US 8,765,241 B2Granted

Polyester coating composition for metal substrates comprising oxirane-functional acrylic resin

AssigneeValspar Sourcing, Inc.

InventorsGirish G. Parekh, George K. Bartley, III, Greg M. Paulson, Paul E. Fuchs, Daniel E. Rardon, Robert M. O'Brien

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Abstract

The present invention provides novel packaging articles, e.g., food and beverage cans. Preferred cans typically comprise a body portion and an end portion, wherein at least one of the body and end portions are aluminum and are coated on at least one major surface with a coating composition of the present invention. Suitable coating compositions of the present invention comprise: one or more polyester resins, wherein at least one of the polyester resins has a glass transition temperature (“Tg”) less than about 50° C., and wherein the polyester resin is formed by the reaction of one or more polyacid molecules and one or more polyol molecules; and a crosslinker. The present invention also provides a method of making such cans.

Claims23

Dependent claims

An article, comprising:

a metal beverage can having a body portion and an end portion, wherein the end portion is an aluminum beverage can end coated on an interior surface with a coating obtained from a coating composition comprising:
between about 60 and 95 weight percent of one or more polyester resins, based on solids content of the coating composition, wherein at least one polyester resin has a Tg of less than about 50° C.;
and
an oxirane-functional acrylic resin, wherein the acrylic resin is present in an amount up to about 20% by weight of the coating composition, based upon the total resin solids in the coating composition;
wherein the coating composition is substantially free of mobile BPA and aromatic glycidyl ether compounds;
and
wherein the coating on the interior surface of the beverage can end passes less than 10 milliamps of current while being exposed for 4 seconds to an electrolyte solution containing 1% by weight of NaCl dissolved in deionized water.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/540,332Filed 2 Jul 2012 · continuation
Priority: 1 Aug 2002
Published: US 2012/0135151 A120 Dec 2012
Granted: 1 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification34 codes

C09D 167/00
Coating compositions based on polyesters obtained by reactions forming a carboxylic ester
B21D 51/26
Characterised by the use of the objects: cans or tins; Closing same in a permanent manner
B65B 3/027
Machines characterised by the incorporation of means for making the containers or receptacles: making containers from separate body and end-parts
C08G 18/4202
Polycondensates having carboxylic or carbonic ester groups in the main chain: two or more polyesters of different physical or chemical nature

Family

Application60/400,091Us provisional application · filed 1 Aug 2002
PCT/US03/04090Parent of this continuation · filed 1 Aug 2003
Application13/358,313Parent of this continuation · filed 25 Jan 2012
US 8,133,557 B2Parent of this continuation · filed 13 Mar 2012
US 2012/0318699 A1Pre-grant publication · published 20 Dec 2012
US 8,231,951 B2Parent of this continuation
Application10/522,428Parent of this continuation
US 2006/0093768 A1Published application
US 2012/0135151 A1Published application
US 8,765,241 B2This patent

From the US filing history. Foreign family members aren’t listed.