B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/715
B29C 45/00 (2006.01) C08G 18/00 (2006.01) C08G 18/08 (2006.01) C08G 18/09 (2006.01) C08G 18/18 (2006.01) C08G 18/58 (2006.01)
Patent
CA 2030599
Mo3503 LeA 27,404 A PROCESS FOR THE PREPARATION OF PLASTIC MOLDINGS ABSTRACT OF THE DISCLOSURE The invention relates to the preparation of plastic moldings by curing reactive, liquid casting compositions at elevated temperatures using a process in which (1) a liquid casting composition is prepared by reacting (a) an organic polyisocyanate, and (b) an organic compound containing at least two epoxide groups in a quantity corresponding to an equivalent ratio of isocyanate groups to epoxide groups of about 1.2:1 to about 500:1, in the presence of (d) a stabilizing alkylating sulfonic acid alkyl ester, methyl iodide, or dimethyl sulfate, (e) a latent, heat-activatable catalyst (preferably a tertiary or quaternary ammonium salt of an alkylating or acidic ester of organic phosphonic acids or phosphoric acid and/or an addition complex of boron trihalides with tertiary amines), and (f) optional auxiliaries and/or additives; (2) the liquid casting composition is transferred under pressure through a conduit into a heated mold having a temperature above 70°C; and (3) the casting composition is kept in the mold under pressure until curing is complete. Mo3503
Franke Joachim
Muller Hanns-Peter
Muller Henry
Aktiengesellschaft Bayer
Franke Joachim
Muller Hanns-Peter
Muller Henry
Swabey Ogilvy Renault
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