Diamine/diol chain extender blends for rim process

Details Diamine/diol chain extender blends for rim process Diamine/diol chain extender blends for rim process

C - Chemistry, Metallurgy

08

G

400/106, 402/138

C08G 18/65 (2006.01) C08G 18/32 (2006.01) C08G 18/38 (2006.01)

Patent

CA 1202744

DIAMINE/DIOL CHAIN EXTENDER BLENDS FOR RIM PROCESS ABSTRACT A chain extending agent for reaction injection molding ding (RIM) comprising a normally liquid blend of butanediol and a toluene diamine mono-substituted with an electron withdrawing group and having the formula Image wherein X is vicinal to an amino radical and is selected from the group of halogen, CN, NO2, acyl, carboxylate and isomeric mixtures thereof, and wherein the butanediol and diamine are combined in a critical mcle ratio of from 4:1 to about 19:1. The above blend is particularly useful in the preparation of large moldings or polyurethane-polyurea elastomer by the RIM or RRIM (reinforced reaction injection molding) process wherein instant preformed blend is added to a mixture of polyol reactant and catalyst before polymerization in the mold with isocyanate to produce a urethane/urea polymer product of improved properties. Accordingly, the invention also concerns an enhanced RIM or RRIM process and improved product by the use of a mixture of the present chain extender blend and polyol reactant maintainable in the liquid state at ambient temperature.

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