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US 10,280,332 B2Granted
Phosphatized polyesters and coating compositions containing the same
AssigneePPG Industries Ohio, Inc.
InventorsYoussef Moussa, Claudia Knotts
Life of this patent
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Abstract
A coating composition comprising a resinous binder and up to 10 percent by weight of a phosphatized polyester. The compositions are useful for coating containers of all sorts such as food and beverage containers, and the phosphatized polyester provides enhanced adhesion of the coating to the container substrate. The compositions can be formulated to be substantially free of bisphenol A (BPA) and bisphenol A diglycidyl ether (BADGE).
Claims20
A method for applying a cured coating to a food or beverage container, the method comprising:
- (a) depositing a liquid coating composition on a substrate, wherein the coating composition comprises a resinous binder, and 0.1 to 10 percent by weight of a phosphatized polyester based on weight of resin solids in the coating composition, wherein the phosphatized polyester comprises a reaction product comprising:
- (A) a polyester having an Mn of 2,000 to 10,000, a hydroxyl number of 20 to 75, and an acid value of 15 to 25, wherein the polyester comprises a polycondensate of:
- (I) a polyol component comprising a mixture of diols and triols, and
- (II) a polyacid component comprising an alpha, beta-ethylenically unsaturated polycarboxylic acid, and
- (B) a phosphorus acid;
- wherein the coating composition is dissolved or dispersed in a diluent;
- and
- (b) heating the substrate with the deposited coating composition to a temperature and for a time sufficient to evaporate the diluent from the coating composition and to cure the coating composition.
5 more elements
A method for coating a substrate, the method comprising:
- (a) depositing a liquid coating composition on a substrate, wherein the coating composition comprises a resinous binder, and 0.1 to 10 percent by weight of a phosphatized polyester based on weight of resin solids in the coating composition, wherein the phosphatized polyester comprises a reaction product comprising:
- (A) a polyester having an Mn of 2,000 to 10,000, a hydroxyl number of 20 to 75, and an acid value of 15 to 25, wherein the polyester comprises a polycondensate of:
- (I) a polyol component comprising a mixture of diols and triols provided as a weight ratio of 0.5:1 to 10:1 diol:triol, and
- (II) a polyacid component comprising an alpha, beta-ethylenically unsaturated polycarboxylic acid, and
- (B) a phosphorus acid provided in amounts of 0.2-0.5 equivalents phosphorous acid per hydroxyl equivalent of the polyester;
- wherein the coating composition is dissolved or dispersed in a diluent;
- and
- (b) heating the substrate with the deposited coating composition to a temperature and for a time sufficient to evaporate the diluent from the coating composition and to cure the coating composition.
5 more elements
Dependencies are inferred from the claim text.