Title:
PRODUCTION OF RIGID POLYURETHANE FOAM
Document Type and Number:
Japanese Patent JPH0384022
Kind Code:
A
Abstract:
PURPOSE:To improve hardness in obtaining rigid polyurethane foam comprising an organic polyisocyanate, polyol, catalyst, blowing agent and foam stabilizer by using a specific organic isocyanate. CONSTITUTION:A polyisocyanate comprising 8-47wt.% tolylene diisocyanate and 92-53wt.% polyphenylmethane polyisocyanate are reacted with a polyether polyol having 300-600mg KOH/g obtained by subjecting an alkylene oxide to addition polymerization to pentaerythritol to give a prepolymer having 30.0-35.5wt.% isocyanate content. An organic polyisocyanate comprising the prepolymer is reacted with a polyol (e.g. ethylene glycol) in the presence of a catalyst (e.g. triethylamine), a blowing agent (e.g. methylene chloride) and a foam stabilizer (e.g. polyoxyalkylene alkyl ether) to give rigid polyurethane foam suitable for building material.
Inventors:
SASAHARA TOSHIAKI
TANAKA KAZUYUKI
IKEGAMI TAKESHI
TANAKA KAZUYUKI
IKEGAMI TAKESHI
Application Number:
JP21992189A
Publication Date:
April 09, 1991
Filing Date:
August 25, 1989
Export Citation:
Assignee:
NIHON URETHANE SERVICE KK
International Classes:
C08G18/10; C08G18/48; C08G18/72; C08G18/76; C08G101/00; (IPC1-7): C08G18/10; C08G18/48
Domestic Patent References:
| JPS6448815A | 1989-02-23 | |||
| JPS50138095A | 1975-11-04 |
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