Aqueous dispersion of polymeric composite microspheres

Patent metadata

Field	Value
Publication number	US-11370867-B2
Application number	US-202016782324-A
Country	US
Kind code	B2
Filing date	Feb 5, 2020
Priority date	Feb 25, 2019
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

The present invention relates to a composition comprising an aqueous dispersion of polymeric composite microspheres comprising an aqueous dispersion of polymeric composite microspheres that comprise a polysiloxane and a polymer, as defined herein, and a suspension polymerization process for making the composition. The composition is useful for making defect free coatings with a relatively low coefficient of friction.

First claim

The invention claimed is:

1. A composition comprising an aqueous dispersion of polymeric composite microspheres comprising a physical blend of a) from 0.3 to 70 weight percent of a polysiloxane and b) from 30 to 99.7 weight percent of a polymer that comprises, based on the weight of the polymer, from 85 to 99.9 weight percent structural units of a monoethylenically unsaturated nonionic monomer and from 0.05 to 5 weight percent nonionic polyalkylene oxide or anionic polyalkylene oxide salt of a distyryl or tristyryl phenol, which is represented by the compound of Formula I:

where each R is independently C 1 -C 4 -alkyl; R 1 is H, 1-phenethyl-(R) p , CH 2 —CR═CH 2 , or CH═CHCH 3 ; each R 2 is independently H, allyl, methyl, acrylate, methacrylate, or —CH 2 CHR 3 OX; each R 3 is independently H, methyl, or ethyl; m is 0 to 5; n is 6 to 40; p is 0, 1 or 2; and O—X is hydroxyl, methoxyl, a sulfate or a phosphate; wherein the polymeric microspheres have a solids content in the range of from 10 to 60 weight percent, based on the weight of the microspheres and water; wherein the polymeric microspheres have an average particle size in the range of from 1 μm to 25 μm; and wherein the polysiloxane is unreactive under free-radical polymerization conditions.

2. The composition of claim 1 wherein the polysiloxane is represented by Formula V:

wherein each R 4 is independently C 1 -C 30 -alkyl, O—C 1 -C 6 -alkyl, or H, with the proviso that at least one R 4 is C 1 -C 30 -alkyl; each R 5 is independently C 1 -C 30 -alkyl, H, or Si(R 6 ) 3 ; wherein each R 6 is independently C 1 -C 6 -alkyl; and n is from 4 to 10,000.

3. The composition of claim 2 where each R 4 is methyl; n is from 10 to 5000; and each R 5 is H.

4. A composition comprising an aqueous dispersion of polymeric composite microspheres comprising from 0.3 to 70 weight percent of a polysiloxane and from 30 to 99.7 weight percent of a polymer that comprises, based on the weight of the polymer, from 85 to 99.9 weight percent structural units of a monoethylenically unsaturated nonionic monomer, wherein the polysiloxane is represented by Formula V:

wherein each R 4 is independently C 1 -C 30 -alkyl, O—C 1 -C 6 -alkyl, or H, with the proviso that at least one R 4 is C 1 -C 30 -alkyl; each R 5 is independently C 1 -C 30 -alkyl, H, or Si(R 6 ) 3 ; wherein each R 6 is independently C 1 -C 6 -alkyl; and n is from 4 to 10,000;
wherein the polymeric microspheres have a solids content in the range of from 10 to 60 weight percent, based on the weight of the microspheres and water;
wherein the polymeric microspheres have an average particle size in the range of from 1.5 μm to 15 μm;
wherein the polymeric composite microspheres comprise from 1 to 10 weight percent structural units of a multiethylenically unsaturated nonionic monomer, based on the weight of the polymer;
wherein:
a) the composite particle is stabilized by from 0.05 to 5 weight percent of a compound of Formula II:

where n is 6 to 40; X is —SO 3 H, —SO 3 Y, —H 2 PO 3 , —HPO 3 Y, or —PO 3 Y 2 , where Y is Li + , Na + , K + , or NH 4 + ; or
b) the polymer is functionalized by the compound of formula III:

where n is 12 to 18, and R 1 is H, 1-phenethyl-(R) p , CH 2 —CR═CH 2 , or CH═CHCH 3 ; or
c) the polymer is functionalized by the compound of formula IV:
where n is 6 to 40,

5. The composition of claim 4 where each R 4 is methyl; n is from 10 to 5000; and each R 5 is H; and wherein the average particle size in the range of from 3.5 μm to 15 μm.

6. The composition of claim 1 wherein the monoethylenically unsaturated nonionic monomers are selected from the groups consisting of acrylates; methacrylates; acrylonitrile; acrylamides; styrene; and vinyl esters.

7. The composition of claim 1 wherein the average particle size in the range of from 3.5 μm to 15 μm.

8. The composition of claim 3 wherein the average particle size in the range of from 3.5 μm to 15 μm.

Assignees

• Rohm & Haas
• Dow Silicones Corp

Inventors

• Eryazici Ibrahim
• Grant Joseph
• Katzenstein Joshua M
• Liu Yihan
• Nungesser Edwin A
• Zimmerman Brett L

Classifications

• C08F283/12 Primary

  on to polysiloxanes · CPC title

• C09D183/12

  containing polyether sequences · CPC title

• C08F212/32

  containing two or more rings · CPC title

• C08F285/00 Primary

  Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers · CPC title

• C09D151/003

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