| 摘要 |
1. A process for the production of optionally cellular elastic moldings having a density of 0.8 to 1.4 g/cm**3 with a compact surface skin of polyurea elastomers optionally containing urethane groups and based on a) di- or polyisocyanates based on diisocyanatodiphenyl methane which are liquid at room temperature, b) solutions of 1-methyl-3,5-diethyl-2,4-diaminobenzene or a mixture thereof with 1-methyl-3,5-diethyl-2,6-diaminobenzene in compounds having an average molecular weight of 1,800 to 12,000 which contain at least two isocyanate-reactive groups and c) optionally the auxiliaries and additives known per se in polyurethane chemistry, components a) to c) being processed as a one-shot system by reaction injection molding and the moldings being demolded after a residence time in the mold of 5 to 60 seconds, characterized in that the diamines present in component b) are used in a quantity which corresponds to a percentage of the diamines in component b) of 34 to 45% by weight and the mold temperature is kept at least 105 degrees C. |
