Internal mold release agent for use in reaction injection molding

Claim 1

A process for preparing a molded product comprising introducing a reaction mixture into a closed mold via the RIM process wherein said reaction mixture comprises an organic isocyanate, an isocyanate-reactive component, and an internal mold release composition comprising (a) a zinc carboxylate containing from 8 to 24 carbon atoms per carboxylate group, and (b) a compatibilizer comprising a salt of (i) an amidine group-containing compound of the formula ##STR7## wherein R 1 , R 2 and R 3 are straight or branched, saturated or unsaturated hydrocarbon chains having up to 30 carbon atoms which may be substituted by ether groups, ester groups, amide groups or amidine groups and may also be terminated by isocyanate-reactive groups, R 4 corresponds to the definition or R 1 , R 2 and R 3 , but may additionally represent an aromatic substituent having 6 to 15 carbon atoms or may represent the group --NR 2 R 3 , with the proviso that when R 4 represents the group --NR 2 R 3 , R 1 can be hydrogen, and wherein R 1 , R 2 , R 3 and R 4 , may, with one or both of the amidine nitrogens, form a heterocyclic ring, and (ii) a member selected from the group consisting of phenolic hydroxyl group containing compounds and aliphatic carboxylic acids, in an amount sufficient to solubilize the zinc carboxylate.