C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/04 (2006.01) B05D 1/36 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/66 (2006.01) C08G 18/80 (2006.01) C09D 175/04 (2006.01) C09D 175/06 (2006.01)
Patent
CA 2127761
An aqueous dispersion of polyurethane resins free from urea groups and containing ionic groups and with a number average molecular weight (Mn) of 10 000 to 300 000 and an acid number of 5 to 50, and a method of manufacturing them by preparing a polyurethane prepolymer containing OH groups and with an OH number of 5 to 75 and a number average molecular weight (Mn) of 5 000 to 50 000, by reacting the following in an organic medium: A) one or more compounds which react with isocyanate and have an acid number of 0 to 10; B) one or more substances containing free isocyanate groups; C) one or more polyisocyanates with at least two free isocyanate groups per molecule, in a proportion such that the molar ratio of the OH groups in component A) to the NCO groups in components B) and C) is 1.01 : 1 to 3 : 1, after which the prepolymer obtained from A), B) and C), before or after partial or complete neutralisation of any groups present which are convertible into ionic groups, is subjected to a chain-lengthening process in the organic medium or after conversion to the aqueous phase, by reaction with D) one or more polyfunctional isocyanates with a functionality of free NCO groups of at least 1.8, in proportions such that the final polyurethane resin has the desired number average molecular weight.
Gobel Armin
Patzschke Hans P.
E.i. Du Pont de Nemours And Company
Gobel Armin
Kirby Eades Gale Baker
Patzschke Hans P.
LandOfFree
An aqueous dispersion of polyurethane resins, a method of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with An aqueous dispersion of polyurethane resins, a method of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An aqueous dispersion of polyurethane resins, a method of... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1692119