Dispersion of adsorbing emulsion polymer particles

Patent metadata

Field	Value
Publication number	US-9499691-B2
Application number	US-201615019444-A
Country	US
Kind code	B2
Filing date	Feb 9, 2016
Priority date	Jan 31, 2012
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

The present invention relates to a stable aqueous dispersion of polymer particles with structural units of a) a phosphorus acid monomer or a salt thereof; b) a carboxylic acid monomer or a sulfur acid monomer or a salt thereof or a combination thereof; c) a multiethylenically unsaturated monomer; and d) an acrylate monomer, wherein the polymer particles have a solids content in the range of 30 to 50 percent and a particle size of from 40 nm and 100 nm.

First claim

The invention claimed is:

1. A composition comprising a stable aqueous dispersion of polymer particles having:
a) from 2 to 10 weight percent structural units of a phosphorus acid monomer or a salt thereof;
b) from 0.2 to 20 weight percent structural units of a carboxylic acid monomer or a sulfur acid monomer or a salt thereof or a combination thereof;
c) from 0.1 to 30 weight percent structural units of a multiethylenically unsaturated monomer; and
d) structural units of bulk monomers comprising methyl methacrylate, ethyl hexyl acrylate, or styrene or a combination thereof; and ethyl acrylate, butyl acrylate, or 2-ethylhexyl acrylate or a combination thereof; wherein the polymer particles have a volume average particle size of from 40 to 100 nm; and wherein the percent solids of the polymer particles in the stable aqueous dispersion is from 30 to 50% weight percent, based on the weight of the stable aqueous dispersion of polymer particles.

2. The composition of claim 1 wherein the bulk monomers comprise from 5 to 60 weight percent structural units of methyl methacrylate or styrene and from 35 to 70 weight percent structural units of butyl acrylate, based on the weight of the polymer particles.

3. The composition of claim 1 wherein the bulk monomers comprise from 20 to 40 weight percent structural units of methyl methacrylate and from 50 to 70 weight percent structural units of butyl acrylate, based on the weight of the polymer particles.

4. The composition of claim 1 wherein:
a) the polymer particles comprises from 3 to 8 weight percent structural units of the phosphorus acid monomer or a salt thereof, based on the weight of the polymer particles, wherein the phosphorus acid monomer is phosphoethyl methacrylate or a salt thereof;
b) the polymer particles comprises from 0.2 to 10 weight structural units of the multiethylenically unsaturated monomer, based on the weight of the polymer particles, wherein the multiethylenically unsaturated monomer is allyl methacrylate;
c) the polymer particles comprises from 0.5 to 5 weight structural units of a carboxylic acid monomer or a salt thereof, based on the weight of the polymer particles; wherein the carboxylic acid monomer is methacrylic acid;
wherein the polymer particles have a volume average diameter in the range of from 50 nm to 90 nm.

5. The composition of claim 4 wherein the polymer particles have a volume average diameter in the range of from 60 nm to 75 nm.

6. The composition of claim 1 wherein the T g of the polymer particles is from −20 ° C. to 20 ° C.

Assignees

• Rohm & Haas

Inventors

• Bohling James C
• Brownell Arnold S
• Tiwary Yogesh

Classifications

• C09D133/14

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

• C08F2/001

  Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer (C08F295/00, C08F297/00 take precedence) · CPC title

• C08L51/003 Primary

  grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C08L51/04, C08L51/06 take precedence) · CPC title

• C08F265/04

  on to polymers of esters · CPC title

• C08F2/24

  with the aid of emulsifying agents · CPC title