Takeda Chemical Industries, Inc.

Daikin Industries, Ltd.

Matsushita Refrigeration Company

Kiyohiro Yuge

Hitoshi Muramatsu

Tatsumi Tsuchiya

Kazutaka Uekado

Yukio Omure

Yasuaki Tanimoto

Katsuhisa Kodama

Shoichi Fujita

Yasuto Masuda

Method of producing rigid polyurethane foams

A method of producing an open cell rigid polyurethane foam which comprises reacting a polymethylene polyphenylisocyanate prepolymer with a polyol at an NCO/OH equivalent ratio of 1.3 to 3.0 by use of a blowing agent substantially comprising water in the presence of a catalyst, a foam stabilizer and a cell opening agent.

Method for producing open cell rigid polyurethane foam

A method of producing an open cell rigid polyurethane foam which comprises reacting a polyol with a polymethylene polyphenyl polyisocyanate prepolymer with a monool exemplified by diethylene glycol monomethyl ether by use of a substitute such as 1,1-dichloro-1-fluoroethane or methylene chloride as a volatile blowing agent, or a mixture of the volatile blowing agent with water, for trichlorofluoromethane as a blowing agent in the presence of a catalyst, a foam stabilizer and a cell opening agent. The resultant open cell rigid polyurethane foam has a cell size of about 200-250 microns, and is suitable for use, for example, as a core material in a vacuum heat insulating material. The foam may be enclosed in a container under a vacuum of 0.1-0.01 mmHg readily attainable to provide a vacuum heat insulating material of a high heat insulating performance.

Production and use of open cell rigid polyurethane foam

A method for producing a fire-resistant, thermally insulating board, which comprises applying liquid hydrated sodium silicate (B) onto the inner surface of a facing material or sheet (A), spreading powdery hydrated sodium silicate (C) over the said applied surface, laying the said spread surface on

Method for producing fire-resistant, thermally insulating board

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Yawata, Japan

Kiyohiro Yuge