Patent ID: 6989406

Claim:
A process for the production of a (polyurea)polyurethane which is oil and petroleum resistant as determined in accordance with DIN EN 344 comprising reacting a mixture comprising A1) a polyether polyol component having a number average molecular weight of from 1000 to 8000 g/mol and a hydroxyl functionality of 2.0 or is substantially a mixture with an average hydroxyl functionality of 2.02 to 2.95 comprising a) at least one polyether diol with a hydroxyl value in the range of 10 to 115 prepared by propoxylation of a difunctional starter compound and subsequent ethoxylation at a ratio by weight of propylene oxide to ethylene oxide of 60:40 to 85:15 and b) at least one polyether triol with a hydroxyl value in the range of 12 to 56 prepared by propoxylation of a trifunctional starter compound and subsequent ethoxylation at a ratio by weight of propylene oxide to ethylene oxide of 60:40 to 85:15, A2) from 3 to 30 wt. %, based on total weight of components A1) and A2), of a polyester polyol component having a number average molecular weight of from 1000 to 6000 g/mol prepared by polycondensation of a) an organic polycarboxylic acid and/or a derivative thereof and b) a polyhydric alcohol, B) a polyisocyanate component, C) a chain extending agent, and optionally, D) a blowing agent and/or E) an additive at an isocyanate index of from 70 to 130.