PDA-definition of Polyurea

Definition of Polyurea by the Polyurea Development Association (PDA)
A pure polyurea coating/elastomer is derived from the reaction product of an isocyanate component and a resin blend component such as amine-terminated polymer resins, and/or amine-terminated chain extenders. The isocyanate can be aromatic or aliphatic in nature. It can be a monomer, a polymer, or any variant reaction of isocyanates, a quasi-prepolymer or a prepolymer. The prepolymer, or a quasi-prepolymer, can be made of an amine-terminated polymer resin, or a hydroxyl-terminated polymer resin.

The resin blend must be made up of amine-terminated polymer resins, and/or amineterminated chain extenders. The amine-terminated polymer resins will not have any intentional hydroxyl moieties. Any hydroxyls are the result of incomplete conversion to the amine-treminated polymer resins. The resin blend may also contain additives or nonprimary components. These additives may contain hydroxyls, such as pre-dispersed pigments in a polyol carrier. Normally, the resin blend will not contain a catalyst.