Reaction injection moulded polyurea elastomers.

摘要

Reaction injection moulded polyurea elastomers are obtained by reacting, in a closed mould, a polyisocyanate, an amine-terminated polyether having an average molecular weight of more than 1500, and having more than 50% of its active hydrogens in the form of amine hydrogens, and an amine-terminated chain extender. The polyisocyanate is an isocyanate-terminated quasi-prepolymer which is the reaction product of an excess of an aromatic polyisocyanate with a polycarbonate polyol and a polyether polyol.