Process for producing elastic polyurethane mouldings with...

Details Process for producing elastic polyurethane mouldings with... Process for producing elastic polyurethane mouldings with...

C - Chemistry, Metallurgy

08

G

C08G 18/66 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08G 18/76 (2006.01) C08J 9/34 (2006.01)

Patent

CA 2253903

A process for the production of elastic polyurethane mouldings with compact surfaces and cellular cores by reacting a) modified organic polyisocyanates with b) at least one compound with at least two reactive hydrogen atoms and possibly c) chain-lengthening agents in the presence of d) blowing agents, e) catalysts and possibly f) conventional auxiliaries and/or additives, in a closed mould under compression, in which at least one reaction product of pure MDI and at least one polyether alcohol (polyoxyalkylene polyol) with an NCO content of < 15 wt.% is used as the modified organic polyisocyanate.

Procédé de fabrication de corps moulés en polyuréthane élastiques à surface compacte et à noyau cellulaire, consistant à faire réagir, dans un moule fermé, sous compression, a) des polyisocyanates organiques modifiés, avec b) au moins un composé ayant au moins deux atomes d'hydrogène réactifs et, éventuellement, c) des agents d'allongement de chaîne, en présence d) d'agents gonflants, e) de catalyseurs et, le cas échéant, f) d'agents auxiliaires et/ou d'adjuvants usuels, caractérisé en ce qu'on utilise comme polyisocyanates organiques modifiés au moins un produit réactionnel de MDI pur (4, 4'-diisocyanate-diphénylméthane) et au moins un polyéther-alcool (polyoxyalkylènepolyol) à teneur en NCO inférieure à 15 % en poids.

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