Bridgestone Tire Company Limited

Hiroshi Kaneda

Takashi Ohashi

Toru Okuyama

Shiro Anzai

Katsuhiko Arai

Yoji Watabe

Michio Ishii

Yasuyuki Ura

Akira Suzuki

Yoshiko Taniguchi

Masako Yoshida

Masao Kuwano

Akio Souma

Fumitaka Ino

A process for producing urethane-modified polyisocyanurate foams in which a poly(oxyalkylene-oxyethylene)polyether polyol is used as a modifying agent having the number of functional groups and the molecular weight in specific ranges with the equivalent ratio of NCO/OH being in a specific range and containing a specific quantity of ethylene oxide. The use of this modifying agent provides urethane-modified polyisocyanurate foams exhibiting excellent fire resistance and adhesion to an object surface.

Process of producing urethane-modified polyisocyanurate foams

A fireproof laminates passing Grade 2 incombustibility according to Japanese Industrial Standard (JIS) A-1321 combustion test is disclosed. The laminate comprises a urethane modified polyisocyanurate foam as a core material and a particular front surface material piled on the core material through self-adhesion of the foam.

Fireproof laminates

A method of producing flameproof polyisocyanurate foams is disclosed. When the foam is produced by reacting an organic polyisocyanate with polyols as a modifying agent in the presence of an isocyanate trimerization catalyst, a blowing agent and other additives, a combination of particular low molecular weight diols with particular high molecular weight polyether polyols is used as the polyol in a special weight ratio and a special total amount per 100 parts by weight of the organic polyisocyanate in the presence of special combination of an alkali metal salt of a carboxylic acid and a tertiary amine compound as the catalyst.

Method of producing flameproof polyisocyanurate foams

Tire filling material having high resilience produced by curing a mixture of

Polyurethane tire filling material with plasticizer incorporated therein

A soft polyurethane elastomer containing isocyanurate ring prepared by reacting polyoxypropylene polyol having an OH equivalent molecular weight of about 500-3,000, and a functionality of about 2-5, and polyisocyanate compound in the presence of tertiary amine catalyst, and if desired further combined with organic tin catalyst. This process is advantageous in facilitation of material control during curing reaction, low exothermicity and high thermal stability of the resulting polymer. Further the properties of the polymer are improved by using ethyleneoxide addition polyoxypropylene polyol instead of the above polymer and a specific tertiary amine as a catalyst. The elastomer thus prepared is significantly suitable for tire filling material.

Soft polyurethane elastomer containing isocyanurate ring

Growing community of inventors

Higashimurayama, Japan

Hiroshi Kaneda