C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
400/7412
C08J 3/02 (2006.01) B01F 5/04 (2006.01) B29B 7/74 (2006.01) B29B 7/94 (2006.01) C08G 18/08 (2006.01) C08J 3/03 (2006.01) C08L 75/04 (2006.01)
Patent
CA 1328945
A PROCESS FOR THE PRODUCTION OF AQUEOUS POLYURETHANE DISPERSIONS ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the continuous production of aqueous polyurethane dispersions, i.e. dispersions or suspensions both of pure polyurethanes and of polyurethane ureas, by mixing a product, which has been obtained by reaction of polyisocyanates with compounds having a molecular weight of 400 to about 10,000 and containing at least two isocyanate-reactive groups, with water, characterized in that the mixing of the polyisocyanate reaction product with water is carried out in a co-current reactor, one of the components to be mixed or a mixture containing one of the two components to be mixed being compressed to an initial pressure of from about 20 to 500 bar and expanded through a coaxially arranged nozzle into the short residence time mixing tube where it is mixed with the other component or with a mixture containing the other component.
574615
Henning Wolfgang
Moormann Gerhard
Petersen Harald
Aktiengesellschaft Bayer
Swabey Ogilvy Renault
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