C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/08 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08G 18/80 (2006.01) C08K 7/00 (2006.01) C08K 7/14 (2006.01)
Patent
CA 2088610
Mo3848 LeA 28,866 PROCESS FOR THE PREPARATION OF MOLDED PRODUCTS ABSTRACT OF THE DISCLOSURE A process for the preparation of molded products which are particularly readily recyclable. These molded products have a density of from 0.8 to 1.4 g/cm3, and are based on polyurethanes containing urea groups. The process comprises reacting, in one-stage or two-stages via the reaction injection molding technique, a) a polyisocyanate component comprising a polyisocyanate or polyisocyanate blend of the diphenylmethane series, having an NCO functionality of from 2.0 to 2.2, and an NCO content of from 8 to 32 % by weight; b) a polyol comprising at least one polyether polyol having a hydroxyl functionality of 2.5 to 3.5 and a hydroxyl number of from 35 to 50 mg KOH/g, wherein each polyether polyol contains from 5 to 19% by weight, based on the weight of the polyether polyol, of ethylene oxide blocks grafted in the end position; with c) sterically hindered aromatic diamines as chain extenders; in the presence of d) catalysts, and e) from 0.1 to 10% by weight, based on the weight of component b), of additives. In particular, the additives comprise aliphatic polyether amines within the molecular weight range 200 to 800, ethylenediamine propoxylation products with a hydroxyl number in the range of 200 to 1200 mg KOH/g, esterification products of 1,6-hexanediol with ricinoleic acid, or mixtures thereof. The process may also contain other auxiliary substances and additives, such as, for example, milled glass fiber or glass flakes. Mo3848
Liman Ulrich
Raßhofer Werner
Wagner Joachim
Weber Christian
Aktiengesellschaft Bayer
Swabey Ogilvy Renault
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