C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/7410
C08L 75/12 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/28 (2006.01) C08K 5/29 (2006.01)
Patent
CA 1111976
PROCESS FOR THE PREPARATION OF AQUEOUS POLYURETHANE DISPERSIONS AND SOLUTIONS ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the preparation of aqueous solutions or dispersions of poly- urethanes, in which process prepolymers which have at least two free isocyanate groups and contain chemically- fixed hydrophilic groups and/or external emulsifiers which are not chemically fixed are reacted with chain lengthening agents in the aqueous phase, characterized in that the isocyanate prepolymer which is hydrophilically modified and/or contains an external emulsifier is mixed with chain lengthening agents selected from the group consisting of azines and hydrazones in the absence of water and the mixture obtained is then mixed with water. The present invention also relates to the dispersions or solutions which can be obtained by this process. Lastly, this invention relates to the use of the dis- persions or solutions which can be obtained by this process for coating flexible substrates.
322155
Grammel Jurgen
Nachtkamp Klaus
Pedain Josef
Aktiengesellschaft Bayer
Sherman
LandOfFree
Process for the preparation of aqueous polyurethane... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the preparation of aqueous polyurethane..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of aqueous polyurethane... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-723701