Acrylic Resins and Powder Coating Compositions and Powder Coated Substrates Including the Same

Patent metadata

Field	Value
Publication number	US-2016355626-A1
Application number	US-201515121681-A
Country	US
Kind code	A1
Filing date	Feb 25, 2015
Priority date	Feb 27, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

An epoxy functional acrylic resin having a T g of greater than 85° C. and a calculated solubility parameter from about 9.20 to about 9.30 (cal/cm 3 ) 1/2 , powder coating compositions including the same and coated substrates coated with the powder coating composition is described. The resin includes, as copolymerized monomers, from about 10 wt. % to about 40 wt. % of one or more epoxy functional unsaturated monomers; from about 10 wt. % to about 20 wt. % of one or more hydrophobic acrylic monomers, and from greater than 50 wt. % to about 75 wt. % of at least one nonionic copolymer that is different from the hydrophobic acrylic monomers ii), each monomer wt. % based on the total weight of copolymerized monomers in the resin.

First claim

1 . An epoxy functional acrylic resin comprising, as copolymerized monomers:
i) from about 10 wt. % to about 40 wt. % of one or more epoxy functional unsaturated monomers; ii) from about 10 wt. % to about 20 wt. % of one or more hydrophobic acrylic monomers, and iii) from greater than 50 wt. % to about 75 wt. % of at least one nonionic copolymer that is different from the hydrophobic acrylic monomers ii),  each monomer wt. % based on the total weight of copolymerized monomers in the resin; wherein the resin has a T g of greater than 85 degrees Celsius; and wherein the resin has a calculated solubility parameter from about 9.20 to about 9.30 (cal/cm 3 ) 1/2 .

2 . The epoxy functional acrylic resin of claim 1 , wherein the one or more hydrophobic acrylic monomers ii) has a mass solubility in water of 3.5 g/L or less and which would itself form a homopolymer having a glass transition temperature (T g ) of about 50 degrees Celsius to about 175 degrees Celsius.

3 . The epoxy functional acrylic resin of claim 1 , wherein the one or more hydrophobic acrylic monomers ii) is a bicycloalkyl (meth)acrylate.

4 . The epoxy functional acrylic resin of claim 3 , wherein the bicycloalkyl (meth) acrylate is isobornyl (meth)acrylate.

5 . The epoxy functional acrylic resin of claim 1 , wherein the one or more hydrophobic acrylic monomers is present in an amount from about 14 wt. % to about 20 wt. %.

6 . The epoxy functional acrylic resin of claim 1 , wherein the at least one copolymerized monomer iii) is a C 1 to C 8 (cyclo)alkyl ester of (meth)acrylic acid.

7 . The epoxy functional acrylic resin of claim 5 , wherein the at least one nonionic copolymer iii) is butyl (meth)acrylate or methyl methacrylate.

8 . The epoxy functional acrylic resin of claim 1 , further comprising about 0.5 wt. % to about 12 wt. % of a vinyl aromatic monomer iv), based on the total weight of copolymerized monomers in the epoxy functional acrylic resin.

9 . The epoxy functional acrylic resin of claim 7 wherein the vinyl aromatic monomer iv) is styrene.

10 . The epoxy functional acrylic resin of claim 1 wherein the resin has a T g of about 90 degrees Celsius to about 95 degrees Celsius.

11 . A powder coating composition comprising:
the epoxy functional acrylic resin of claim 1 ; and one or more crosslinkers for the resin.

12 . The powder coating composition of claim 9 , wherein the one or more crosslinkers is an organic dicarboxylic acid or anhydride, or an adduct thereof with a polyester or a polyisocyanate.

13 . The powder coating composition of claim 9 , further comprising one or more adjuvants selected from the group consisting of a hydrophobic submicron particle, an adhesion promoter, a light stabilizer, an ultraviolet (UV) absorber and a combination thereof.

14 . A coated substrate coated with a powder coating composition, said powder coating composition comprising:
the epoxy functional acrylic resin of claim 1 ; and one or more crosslinkers for the resin.

15 . The coated substrate of claim 14 , wherein the substrate is aluminum or a forged alloy.

Assignees

• Akzo Nobel Coatings Int Bv

Inventors

• Larson Gary Robert
• Wilhelm Justin E
• Cinoman Douglas Samuel

Classifications

• C09D5/08

  Anti-corrosive paints · CPC title

• C08L33/068 Primary

  containing glycidyl groups · CPC title

• C09D133/14

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• C08F220/325

  containing glycidyl radical, e.g. glycidyl (meth)acrylate · CPC title

• C09D5/03

  Powdery paints · CPC title