C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/110, 402/159
C08G 18/66 (2006.01)
Patent
CA 1314339
Mo-2550-CIP PU-169-CIP STABLE DISPERSIONS, PROCESS FOR PRODUCTION THEREOF AND USE IN THE MANUFACTURE OF POLYURETHANES ABSTRACT OF THE DISCLOSURE The present invention relates to an improved process for the in situ production of stable dispersions of polyureas and/or polyhydrazodicarbonamides in a hydroxyl group containing material selected from the group consisting of polyethers, polyesters, polyester amides, polycarbonates, and mixtures thereof by reacting (a) organic polyisocyanates with (b) a member selected from the group consisting of (i) polyamines containing primary and/or secondary amino groups, (ii) hydrazines, (iii) hydrazides, or (iv) mixtures thereof in (c) said hydroxyl group containing material, wherein said components (a), (b), and (c) are continuously introduced into a flow mixer in such a quantity that the average residence time in the mixer is less than 10 minutes and the reaction product issuing from the flow mixer is subsequently collected in a receiver, the improvement wherein (A) said polyisocyanate (a) is a liquid reaction product of an organic di- and/or polyiso- cyanate and a compound containing at least 1 hydroxy group, said reaction product having an isocyanate group content of from about 5 to about 45% by weight, and preferably from about 25 to 35% by weight, (B) said liquid reaction product and said component (b) are reacted in an isocyanate to amine equivalent ratio of from 0.8:1 to 1.35:1, and Mo-2550-CIP (C) wherein the reaction of components (a), (b), and (c) is conducted in the presence of no more than 4% by weight, and preferably no more than 2% by weight, of water based on the quantity of reaction mixture including water.
515674
Dietrich Manfred
K"onig Klaus
Keegan Richard E.
Aktiengesellschaft Bayer
Dietrich Manfred
K"onig Klaus
Keegan Richard E.
Miles Inc.
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