Aqueous emulsion and adhesive using same

Patent metadata

Field	Value
Publication number	US-2022259468-A1
Application number	US-202017625202-A
Country	US
Kind code	A1
Filing date	Jul 6, 2020
Priority date	Jul 8, 2019
Publication date	Aug 18, 2022
Grant date	—

Abstract

An aqueous emulsion may include: an ethylene-vinyl alcohol copolymer (A) as a dispersant; and a polymer (B) containing an unsaturated ethylenic monomer unit as a dispersoid, wherein the ethylene-vinyl alcohol copolymer (A) has a content of ethylene units of 1 mol % or more and less than 20 mol % and a block character of the ethylene units from 0.90 to 0.99. The aqueous emulsion may contain the ethylene-vinyl alcohol copolymer (A), as a dispersant, having a specific structure and is thus excellent in storage stability at low temperatures and water-resistant adhesiveness.

First claim

1 . An aqueous emulsion, comprising:
an ethylene-vinyl alcohol copolymer (A) as a dispersant; and a polymer (B) comprising an unsaturated ethylenic monomer unit as a dispersoid, wherein the ethylene-vinyl alcohol copolymer (A) has a content of ethylene units in a range of from 1 to less than 20 mol %, and wherein ethylene units in the ethylene-vinyl alcohol copolymer (A) have a block character in a range of from 0.90 to 0.99.

2 . The emulsion of claim 1 , wherein the ethylene-vinyl alcohol copolymer (A) has a viscosity-average degree of polymerization in a range of from 200 to 5000, and
a degree of saponification in a range of from 80 to 99.7 mol %.

3 . The emulsion of claim 1 , further comprising:
a compound with a molecular weight of 1000 or less, comprising a conjugated double bond, in a range of from 0.000001 to 0.01 parts by mass, based on 100 parts by mass of the ethylene-vinyl alcohol copolymer (A).

4 . The emulsion of claim 1 , wherein the polymer (B) comprises 70 mass % or more, based on total monomer units, of monomer units derived from at least one selected from the group consisting of a vinyl ester monomer, a (meth)acrylic ester monomer, a styrene monomer, and a diene monomer.

5 . The emulsion of claim 1 , wherein an (A)/(B) mass ratio of the ethylene-vinyl alcohol copolymer (A) to the polymer (B) is in a range of from 2/98 to 40/60.

6 . The emulsion of claim 1 , further comprising:
an aliphatic alcohol (C) in a range of from 0.0001 to 1 part by mass, based on 100 parts by mass of the ethylene-vinyl alcohol copolymer (A).

7 . An adhesive, comprising:
the aqueous emulsion of claim 1 .

8 . A method of producing the aqueous emulsion of claim 1 , the method comprising:
emulsion polymerizing the unsaturated ethylenic monomer in the presence of the dispersant comprising the ethylene-vinyl alcohol copolymer (A).

9 . The emulsion of claim 1 , wherein the polymer (B) comprises 70 mass % or more, based on total monomer units, of a monomer comprising a vinyl ester monomer, a (meth)acrylic ester monomer, a styrene monomer, a diene monomer, or a mixture of two or more of these.

10 . The emulsion of claim 1 , wherein the ethylene-vinyl alcohol copolymer (A) has a viscosity-average degree of polymerization in a range of from 200 to 5000.

11 . The emulsion of claim 1 , wherein a degree of saponification in a range of from 80 to 99.7 mol %.

12 . The emulsion of claim 1 , further comprising:
a compound with a molecular weight of 1000 or less, comprising a conjugated double bond, in a range of from 0.000001 to 0.01 parts by mass, based on 100 parts by mass of the ethylene-vinyl alcohol copolymer (A); and an aliphatic alcohol (C) in a range of from 0.0001 to 1 part by mass, based on 100 parts by mass of the ethylene-vinyl alcohol copolymer (A).

Assignees

• Kuraray Co

Inventors

• Imaoka Yoriko
• Tanida Tatsuya

Classifications

• C09J4/06

  {Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond} in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00 · CPC title

• C09D131/04

  Homopolymers or copolymers of vinyl acetate · CPC title

• C08F8/12

  Hydrolysis · CPC title

• C09J131/04 Primary

  Homopolymers or copolymers of vinyl acetate · CPC title

• C08F2/30 Primary

  non-ionic · CPC title