Konishi Co., Ltd.

Kuraray Co., Ltd.

Toshiki Origuchi

Hideki Maki

Shintaro Ogawa

Yukiharu Hayashi

Yoshitaka Nakayama

Yuji Ikemura

To provide vinyl-urethane copolymers that can form cured articles having excellent hot-water resistance, water resistance, heat resistance, and weather resistance, and to provide production methods thereof. A vinyl-urethane copolymer contains at least one vinyl polymer chain and at least one urethane polymer chain, in which the vinyl polymer chain is combined with the urethane polymer chain through a linkage segment having a silicon-oxygen bond. A method produces a vinyl-urethane copolymer comprising at least one vinyl polymer chain and at least one urethane polymer chain, in which the vinyl polymer chain is combined with the urethane polymer chain through a linkage segment having a silicon-oxygen bond, by following Steps (X) and (Y): Step (X) of carrying out preparation of an aqueous dispersion or aqueous solution of a urethane polymer (A) having at least one silicon-containing hydrolyzable group; and Step (Y) of, in the aqueous dispersion or aqueous solution of the urethane polymer (A) having at least one silicon-containing hydrolyzable group, carrying out polymerization of an ethylenically unsaturated monomer (B) and carrying out preparation of a vinyl-urethane copolymer using a compound (C) having at least one functional group reactive with a silicon-containing hydrolyzable group and at least one functional group reactive with an ethylenically unsaturated bond-containing group in at least one period selected from before the polymerization reaction, during the polymerization reaction, and after the polymerization reaction.

Vinyl-urethane copolymers with intermediary linkage segments having silicon-oxygen bonds and production methods thereof

A process of the invention produces a vinyl acetate polymer based emulsion by seed polymerization of vinyl acetate in an ethylene-vinyl acetate copolymer based emulsion. This process includes a step of performing seed polymerization while adding vinyl acetate to a system, and, prior to or subsequent to the step, a step of adding a polymerizable unsaturated monomer other than vinyl acetate to the system. The amount of the polymerizable unsaturated monomer other than vinyl acetate is, for example, about 0.05 to 10 parts by weight relative to 100 parts by weight of vinyl acetate. At least one monomer selected from acrylic esters, methacrylic esters, vinyl esters, and vinyl ethers can be used as the polymerizable unsaturated monomer other than vinyl acetate. The invented process can produce a vinyl acetate polymer based emulsion which has satisfactory low-temperature film-forming property and adhesive strength, even containing no plasticizer, and which can exhibit a high adhesive strength even when cured at low temperatures.

Process for producing vinyl acetate resin emulsion and water-based adhesive

Disclosed is a two-part adhesive comprising: (A) an aqueous emulsion liquid having a polymer component and an emulsifier component, in which at least one of the polymer component and the emulsifier component contains an anion radical; and (B) a solution having an amino-radical-containing acrylic copolymer. The amount of the polymer component in the aqueous emulsion liquid is within a range of from about 20% to about 80% by weight. When the aqueous emulsion liquid (A) contacts the solution (B) on an adherend surface, they form sticky gel adhesive.

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Osaka, Japan

Toshiki Origuchi