Abstract: Internal mold release compositions for use in preparing molded polymeric products are disclosed which contain (a) a primary or secondary amine (b) a carboxylic acid or amido carboxylic acid salt of a group II metal or of aluminum, lithium, copper, iron, cobalt or nickel, and optionally (c) a carboxylic acid or amido carboxylic acid.

Abstract: This invention is a process for preparing polyurethane and/or polyurea elastomer comprising reacting a liquid, preformed isocyanate-terminated prepolymer, which prepolymer is the reaction product of a stoichiometric excess of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive compound, with a chain extender mixture, which chain extender mixture comprises(a) a mixture comprising a hydroxyl-terminated chain extender and an aromatic amine terminated chain extender, and/or an aliphatic amine-terminated compound, or(b) a mixture comprising an aromatic amine-terminated chain extender and an aliphatic amine-terminated compound, wherein the isocyanate index is from about 70 to about 200.In this process, it is possible to prepare elastomers having excellent properties, particularly excellent flexural and thermal properties, which properties are difficult to obtain in a one-step process.

Abstract: Reaction injection molded polyurethanes prepared from a composition comprising (A) a relatively high molecular weight polyol, (B) a chain extender and (C) an aliphatic polyisocyanate or polyisothiocyanate are improved by replacing a portion of the relatively high molecular weight polyol with an aminated or partially aminated polyoxyalkylene material.

Abstract: Reaction injection molded polyurethanes prepared from a composition comprising (A) a relatively high molecular weight polyol, (B) a chain extender and (C) a polyisocyanate or polyisothiocyanate are improved by replacing a portion of the relatively high molecular weight polyol with an aminated or partially aminated polyoxyalkylene material.

Abstract: A composition consisting essentially of (I) at least one polyol having an average of more than 2 hydroxyl groups per molecule and an average hydroxyl equivalent weight of at least about 500 and (II) as a chain extender composition (A) an aliphatic amine-containing material having at least one primary aliphatic amine group per molecule and (B) at least one material selected from (1) hydroxyl-containing materials, or (2) aromatic amine-containing materials.These compounds are useful in preparing polyurethane articles employing reaction injection molding technology.

Abstract: Reaction injection molded polyurethanes are prepared employing a mixture of chain extenders, at least one of which is a hydroxyl-containing compound free of aliphatic amine hydrogen atoms such as, for example, ethylene glycol, or an aromatic amine hydrogen-containing compound which is free of aliphatic amine and at least one of which is an aliphatic amine-containing compound which contains at least one primary amine group such as an aminated polyoxypropylene glycol.