Polyurea elastomers with reduced brittleness

Details Polyurea elastomers with reduced brittleness Polyurea elastomers with reduced brittleness

C - Chemistry, Metallurgy

08

G

402/166, 403/50,

C08G 71/02 (2006.01) C08G 18/10 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08J 9/00 (2006.01) C08L 75/02 (2006.01)

Patent

CA 2017811

Mo-3175 PU-251 POLYUREA ELASTOMERS WITH REDUCED BRITTLENESS ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the production of optionally cellular, polyurea elastomer moldings by reacting a mixture containing I) a polyisocyanate component having an isocyanate content of about 10 to 30% by weight which comprises an isocyanate-terminated prepolymer prepared by reacting a polyisocyanate with a non-fatty, hydroxy polyester having a hydroxyl functionality of 1 to 4 and a molecular weight of about 500 to 4000, provided that if the hydroxy polyester is based on an aliphatic monocarboxylic acid, the aliphatic monocarboxylic acid is a non-fatty monocarboxylic acid containing less than 12 carbon atoms, II) a polyether having at least two isocyanate-reactive groups and a molecular weight of 1800 to 12,000 in which at least 50% of the isocyanate-reactive groups are primary and/or secondary amino groups, and III) about 5 to 50% by weight, based on the weight of component (II) of a chain extender comprising a sterically hindered aromatic diamine, the reaction mixture being processed as a one-shot system by the RIM process at an isocyanate index of about 70 to 130. The present invention is also directed to these optionally cellular, polyurea elastomer moldings. Mo-3175

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