C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/100, 400/550
C08L 75/04 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/30 (2006.01) C08G 18/84 (2006.01) C08L 57/00 (2006.01)
Patent
CA 1077640
Abstract of the Invention The present invention relates to a process for the in situ preparation of stable dispersions of polyisocyanate polyaddition products in hydroxyl-containing compounds as dispersing agents, by a process which comprises reacting 1. organic polyisocyanates with 2. compounds having primary and/or secondary amino groups and/or primary hydroxyl groups and/or ammonia in 3. compounds having at least one hydroxyl group, compounds 3 having secondary hydroxyl groups if compounds 2 have primary hydroxyl groups and wherein the starting com- ponents are reacted together in the presence of more than 4 by weight of water, based on the reaction mixture including water, the process being characterized in that the polyisocyarate polyaddition reaction is carried out in the presence of a polymer latex or in the solution of an ionic, linear polyurethane. If desired, the water is subsequently removed in known manner. The invention also relates to the use of the dispersions made by this process in preparing polyurethane resins.
279862
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