Process for the production of patent leather and patent...

Details Process for the production of patent leather and patent... Process for the production of patent leather and patent...

C - Chemistry, Metallurgy

14

C

117/195

C14C 11/00 (2006.01) C08G 18/12 (2006.01) C08G 18/42 (2006.01)

Patent

CA 1332037

PROCESS FOR THE PRODUCTION OF PATENT LEATHER AND PATENT LEATHER PREPARED THEREFROM ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the production of high-gloss patent leather from two-component poly- urethane compositions by reacting hydroxyl group-containing oligourethanes with polyisocyanates, characterized in that the oligourethanes have been synthesized from A) at least 2 marcrodiols in a molar ratio of about 1:6 to 6:1 wherein 1) the first macrodiol has an average molecular weight of 254 to about 650 and contains an aromatic ring or a saturated or unsaturated cycloaliphatic ring and 2) the second macrodiol has an average molecular weight of about 1,200 to 3,000, provided that the molecular weight of macrodiol A/2 is at least 3 times the molecular weight of macrodiol A/1, and B) at least one diisocyanate, wherein the macrodiol:diisocyanate molar ratio is about 1.0:0.9 to 1.0:0.3. The present invention is also directed to the high- gloss patent leather prepared in accordance with the above process.

603022

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