Bridgestone Tire Company Limited

Katsuhiko Arai

Takashi Ohashi

Toru Okuyama

Akira Suzuki

Yoshiko Taniguchi

Ryozo Sakata

Toshio Yukuta

Minoru Kojima

Masumi Saito

Hiroshi Kaneda

Masako Yoshida

Toru Okoyama

Hideki Sugihara

Masashi Dobashi

Hirobumi Ohwada

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 laminate 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 an aluminum foil with a thickness of not less than 0.015 mm as a front surface material piled on the foam through self-adhesion of the foam. When the foam is produced by reacting an organic polyisocyanate with polyols as a modifier 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 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.

Fireproof laminates

A fireproof laminate 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 particular surface materials piled on both sides of the foam through self-adhesion of the foam and has a density of the core material of 0.02-0.04 g/cm.sup.3 and a total thickness of not more than 30 mm.

Asbestos-metal surfaced urethane modified polyisocyanurate foam

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.

A laminate having excellent flameproofing and low-smoke development is disclosed. The laminate comprises an urethane modified polyisocyanurate foam as a core material and an aluminum foil or sheet as a surface material piled on at least one surface of the foam through a self-adhesion of the foam and passes Grade 2 incombustibility according to Japanese Industrial Standard (JIS) A-1321 combustion test.

Urethane modified polyisocyanurate foam surfaced with aluminum foil or

Polyisocyanurate foams having excellent heat resistance and flame resistance are produced by using no common organic silicone surfactant or using less than 0.2% by weight based on an organic polyisocyanate, of said organic silicone surfactant, when producing a polyisocyanurate foam by reacting an organic polyisocyanate, a blowing agent and a catalyst for trimerizing isocyanate and if necessary a surfactant, a modifier and the other additives.

Method for producing heat resistant and flame resistant polyisocyanurate

An excellent flame- and smoke-retardant non-shrinkable polyurethane foam is prepared by reacting a polyhydroxyl compound consisting of

Excellent flame-and smoke-retardant non-shrinkable polyurethane foam

An excellent flame- and smoke-resistant polyurethane foam is produced by reacting a polyol, a polyisocyanate and an amine-carbamate of primary or secondary amine having hydroxyl group in the presence of a catalyst and a surfactant.

Flame- and smoke-resistant polyurethane foam and a method for producing

A thermoplastic and organic solvent-soluble poly(amide-imide) elastomer having a number average molecular weight ranging from 10,000 to 100,000, prepared by reacting (1) an acid anhydride functional polymer, represented by the following formula ##STR1## or a mixture of said acid anhydride functional polymer (1) and a tetracarboxylic acid dianhydride, with (2) a dicarboxylic acid dihydrazide in the presence of an aprotic dipolar solvent at a temperature ranging from -10.degree. C to 30.degree. C.

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Akigawa, Japan

Katsuhiko Arai