Asahi Glass Company, Limited

Hiromitsu Takeyasu

Hisashi Sato

Nobuaki Kunii

Takao Doi

Takashi Watabe

Sigeyuki Kozawa

Takayuki Sasaki

Hiroshi Wada

Hirotsugu Yamamoto

Chitoshi Suzuki

Yoshinori Toyota

Shigeyuki Kozawa

Joichi Saito

Akio Horie

Yoshiyuki Yamaguchi

Minako Okamura

Nobuaki Tsukida

Tsunehisa Sonobe

A process for producing a flexible polyurethane foam satisfying low resilience, high vibration absorption and high durability, is presented. A mixture comprising from 95 to 50 mass % of a polyoxyalkylene polyol produced by means of an alkali metal catalyst and from 5 to 50 mass % of a polyoxyalkylene polyol produced by means of a double metal cyanide complex catalyst, is reacted with a polyisocyanate compound in the presence of a catalyst and a blowing agent, to produce a flexible polyurethane foam having a resonance frequency of at most 3.7 Hz, a resonance ratio of at most 3.5 and an impact resilience of at most 70%.

Process for producing flexible polyurethane foam

A method of producing a heat insulating board comprising two opposed facings and a core made of a rigid synthetic resin foam, which comprises spraying or injecting a foam mix for the rigid synthetic resin foam into the space between the opposed face materials and expanding and curing the foam mix, wherein the foam mix comprises a particular polyol, a polyisocyanate, a foam stabilizer, a catalyst and a blowing agent, wherein the polyol contains a polyether polyol having a hydroxyl value of at most 84 mgKOH/g and an oxyethylene group content of at least 40 wt %; a polyether polyol which is obtained by adding a cyclic ether to an amine compound and has a hydroxyl value of from 250 to 900 mgKOH/g; and fine polymer particles stably dispersed in the polyol.

Method for producing a thermally insulating plate

A method for producing a foamed synthetic resin which comprises reacting a polyisocyanate compound with an active hydrogen compound having at least 2 active hydrogen-containing functional groups reactive with an isocyanate group in the presence of a foaming agent, wherein the foaming agent comprises at least two kinds of 1,1,1,3,3-pentafluoropropane and 1,1,1,2-tetrafluoroethane.

Method for producing foamed synthetic resin

A method for producing a polyurethane flexible foam, which comprises reacting at least one high molecular weight polyol selected from the group consisting of a polyoxyalkylene polyol having a hydroxyl value of from 5 to 38 mgKOH/g, from 2 to 8 hydroxyl groups and a total unsaturation degree of not more than 0.07 meq/g and a polymer-dispersed polyol containing said polyoxyalkylene polyol as the matrix, an optional crosslinking agent and a polyisocyanate compound in the presence of a low viscosity compound having an addition-polymerizable unsaturated group, a catalyst, a foaming agent and a foam stabilizer.

Method for producing polyurethane flexible foam

Process for producing a polyoxyalkylene compound

The present invention relates a method for producing a polyether ester polyol containing polycarboxylic acid residues in the vicinity of the terminals, by means of a doubles metal cyanide complex catalyst. Namely, the present invention is a method for producing a polyether ester polyol by reacting a polyether polyol having a hydroxyl value of at most 400, a polycarboxylic anhydride and a monoepoxide by means of a double metal cyanide complex as a catalyst. The present invention relates also to a process for producing a flexible polyurethane foam or a polyurethane elastomer using this polyether ester polyol. The flexible polyurethane foam produced has a high thermal fusing properties, and by laminating it with e.g. cloth, it is possible to obtain a laminate having high bond strength. Further, this polyurethane elastomer has superior physical properties as compared with an elastomer obtainable by using a polyether polyol or a polyester polyol.

Methods for producing polyether ester polyols and polyurethanes

Polyurethane flexible foam and method for its production

A method for purifying a polyoxyalkylene alcohol, which comprises treating with a treating agent consisting essentially of a pH buffer, a polyoxyalkylene alcohol containing a double metal cyanide complex catalyst, synthesized by ring-opening polymerization of an alkylene oxide in the presence of said catalyst, and then removing the catalyst and the treating agent from the polyoxyalkylene alcohol.

Method for purifying a polyoxyalkylene alcohol

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Tokyo, Japan

Hiromitsu Takeyasu