The Yokohama Rubber Co., Ltd.

Yutaro Yamamoto

Kazushi Kimura

Hirokazu Kageyama

Satoshi Mihara

The two-part curable adhesive composition contains a main agent (A) containing a urethane prepolymer (a1) and a residual polyisocyanate (a2), and a curing agent (B) containing a polyol compound (b1) and a polyamine compound (b2). The urethane prepolymer (a1) is made by reacting in an equivalent ratio of an isocyanate group in a raw material polyisocyanate to a hydroxy group in a polycarbonate polyol being 2.05 or greater. The equivalent ratio of an isocyanate group in the main agent (A) to an active hydrogen group in the curing agent (B) is from 0.5 to 4.

Two-pack curable adhesive composition

The two-part curable adhesive composition contains a main agent (A) containing a urethane prepolymer (a1) and a residual polyisocyanate (a2), and a curing agent (B) containing a polyol compound (b1) and a polyamine compound (b2). The urethane prepolymer (a1) is made by reacting in an equivalent ratio of an isocyanate group in a raw material polyisocyanate to a hydroxy group in a polytetramethylene ether glycol being 2.05 or greater. The equivalent ratio of an isocyanate group in the main agent (A) to an active hydrogen group in the curing agent (B) is from 0.5 to 4.

A two-part curable adhesive composition includes a main agent (A) containing a urethane prepolymer (a1) and a remaining polyisocyanate (a2), and a curing agent (B) containing a non-crystalline polyol compound (b1) and a polyamine compound (b2). An equivalent ratio of an isocyanate group in a raw polyisocyanate to a hydroxyl group in a crystalline polyol compound constituting the urethane prepolymer (a1) is from 2.05 to 12. An NCO group/total active hydrogen group ratio is from 0.5 to 4. An isocyanate group/hydroxyl group ratio is from 2 to 12.

Two-part curable adhesive composition

A polyurethane foam is obtained by foaming a blend containing a polyol and a polyisocyanate. The polyol contains a polycarbonate diol that has a polyester structure and a polycarbonate diol obtained by developing a polymerization reaction using 1,5-pentanediol and 1,6-hexanediol. The polyurethane foam has a density from 0.1 to 0.4 g/cm.

Polyurethane foam

A two-part curable adhesive composition includes a main agent (A) containing a urethane prepolymer (a1) and a remaining polyisocyanate (a2), and a curing agent (B) containing a non-crystalline polyol compound (b1) and a polyamine compound (b2). An equivalent ratio of an isocyanate group in a raw polyisocyanate to a hydroxyl group in the polyol compound is from 2.05 to 12. The equivalent ratio of the isocyanate group in the main agent (A) to an amino group in the polyamine compound (b2) is from 1.2 to 6. The equivalent ratio of the isocyanate group in the main agent (A) to the hydroxyl group in the non-crystalline polyol compound (b1) is from 2 to 12.

The present technology provide a rubber composition including: 100 parts by mass of a diene rubber, from 30 to 100 parts by mass of carbon black and/or a white filler, from 1 to 20 parts by mass of silicone-based microparticles that have an average particle size from 5 to 500 μm and that are three-dimensionally crosslinked, from 0.1 to 10 parts by mass of a nonionic surfactant, and from 1 to 20 parts by mass of thermally expanding microcapsules.

Rubber composition for tire and studless tire

A rubber composition for a tire according to an embodiment of the present technology includes: 100 parts by mass of a diene rubber and from 1 to 30 parts by mass of a thermally expandable microcapsule composite body, and the thermally expandable microcapsule composite body contains one or more thermally expandable microcapsules and an acrylonitrile butadiene copolymer and/or a crosslinked body thereof covering the one or more thermally expandable microcapsules.

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Hiratsuka, Japan

Yutaro Yamamoto