Internal mold release agent for use in molding polyurethanes and/or polyureas

An isocyanate-reactive composition comprising

• (i) a high molecular weight polymer having at least two isocyanate-reactive groups and having a molecular weight of from 400 to about 10,000,
• (ii) from about 5 to 50% by weight, based on the weight of component (i) of a chain-extender having at least two isocyanate-reactive groups and
• (iii) an internal mold release agent mixture comprising:
• (a) from about 0.05 to about 10% by weight, based on the weight of components (i) and (ii) of a zinc carboxylate selected from the group consisting of zinc oleate and zinc laurate, and
• (b) a compatibilizer comprising a fatty amine derivative of the formula:
• ##STR10## where R represents hydrogen or methyl,
• R' represents a C.sub.8 to C.sub.20 straight or branched, saturated or unsaturated, aliphatic group or the group ##STR11## where R.sup.2 represents a C.sub.8 to C.sub.20 straight or branched, saturated or unsaturated, aliphatic group, and n is an integer of from 1 to 4, x, y and z are each numbers between 1 and 49 and x+y+z is from 3 to 50, in an amount sufficient to solubilize the zinc carboxylate so that when component (iii) is in admixture with components (i) and (ii), the zinc carboxylate possesses improved resistance to precipitation.

In a process for preparing a molded product by reacting an isocyanate with an isocyanate-reactive material in a mold, the improvement wherein the reaction mixture contains an internal mold release composition comprising

• (a) a zinc carboxylate selected from the group consisting of zinc oleate and zinc laurate, and
• (b) a compatibilizer comprising a fatty amine derivative of the formula:
• ##STR12## where R represents hydrogen or methyl,
• R' represents a C.sub.8 to C.sub.20 straight or branched, saturated or unsaturated, aliphatic group or the group ##STR13## where R.sup.2 represents a C.sub.8 to C.sub.20 straight or branched, saturated or unsaturated, aliphatic group, and n is an integer of from 1 to 4, x, y and z are each numbers between 1 and 49 and x+y+z is from 3 to 50, in an amount sufficient to solubilize the zinc carboxylate.