating composition and wherein the cured coating has a WACO Enamel Rater value less than 10 when tested according to the L-85 protocol.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification