Coating compositions with improved adhesion to containers

Patent metadata

Field	Value
Publication number	US-9670378-B2
Application number	US-201113113126-A
Country	US
Kind code	B2
Filing date	May 23, 2011
Priority date	May 23, 2011
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

A coating composition comprising a resinous binder and up to 10 percent by weight of the reaction product of (i) a phosphorus acid, and (ii) a polyglycidyl ether of cyclohexane dimethanol. The compositions are useful for coating containers of all sorts, such as food and beverage containers, and the reaction product provides enhanced adhesion of the coating to the substrate. The compositions can be formulated to be substantially free of bisphenol A (BPA) and derivatives thereof such as bisphenol A diglycidyl ether (BADGE).

First claim

The invention claimed is:

1. A coating composition comprising:
(a) a resinous binder comprising:
(i) an acrylic polymer having reactive functional groups,
(ii) an aminoplast crosslinker having functional groups reactive with the functional groups of (i),

(b) 0.5 to 5 percent by weight based on weight of resin solids in the coating composition of a reaction product comprising:
(i) phosphoric acid, and
(ii) cyclohexane dimethanol diglycidyl ether.

2. The coating composition of claim 1 in which the acrylic polymer is present in amounts of 40 to 90 percent by weight; the crosslinking agent is present in amounts of 5 to 50 percent by weight; the percentages by weight being based on total weight of resin solids in the composition.

3. The coating composition of claim 1 in which the phosphoric acid is used in amounts of 0.2 to 0.5 equivalents per equivalent of oxirane.

4. A coated article comprising:
(a) a substrate, and
(b) a coating deposited on at least a portion thereon from the composition of claim 1 .

5. The coated article of claim 4 in which the substrate is a container.

6. The coated article of claim 5 in which the substrate is a can for food or beverage.

7. The coated article of claim 4 in which the coating is deposited on the exterior of the container.

8. The coated article of claim 7 in which the coating is a cured thermoset composition.

Assignees

• Moussa Youssef
• Knotts Claudia
• List Michael
• Ppg Ind Ohio Inc

Inventors

• Moussa Youssef
• Knotts Claudia
• List Michael

Classifications

• C08L63/00

  Compositions of epoxy resins; Compositions of derivatives of epoxy resins · CPC title

• C09D167/00 Primary

  Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• Y10T428/1352

  Polymer or resin containing [i.e., natural or synthetic] · CPC title

• C09D133/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• C08G59/304

  containing phosphorus · CPC title