A term applied when two or ore substances polymerize at the same time to yield a product, which is not a mixture of separate polymers but a complex having properties different from either polymer.

The process of using more than one type of monomer in the production of a polymer , resulting in a product with properties different from either monomer. See monomer, polymer.

A chemical reaction that results in the bonding of two or more dissimilar monomers to product large, long-chain molecules which are copolymers.

Often called catalyzed or two component urethanes, these cure by the addition of a co-reactant (catalyst) to the isocyanate-containing component. Mixing, induction time, and pot life vary according to the type of isocyanate and catalyst used.