Functionalized polyurethane polyurea dispersions
The present invention relates to aqueous polyurethane urea dispersions having integral functional groups and coating agents produced therefrom, to a method for the production thereof, and to the use thereof for producing coating agents.
1. An aqueous polyurethane polyurea dispersion, comprising structural units of formula (I)
in which
R′═(CH 2 ) n O and (CH 2 ) n , wherein n=1 - 10 and n=integer,
R″═(CH 2 ) n O and ( CH2 ) n , wherein n=1 - 10 and n=integer,
R′″═H, CH 2 CH 2 SO 3 31 , CH 3 , CH 2 CH 3 , cyclohexyl, CH 2 CH 2 OH.
2. Aqueous polyurethane polyurea dispersion according to claim 1 , comprising as structural components
a) one or more polyisocyanate compounds having a functionality ≧2,
b) one or more polyhydroxy compounds having a molar mass M n of from 400 to 8000 g/mol and a functionality of from 1.5 to 6,
c) optionally one or more polyhydroxy compounds having a molar mass <400 g/mol and a functionality of from 2 to 4,
d) one or more non-ionic, isocyanate-reactive hydrophilising agents,
e) one or more isocyanate-reactive, potentially ionic hydrophilising agents,
f) one or more polyamines having a molar mass of from 32 to 400 g/mol and a functionality of from 1 to 3, and
g) one or more isocyanate-reactive polyepoxide compounds having an epoxide functionality ≧2.
3. Aqueous polyurethane polyurea dispersion according to claim 2 , characterised in that wherein component b) is polyester polyols based on butanediol and/or neopentyl glycol and/or hexanediol and/or ethylene glycol and/or diethylene glycol with adipic acid and/or phthalic acid and/or isophthalic acid.
4. Aqueous polyurethane polyurea dispersion according to claim 2 , characterised in that wherein component g) has an epoxide functionality of from 2 to 4 and an isocyanate-reactive functionality of 1.
5. Aqueous polyurethane polyurea dispersion according to claim 2 , characterised in that wherein component g) has an epoxide functionality of 2 and an isocyanate-reactive functionality of 1.
6. Aqueous polyurethane polyurea dispersion according to claim 2 , characterised in that wherein said dispersion is capable of being used together with one or more hydrophilic polyisocyanates, polyamines, polyepoxides or melamines in a 2K system.
7. Process for the preparation of the aqueous polyurethane polyurea dispersion according to claim 1 , characterised in that wherein an isocyanate- and epoxy-group-containing polyurethane prepolymer is first prepared by reaction of components a), b), c), d), e) and g) and, in a further step, the polyurethane prepolymer is chain-extended with NH 2 - and/or NH-functional components e) and f) and converted into the aqueous phase.
8. A polyurethane polyurea dispersion according to claim 1 suitable for use in the preparation of a coating composition for wood, plastics, metal, glass, textiles, leather, paper and fibres.
9. An aqueous polyurethane polyurea dispersion according to claim 1 suitable for use in the production of thermally self-crosslinking 1K systems.
10. An aqueous polyurethane polyurea dispersion according to claim 1 suitable for use in the production of 2K systems.
11. 1K system comprising an aqueous polyurethane polyurea dispersion according to claim 1 .
12. 2K system comprising aqueous polyurethane polyurea dispersion according to claim 1 and at least one water-soluble or water-dispersible crosslinker.