Compositions of matter used as reaction systems in RIM processes. Useful for the production of polymeric materials such as molded articles. The articles comprise the product of the reaction of an aromatic isocyanate with an imino-functional isocyanate-reactive composition.

Improved reinforced polyurethane/urea articles are made by reacting an organic polyisocyanate with low viscosity imino/enamine-functional compounds in contact with fiberous reinforcing agents.

A polyisocyanate composition, suitable for use in the production of elastomers by the RIM process, or foams, said composition being the product of reacting an imino-functional or enamine-containing compound having a molecular weight of at least 1000 with a stoichiometric excess of an organic polyisocyanate.

A method of making a reaction injection moulded elastomer which includes injecting into a mould cavity a reaction mixture including: (A) an organic polyisocyanate, and (B) an isocyanate-reactive composition comprising the reaction product of: (a) the reaction product of a polyol or polythiol having an average hydroxyl or thiol functionality of from about 1.5 to about 6 and an average molecular weight of from about 100 to about 12,000 and an acylating agent, and (b) a polyfunctional compound which is capable of reacting with reactant (a) to provide a product containing a plurality of isocyanate-reactive groups.

Improved sealants and adhesives derived from polyisocyanates having aromatically linked -NCO groups are cured at ambient temperatures when combined with a curing agent comprising an imino- and enamino-functional compound. These two component resin systems may be employed in fabricating multi-substrate laminates, especially those comprising lignocellulosic and cellulosic materials, such as wood and paper.