Editing Polyurea (section)

{{distinguish|Polyuria}}
{{Short description|Class of elastomers}}
[[File:Polyurea.svg|thumb|300px]]

'''Polyurea''' is a type of [[elastomer]] that is derived from the reaction product of an [[isocyanate]] component and an [[amine]] component. The [[isocyanate]] can be [[aromatic]] or [[aliphatic]] in nature. It can be [[monomer]], [[polymer]], or any variant reaction of isocyanates, quasi-prepolymer or a [[prepolymer]]. The prepolymer, or quasi-prepolymer, can be made of an [[amine]]-terminated polymer resin, or a [[hydroxyl]]-terminated polymer resin.<ref>{{Cite journal|last=Howarth|first=G.A|date=2003|title=Polyurethanes, polyurethane dispersions and polyureas: Past, present and future|journal=Surface Coatings International Part B: Coatings Transactions|volume=86|issue=2|pages=111–118|doi=10.1007/BF02699621|s2cid=93574741}}</ref>

The resin blend may be made up of amine-terminated polymer resins, and/or amine-terminated chain extenders. The amine-terminated polymer resins do not have any intentional hydroxyl [[Moiety (chemistry)|moieties]]. Any hydroxyls are the result of incomplete conversion to the amine-terminated polymer resins. The resin blend may also contain additives or non-primary components. These additives may contain hydroxyls, such as pre-dispersed [[pigments]] in a [[polyol]] carrier. Normally, the resin blend does not contain a [[catalyst]](s). This is because the reaction between an isocyanate and amine is extremely fast and hence does not need catalysis.