C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
117/183, 400/541
C08L 75/08 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08G 18/84 (2006.01)
Patent
CA 1102027
ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the preparation of aqueous dispersions or solutions of polyurethanes which have urea end groups and contain non-ionic hydrophilic segments and which are capable of being cross-linked with the aid of cross-linking agents which are reactive with urea groups, characterized in that prepolymers which have isocyanate end groups and which (i) have an average molecular weight of less than about 15,000 and (ii) contain from about 2 to 30%, by weight, of ethylene oxide units corresponding to the following formula: -CH2-CH2-O- within a polyether chain (containing ethylene oxide units) are reacted at from about 10 to 70°C with an aqueous solution of ammonia or with a primary amine, optionally dissolved in water, the aqueous solution of ammonia or the primary amine, optionally dissolved in water, being added to the prepolymer in the reaction vessel and the quantity of water used for dissolving the ammonia or primary amine being not more than about 10%, by weight, based on the total quantity of reaction mixture, and finally, after termination of the addition reaction between the free isocyanate groups of the prepolymer and the added ammonia or primary amine, the reaction product obtained is stirred with water at from about 10 to 70°C to form an aqueous
284063
Dieterich Dieter
Wenzel Wolfgang
Aktiengesellschaft Bayer
Sherman
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