Document Type and Number:
Japanese Patent JPS6317087
Kind Code:
B2
Abstract:
The instant invention is directed to a process for the production of polyurethane urea elastomers having a gross density of more than 200 kg/m3 comprising: casting a reaction mixture of (A) an isocyanate prepolymer produced from (a) 1 mole of a compound containing at least 2 Zerewitinoff-active hydrogen atoms and having a molecular weight of from 400 to 10,000 and (b) 2 to 10 moles of diisocyanatodiphenylmethane, (B) an aromatic diamine, and (C) 0 to 50 mole percent, based on component (B), of a polyol containing primary hydroxyl groups and having a molecular weight of from 62 to 6000, the equivalent ratio between component (A) and components (B) + (C) amounting to between 0.9:1 and 1.3:1, into a mold, hardening the reaction mixture in the mold and subsequently removing it from the mold, the improvement wherein said isocyanate prepolymer (A) has been produced using an isomer mixture comprising: from 15 to 80 mole percent of 2,4'-diisocyanatodiphenylmethane, from 20 to 85 mole percent of 4,4'-diisocyanatodiphenylmethane, and from 0 to 20 mole percent of 2,2'-diisocyanatodiphenylmethane.
Inventors:
GERUHARUTO GUREEKURERU
YURUGEN SHUINTO
OTSUTOO GANSUTERU
HANSU YOAHIMU MAINERUSU
HANSU DEIITERU RUUPUREHITO
YURUGEN SHUINTO
OTSUTOO GANSUTERU
HANSU YOAHIMU MAINERUSU
HANSU DEIITERU RUUPUREHITO
Application Number:
JP9334080A
Publication Date:
April 12, 1988
Filing Date:
July 10, 1980
Export Citation:
Assignee:
BAYER AG
International Classes:
C08G18/00; C08G18/10; C08G18/72; C08G18/76
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