C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/138
C08G 18/32 (2006.01) C08G 18/50 (2006.01) C08G 18/66 (2006.01)
Patent
CA 1180146
ABSTRACT This invention is directed to a process for preparing reaction injection molded polyurethane compo- sitions by reacting (A) a relatively high molecular weight hydroxyl-containing polyol and (B) a chain extender with (C) a polyisocyanate, a polyisothiocyanate or a mixture thereof. The chain extender, component (B), is a mixture comprising (1) at least one of (a) hydroxyl-containing chain extenders which are free of aliphatic amine hydrogen atoms, have an average hydroxyl functionality of from 2 to 4 and have an average hydroxyl equivalent weight of from 30 to 120 or (b) aromatic amine-containing chain extenders which are free of aliphatic amine hydrogen atoms and which contain at least two aromatic amine hydrogen atoms and (2) at least one aliphatic amine- -containing chain extender having at least one primary amine group, an average aliphatic amine hydrogen func- tionality of from 2 to 16 and an average aliphatic amine hydrogen equivalent weight of from 15 to 500; and wherein components (A), (B) and (C) are present in quantities such that the weight percent of the theoretical reaction product of the amine hydrogen atoms of component (B-2) with a stoichiometric quantity of component (C) based upon the total weights of components (A), (B) and (C) is from 5 to 25 and the NCX index is from 0.6:1 to 1.50:1 with the proviso that when an NCX trimerization catalyst is also present, the index is up to 5:1. 28,659-F
369030
Lancaster Gerald M.
Vanderhider James A.
Smart & Biggar
The Dow Chemical Company
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