Loading patent…
AssigneesMatsushita Refrigeration Company, Takeda Chemical Industries, Ltd.
InventorsKiyohiro Yuge, Hitoshi Muramatsu, Yasuto Masuda, Kazutaka Uekado, Yasuaki Tanimoto
Estimating the term…
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.
A method of producing an open cell rigid polyurethane foam which comprises reacting a polyol with a prepolymer obtained by the reaction of a polymethylene polyphenyl polyisocyanate with a monool by use of a substitute for trichlorofluoromethane as a blowing agent in the presence of a catalyst, a foam stabilizer and a cell opening agent.
An open cell rigid polyurethane foam produced by reacting a polyol with a polymethylene polyphenyl polyisocyanate prepolymer with a monool by use of a substitute for trichlorofluoromethane as a blowing agent in the presence of a catalyst, a foam stabilizer and a cell opening agent.
A vacuum heat insulating material which comprises an open cell rigid polyurethane foam enclosed in a metal-plastic laminate film under vacuum, the rigid foam being produced by reacting a polyol with a polymethylene polyphenyl polyisocyanate prepolymer with a monool by use of a substitute for trichlorofluoromethane as a blowing agent in the presence of a catalyst, a foam stabilizer and a cell opening agent.
Dependencies are inferred from the claim text.