Process for the preparation of cellular or compact polyurethane-polyurea moulded parts with mould release properties, as well as internal mould release agents and their use in the polyisocyanate-polyaddition process

摘要

A process wherein a) organic polyisocyanates, b) relatively high-molecular-weight compounds containing at least two reactive hydrogen atoms, c) aromatic diamines and, if desired, d) further chain extenders and/or crosslinking agents are reacted in the presence of e) an internal mould release agent comprising A) a mixture of i) from 5 to 80 parts by weight of at least one organic amine and/or cyclic lactam, ii) from 20 to 95 parts by weight of at least one metal salt of stearic and/or isostearic acid, and iii) from 0 to 5 parts by weight of a metal salt of an organic mono- and/or dicarboxylic acid, and B) from 0.1 to 200% by weight, based on the total weight of mixture (A), of at least one organic mono- and/or dicarboxylic acid or an anhydride thereof, f) catalysts and, if desired, g) blowing agents, h) assistants and/or additives, as one-shot systems by reaction injection moulding in closed moulds.