Coating composition for a food or beverage can

Patent metadata

Field	Value
Publication number	US-9718983-B2
Application number	US-201514843273-A
Country	US
Kind code	B2
Filing date	Sep 2, 2015
Priority date	May 30, 2014
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A two component coating composition, suitable for coating onto a metal substrate, especially food and beverage cans, the coating composition comprising:
a first component comprising an acrylic latex material; and a second component comprising a functional silane material.

First claim

The invention claimed is:

1. A two component coating composition suitable for coating onto a metal substrate, the coating composition comprising:
a first component comprising an acrylic latex material; and
a second component comprising a functional silane material;
wherein the acrylic latex material comprises an alkyl (meth)acrylate which comprises epoxy functionality.

2. The coating composition of claim 1 , wherein the acrylic latex material comprises an aqueous emulsion of one or more acrylic polymers.

3. The coating composition of claim 1 , wherein the acrylic latex material comprises an aqueous dispersion of an acrylic material in a core/shell arrangement.

4. The coating composition of claim 3 , wherein the core is formed from a core mixture and the shell is formed from a shell mixture, and wherein the ratio of the core mixture (monomers and initiator) to shell mixture (monomers and initiator) is between about 20:80 and 90:10 by weight.

5. The coating composition of claim 1 , wherein the latex material comprises an aqueous dispersion of an acrylic material with reactive functional groups and stabilized with an emulsifier or surfactant material.

6. The coating composition of claim 1 , wherein the functional silane material comprises a silane material according to Formula I, or a polysiloxane polymer derived from one or more silane material according to Formula I:
(R 1 ) n Si(OR 2 ) m   I

wherein each R 1 is independently selected from an epoxy functional optionally substituted alkyl group,
each R 2 independently represents H or an alkyl group
n=1 to 3,
m=1 to 3; and
n+m=4.

7. The coating composition of claim 1 , wherein the functional silane material comprises a silane material according to Formula 2, or a polysiloxane polymer derived from one or more silane material according to Formula 2:
((R 3 )HN(CH 2 ) 3 ) n Si(OR 4 ) m   2

wherein each R 3 is independently selected from H or an optionally substituted alkyl group,
each R 4 independently represents H or an alkyl group
n=1 to 3,
m=1 to 3; and
n+m=4.

8. The coating composition of claim 1 , wherein the functional silane material comprises an epoxy functional silane or an amino functional silane.

9. The coating composition of claim 1 , wherein the coating composition comprises the acrylic latex material and the functional silane material in a ratio of latex solids to silane solids of between about 99:1 parts by wt to 1:99 parts by wt.

10. The coating composition of claim 1 , wherein the functional silane material reduces the curing time in a two component coating composition as compared to a coating lacking the functional silane material.

11. The coating composition of claim 1 , wherein the functional silane material reduces the curing temperature in a two component coating composition as compared to a coating lacking the functional silane material.

12. The coating composition of claim 1 , wherein the alkyl (meth)acrylate comprises glycidyl methacrylate.

13. The coating composition of claim 6 , wherein the functional silane material comprises γ-glycidyloxypropyl trialkoxysilane.

14. The coating composition of claim 7 , wherein the functional silane material comprises γ-aminopropyl trialkoxysilane.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Lock Kam
• Ducrocq Laudine
• Maral Jean-Luc
• Smets Gregory

Classifications

• C09D151/06

  grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond · CPC title

• C09D133/068

  containing glycidyl groups · CPC title

• C09D133/02 Primary

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

• C08L83/04

  Polysiloxanes · CPC title