Aqueous polyurethane-ureas, a process for their production...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 75/04 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/28 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08G 18/75 (2006.01) C08L 75/02 (2006.01) C09D 175/02 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2198445

The present invention relates to aqueous polyurethane-urea dispersions which are film forming at temperatures of ~ 20°C in the absence of film forming additives, dry at room temperature to yield films having a hardness according to DIN 53 157 (König pendulum hardness) of ~ 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.

La présente invention concerne des dispersions aqueuses de polyuréthane-urée qui sont filmogènes à des températures 20 degrés C en l'absence d'additifs filmogènes, qui sèchent à la température de la pièce pour donner des films d'une dureté selon la norme DIN 53 157 (dureté au pendule de König) 100 secondes, dans lesquelles les polyuréthane-urées ont une teneur en groupes uréthane (calculée sous forme de -NH-CO-O-, poids moléculaire 59) de 7 à 20 % en poids, et une teneur en groupes urée (calculée sous forme de -NH-CO-N, poids moléculaire 57) de 5 à 8 % en poids, et qui contiennent 15-70 % en poids, par rapport aux solides de la résine, de motifs structuraux préparés par incorporation de 1-méthyl-2,4- et/ou -2,6-diisocyanatocyclohexane sous forme de groupes uréthane et/ou urée. La présente invention concerne également un procédé de production de ces dispersions aqueuses de polyuréthane-urée et leur utilisation dans les compositions de revêtement.

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