US 5,308,910 AGranted

Composition, adhesive and aqueous emulsion

AssigneeKuraray Co., Ltd.

InventorsKen Yuki, Masato Nakamae, Hitoshi Maruyama, Tatsuaki Hattori

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Abstract

There is disclosed a composition which comprises an aqueous emulsion selected from (A-1) aqueous emulsion comprising a dispersoid which comprises a vinyl ester polymer (1) and a copolymer a (meth)acrylic ester and a primary hydroxyl group-containing ethylenically unsaturated monomer (2), the polymer (1) being present principally in the central part of the dispersoid, the copolymer (2) having a glass transition temperature of lower than 50.degree. C. an being present principally in the peripheral part thereof; and a dispersant comprising a vinyl alcohol polymer and (A-2) aqueous emulsion comprising a dispersoid which comprises a copolymer of a hydrophobic unsaturated monomer such as (meth)acrylic ester and a primary hydroxyl group-containing ethylenically unsaturated monomer; and a dispersant comprising a vinyl alcohol polymer having a mercapto group at an end thereof and a (B) polyvalent isocyanate compound. Disclosed also are an adhesive comprising the aforementioned composition and a wooden product which is joined by the use of the adhesive. The above-disclosed adhesive is excellent in initial adhesivity, adhesive strength, water resistance and so forth.

Claims4

Dependent claims

A composition which comprises an (A) aqueous emulsion and a (B) polyvalent isocyanate compound, wherein said (A) aqueous emulsion is selected from the group consisting of an (A-1) aqueous emulsion comprising a dispersoid which comprises a vinyl ester polymer (1) and a copolymer having a glass transition temperature of lower than 50.degree. C. containing at least one member selected from the group consisting of methacrylic ester monomer unit and acrylic ester monomer unit;

and a primary hydroxyl group-containing ethylenically unsaturated monomer unit (2), said polymer (1) being present principally in the central part of said dispersoid, said copolymer (2) being present principally in the peripheral part thereof, the ratio by weight of said polymer (1) to said copolymer (2) being in the range of 9:1 to 1:9;
and a dispersant comprising a vinyl alcohol polymer and an (A-2) aqueous emulsion comprising a dispersoid which comprises a copolymer containing at least one hydrophobic unsaturated monomer unit selected from the group consisting of methacrylic ester monomer unit, acrylic ester monomer unit, styrene monomer unit, diene monomer unit and halogenated unsaturated monomer unit;
and a primary hydroxyl group-containing ethylenically unsaturated monomer unit in an amount of 0.1 to 50% by weight based on said copolymer, wherein said (A-2) aqueous emulsion is obtained by emulsion polymerization in the presence of a dispersant comprising a vinyl alcohol polymer having a mercapto group at an end thereof.

Dependencies are inferred from the claim text.

Facts

Application: 07/903,449Filed 24 Jun 1992
Priority: JP 3-15307825 Jun 1991
Granted: 3 May 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

C08G 18/636
Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers: characterised by the presence of a…
C08G 18/6229
Polymers of esters of acrylic or methacrylic acid: polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic…
C08G 18/633
Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers: onto polymers of compounds having…
C09J 175/00
Adhesives based on polyureas or polyurethanes