B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
117/113, 117/195
B05D 3/02 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/40 (2006.01) D06N 3/14 (2006.01)
Patent
CA 1333140
The present invention is directed to a process for coating substrates with polyurethane ureas which is characterized in that a substrate is coated with a product, which has been obtained by the reaction of A) a prepolymer based on an aromatic polyisocyanate containing on average two ketoxime-blocked NCO groups and having an average molecular weight of about 500 to 15,000 with B) a chain-extending agent corresponding to the formula H2N-R'-NH2 in which R' is an aliphatic or cycloaliphatic radical, in the presence of solvents at temperatures above 50°C and at an equivalent ratio of blocked NCO groups to NH2 groups of 1.43 to 1.02, wherein after about 40 to 90% of the available amino groups have reacted, the reaction is completed with crosslinking at temperatures above 120°C. The present invention is also directed to the coated substrates produced by this process.
587608
Kling Waldemar
Pedain Josef
Thoma Wilhelm
Aktiengesellschaft Bayer
Swabey Ogilvy Renault
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