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...
Patent
1997-02-21
1998-09-08
Niland, Patrick D.
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...
524839, 524840, C08J 300, C08K 320, C08L 7500
Patent
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.
Arning Eberhard
Nachtkamp Klaus
Roschu Rolf
Wilmes Oswald
Bayer Aktiengesellschaft
Gil Joseph C.
Niland Patrick D.
Roy Thomas W.
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