HASE rheology modifier VAE emulsion copolymer composition

Patent metadata

Field	Value
Publication number	US-9340685-B2
Application number	US-201414501483-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2013
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

The present invention relates to a composition comprising a vinyl acetate copolymer and a HASE thickener comprising structural units of ethyl acrylate, methacrylic acid, acrylic acid, and a hydrophobic macromonomer. The composition of the present invention shows an improvement in heat aged stability over a vinyl acetate copolymer based paint thickened with a HASE that does not include structural units of acrylic acid.

First claim

The invention claimed is:

1. A composition comprising an aqueous dispersion of a) a vinyl acetate copolymer having a T g in the range of −10° C. to 50° C. and b) a hydrophobically modified alkali soluble emulsion (HASE) comprising, based on the weight of the HASE: i) from 45 to 60 weight percent structural units of ethyl acrylate; ii) from 30 to 45 weight percent structural units of methacrylic acid; iii) from 2.0 to 20 weight percent structural units of acrylic acid; iv) from 0.1 to 5 weight percent structural units of a sulfonic acid monomer or a salt thereof; and v) from 0.1 to 10 weight percent structural units of hydrophobic macromolecular groups represented by either of the following structures:
R a —(OR b ) x —(OR c ) y —OC(O)—CR d ═CH 2

or
R a —(OR b ) x —(OR c ) y —OC(O)—NH—C(CH 3 ) 2 -(Ph)-CR d ═CH 2

where R a is a C 8 -C 24 alkyl or aralkyl group; x+y is 10 to 100; R b and R c are each independently CH 2 CH 2 , CH 2 CH(CH 3 ), or CH 2 CH 2 CH 2 CH 2 ; R d is H or C 1 -C 6 -alkyl; and Ph is a phenylene group.

2. The composition of claim 1 wherein the vinyl acetate copolymer is a VAE copolymer, and wherein the HASE comprises from 2 to 15 weight percent structural units of acrylic acid, from 0.1 to 2 weight percent structural units of a sulfonic acid monomer or a salt thereof, and a total acid content of 40 to 48 weight percent, based on the weight of the HASE.

3. The composition of claim 2 wherein the HASE comprises, based on the weight of the HASE, from 45 to 56 weight percent structural units of ethyl acrylate and from 4 to 11 weight percent structural units of acrylic acid.

4. The composition of claim 3 wherein the HASE comprises from 50 to 55 weight percent structural units of ethyl acrylate and from 8 to 11 weight percent structural units of acrylic acid, each based on the weight of the HASE, wherein the sulfonic acid monomer is 2-(meth)acrylamido-2-methyl propanesulfonic acid or a salt thereof.

5. The composition of claim 4 wherein the total acid content is from 43 to 46 weight percent, based on the weight of the HASE.

6. The composition of claim 1 wherein the hydrophobic macromolecular groups are structural units of either or both of following macromonomers:
R a —(OCH 2 CH 2 ) (z) —OC(O)—C(CH 3 )═CH 2

or
R a —(OCH 2 CH 2 ) (z) —OC(O)—NH—C(CH 3 ) 2 -(Ph)-C(CH 3 )═CH 2

where R a is a C 8 -C 24 alkyl or aralkyl group; z is 10 to 50; and Ph is a phenylene group.

7. The composition of claim 1 which further includes one or more of the following components: pigments; fillers; dispersants; defoamers; surfactants; biocides; extenders; bases; a non-vinyl acetate containing binder; or colorants.

Assignees

• Rohm & Haas

Inventors

• Carchidi Matthew J
• Rabasco John J
• Unangst Jaclynn
• Van Dyk Antony K

Classifications

• C08F220/18

  with acrylic or methacrylic acids · CPC title

• C09D7/43

  Thickening agents · CPC title

• C09D133/064

  containing anhydride, COOH or COOM groups, with M being metal or onium-cation · CPC title

• C09D131/04 Primary

  Homopolymers or copolymers of vinyl acetate · CPC title

• C08L2201/54

  Aqueous solutions or dispersions · CPC title