Pigmented paint formulation with a phosphorus acid functionalized latex binder and an associative thickener

Patent metadata

Field	Value
Publication number	US-9745478-B2
Application number	US-201615264659-A
Country	US
Kind code	B2
Filing date	Sep 14, 2016
Priority date	Sep 17, 2015
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

The present invention relates to a composition comprising an aqueous dispersion of an associative thickener having a hydrophobic portion with a calculated log P in the range of from 2.7 to 5.0; and composite particles comprising phosphorus acid functionalized polymer particles adsorbed to the surfaces of TiO 2 particles; wherein the phosphorus acid functionalized polymer particles have a core-shell morphology wherein the core protuberates from the shell. The composition of the present invention provides formulators with flexibility in their use of low and mid shear rate thickeners to balance paint performance properties.

First claim

The invention claimed is:

1. A composition comprising an aqueous dispersion of a) from 0.02 to 2 weight percent, based on the weight of the composition, of an associative thickener having a hydrophobic portion with a calculated log P in the range of from 2.7 to 5.0; and b) from 5 to 60 weight percent, based on the weight of the composition, of composite particles comprising phosphorus acid functionalized polymer particles adsorbed to the surfaces of TiO 2 particles; wherein the volume solids content of the composition is in the range of from 30 to 44 volume percent, with the proviso that when the volume solids content is in the range of from 30 to 36 volume percent, the calculated log P of the hydrophobic portion of the associative thickener is in the range of from 4.0 to 5.0; wherein the phosphorus acid functionalized polymer particles have a core-shell morphology wherein the core protuberates from the shell.

2. The composition of claim 1 wherein the protuberating core of the phosphorus acid functionalized polymer particles comprises, based on the weight of the core: a) from 2 to 15 weight percent structural units of a phosphorus acid monomer; b) from 0.2 to 20 weight percent structural units of a carboxylic acid monomer or a salt thereof; c) from 0.1 to 30 weight percent structural units of a multiethylenically unsaturated monomer; d) from 5 to 60 weight percent structural units of methyl methacrylate or styrene or a combination thereof; and e) from 35 to 90 weight percent structural units of ethyl acrylate, butyl acrylate, or 2-ethylhexyl acrylate or a combination thereof;
wherein the shell of the phosphorus acid functionalized polymer particles comprises, based in the weight of the shell: a1) from 0.1 to 4 weight percent structural units of a sulfur acid monomer or a salt thereof; and b1) from 35 to 74.9 weight percent structural units of methyl methacrylate or styrene or a combination thereof; c1) from 25 to 64.9 weight percent structural units of butyl acrylate or ethyl acrylate or a combination thereof; and d1) less than 1 weight percent structural units of a phosphorus acid monomer or salt thereof; and
wherein the shell-core weight-to-weight ratio is in the range of 3:1 to 50:1.

3. The composition of claim 2 wherein the protuberating core of the phosphorus acid functionalized polymer particles comprises from 5 to 10 weight percent structural units of phosphoethyl methacrylate, based on the weight of the core; and
wherein the shell comprises less than 0.1 weight percent structural units of a phosphorus acid monomer, based on the weight of the shell.

4. The composition of claim 3 which further comprises a dispersion of polymer particles that do not have a protuberating core and which comprise from a) 0.1 to 4 weight percent structural units of a sulfur acid monomer or a salt thereof; b) from 35 to 74.9 weight percent structural units of methyl methacrylate or styrene or a combination thereof; and c) from 25 to 64.9 weight percent structural units of butyl acrylate or ethyl acrylate or a combination thereof.

5. The composition of claim 4 wherein the associative thickener comprises a polyether which is a hydrophobically modified ethylene oxide urethane polymer at a concentration of from 0.1 to 1 weight percent, based on the weight of the composition;
the polymer particles that do not have a protuberating core have the same composition as the composition of the shell of the phosphorus acid functionalized polymer particles;
wherein the weight-to-weight ratio of polymer particles with a protuberating core to particles without a protuberating core in the range of from 30:70 to 68:32; and
wherein the polymer particles that do not have a protuberating core and the shell of the phosphorus acid functionalized polymer particles comprise less than 0.1 weight percent of structural units of a phosphorus acid monomer.

