Aqueous polyurethane-ureas, a process for their production and t

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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524839, 524840, C08J 300, C08K 320, C08L 7500

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active

058046470

ABSTRACT:
The present invention relates to aqueous polyurethane-urea dispersions which are film forming at temperatures of .ltoreq.20.degree. C. in the absence of film forming additives, dry at room temperature to yield films having a hardness according to DIN 53 157 (Konig pendulum hardness) of .gtoreq.100 seconds, in which the polyurethane-ureas have a urethane group content (calculated as --NH--CO--O--, molecular weight 59) of 7 to 20 wt. %, and a urea group content (calculated as -NH-CO-N, molecular weight 57) of 5 to 18 wt. %, and contain 15-70 wt. %, based on resin solids, of structural units prepared by incorporating 1-methyl-2,4- and/or -2,6-diisocyanatocyclohexane in the form of urethane and/or urea groups. The present invention also relates to a process for the production of these aqueous polyurethane-urea dispersions and to their use in coating compositions.

REFERENCES:
patent: 5194487 (1993-03-01), Jacobs
patent: 5212230 (1993-05-01), Tirpak et al.
Houben-Weyl, Methoden Der Organischen Chemie, 4th edition vol. E 20, p. 1659 (month unavailable) 1987.
J. W. Rosthauser and K. Nachtkamp in Advances in Urethane Science and Technology, K.C. Frisch and D. Klempner editors, vol. 20, pp. 121-162 (month unavailable) 1987.
D. Dietrich, K. Uhlig in Ullmann's Encyclopedia of Industrial Chemistry, vol. A21, p. 677 (month unavailable) 1992.

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