Reinforced polyurethane/urea elastomers and molded articles produced therefrom

A reinforced polyurethane/urea having a urea group content of from about 70 to about 95 mol. % (based on total mol % of reacted NCO groups) and a urethane group content of from about 5 to about 30 mol. % (based on total mol % of reacted NCO groups) comprising. the reaction product of a reaction mixture compnsing:

• (1) an A-component comprising:
• A1) at least one aromatic diamine which has an alkyl substituent in at least one ortho-position to each of the amino groups,
• A2) an aliphatic reaction component which includes at least one polyether polyol which (i) contains hydroxyl and/or primary amino groups;
• (ii) has a number average molecular weight of from 500 to about 18,000;
• (iii) has a functionality of from 2 to 8;
• (iv) has an ethylene oxide content of from 40 to 100% by weight;
• and (v) an alklyoxirane content of from 0 to 60% by weight,
• A3) optionally, an aliphatic amine,
• A4) at least one reinforcement material and
• A5) optionally, one or more catalysts and/or additives,
• A6) optionally, a metal salt mold release agent and
• (2) a B-component comprising a prepolymer produced from
• B1) a polyisocyanate component comprising a liquefied polyisocyanate or polyisocyanate mixture from the diphenylmethane series and
• B2) a polyol component with a number average molecular weight of from 500 to 18,000 comprising at least one polyether polyol which (i) has a functionality of from 2 to 8;
• (ii) an ethylene oxide content of less than 40% by weight;
• (iii) an alkyloxirane content of greater than 60% by weight;
• and (iv) optionally contains an organic filler,
• in amounts such that (i) the elastomer has an isocyanate index of from 80 to 120 and (ii) polyol component B2) introduced via the B-component represents 10 to 90 mol. % of the urethane content of the elastomer.