6. The composition of claim 5 wherein the volume solids content of the composition is in the range of from 30 to 36 volume percent; and wherein the associative thickener comprises a polyol which is a hydrophobically modified ethylene oxide urethane polymer having a hydrophobic portion with a calculated log P in the range of from 4.0 to 4.8.

7. The composition of claim 5 wherein the volume solids content of the composition is in the range of from 36 to 44 volume percent; and wherein the associative thickener comprises a polyether which is a hydrophobically modified ethylene oxide urethane polymer having a hydrophobic portion with a calculated log P in the range of from 3.5 to 4.8.

8. The composition of claim 6 wherein the hydrophobic portion of the hydrophobically modified ethylene oxide urethane polymer is represented by the following structure:

wherein X is O or NR 2′ with the proviso that
X is O and R 1 is -H 12 MDI- when R 2 is CH 3 (CH 2 ) 3 — or CH 3 (CH 2 ) 2 —; or
X is O and R 1 is -IPDI- when R 2 is CH 3 (CH 2 ) 5 — or CH 3 (CH 2 ) 4 —; or
X is O and R 1 is -HDI- when R 2 is CH 3 (CH 2 ) 7 —; or
X is NR 2′ and R 1 is -H 12 MDI- when R 2 is benzyl and R 1 is CH 3 —; or
X is NR 2′ and R 1 is -H 12 MDI- when R 2 is cyclohexyl and R 2′ is H; or
X is NR 2′ and R 1 is -IPDI- when R 2 is CH 3 (CH 2 ) 5 — and R 2′ is H.

9. The composition of claim 4 wherein the associative thickener has a hydrophobic portion represented by O—R 3 , where R 3 is n-undecyl, n-decyl, n-nonyl, n-octyl, 2-ethylhexyl, 3,5,5-trimethylhexyl, 3,7-dimethyloctyl, dibenzylaminoethyl, 2-propylheptyl, diamylaminoethyl, n-octylphenyl, or 2,6-dimethylheptyl.

10. The composition of claim 7 wherein the hydrophobic portion of the hydrophobically modified ethylene oxide urethane polymer is represented by the following structure:

wherein X is O or NR 2′ with the proviso that
X is O and R 1 is -H 12 MDI- when R 2 is CH 3 (CH 2 ) 3 — or CH 3 (CH 2 ) 2 —; or
X is O and R 1 is -IPDI- when R 2 is CH 3 (CH 2 ) 5 — or CH 3 (CH 2 ) 4 — or CH 3 (CH 2 ) 4 — or benzyl; or
X is O and R 1 is -HDI- when R 2 is CH 3 (CH 2 ) 7 — or CH 3 (CH 2 ) 6 —; or
X is NR 2′ and R 1 is -H 12 MDI- when R 2 is benzyl and R 2′ is CH 3 —; or
X is NR 2′ and R 1 is -H 12 MDI- when R 2 is cyclohexyl and R 2′ is H; or
X is NR 2′ and R 1 is -IPDI- when R 2 is CH 3 (CH 2 ) 5 — and R 2′ is H; or
X is NR 2′ and R 1 is -IPDI- when R 2 and R 2′ are butyl.

11. The composition of claim 5 wherein the hydrophobic portion of the hydrophobically modified ethylene oxide urethane polymer is represented by the following structure:

wherein R 1 is -HDI- when R 2 is CH 3 (CH 2 ) 7 —O—.

Assignees

• Rohm & Haas
• Rohm and Haas Comopany

Inventors

• Bohling James C
• Brownell Arnold S
• Guo Jihui
• Henderson Kevin J
• Killian Ericka Lynn
• Rabasco John J
• Saucy Daniel A
• Stracke Jordan

Classifications

• C08K2003/2241

  Titanium dioxide · CPC title

• C08K9/08

  Ingredients agglomerated by treatment with a binding agent · CPC title

• C09D7/44

  Combinations of two or more thickening agents · CPC title

• C09D5/028

  Pigments; Filters · CPC title

• C09D151/003 Primary

  grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C09D151/04, C09D151/06 take precedence) · CPC title