Aqueous emulsion, adhesive composition, and aqueous emulsion manufacturing method

Patent metadata

Field	Value
Publication number	US-10604593-B2
Application number	US-201515517538-A
Country	US
Kind code	B2
Filing date	Nov 16, 2015
Priority date	Nov 18, 2014
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

There is provided an aqueous emulsion derived from a blend comprising an acrylic polymer, wherein the pH of the dispersion medium is less than 7.0, and a water-in-oil emulsion containing a nonionic water-soluble polymer, which aqueous emulsion has viscosity of 1,000 to 15,000 mPa s at 25° C. There are also provided adhesive compositions made using the aqueous emulsion and methods for manufacturing the aqueous emulsion.

First claim

What is claimed is:

1. An aqueous emulsion derived from a blend comprising:
(a) an oil-in-water emulsion comprising an acrylic polymer in a dispersion medium, wherein the dispersion medium has a pH of 4.5 to 6.5, and
(b) a water-in-oil emulsion comprising a nonionic water-soluble polymer, wherein the aqueous emulsion has viscosity of 1,000 to 15,000 mPa·s at 25° C.;
wherein the acrylic polymer is a polymer in which the content of monomer units derived from (meth)acryloyl group-containing monomers exceeds 50% by mass; and
wherein the acrylic polymer comprises monomer units derived from alicyclic (meth)acrylate monomers.

2. An adhesive composition comprising the aqueous emulsion according to claim 1 .

3. A method of manufacturing the aqueous emulsion according to claim 1 , wherein the manufacturing method comprises a blending step in which the oil-in-water emulsion comprising an acrylic polymer in a dispersion medium is blended with the water-in-oil emulsion comprising a nonionic water-soluble polymer.

4. The manufacturing method according to claim 3 , wherein the water-in-oil emulsion is added to the oil-in-water emulsion during the blending step.

5. The manufacturing method according to claim 3 , wherein the oil-in-water emulsion is added to the water-in-oil emulsion during the blending step.

6. The aqueous emulsion of claim 1 wherein the acrylic polymer is obtained by polymerization of two or more acrylic monomers.

7. The adhesive composition of claim 2 wherein the acrylic polymer is obtained by polymerization of two or more acrylic monomers.

8. The aqueous emulsion of claim 1 wherein the acrylic polymer is obtained by polymerization of three or more acrylic monomers.

9. The adhesive composition of claim 2 wherein the acrylic polymer is obtained by polymerization of three or more acrylic monomers.

10. The aqueous emulsion of claim 1 wherein the acrylic polymer is a core-shell resin particle.

11. The adhesive composition of claim 2 wherein the acrylic polymer is a core-shell resin particle.

12. The aqueous emulsion of claim 6 wherein the acrylic polymer is a core-shell resin particle.

13. The adhesive composition of claim 7 wherein the acrylic polymer is a core-shell resin particle.

14. The aqueous emulsion of claim 8 wherein the acrylic polymer is a core-shell resin particle.

15. The adhesive composition of claim 9 wherein the acrylic polymer is a core-shell resin particle.

16. The aqueous emulsion of claim 10 wherein the core-shell resin particle comprises a core comprising an acrylic polymer comprising monomer units derived from alicyclic (meth)acrylate monomers.

Assignees

• 3M Innovative Properties Co

Inventors

• Fujita Jun
• Kinoshita Takumi

Classifications

• C08L33/26

  Homopolymers or copolymers of acrylamide or methacrylamide · CPC title

• C09J151/003

  grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C09J151/04, C09J151/06 take precedence) · CPC title

• C08F2/26 Primary

  anionic · CPC title

• C09J133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09J11/08

  Macromolecular additives · CPC title