C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
402/159, 260/228
C07C 265/14 (2006.01) C07C 265/04 (2006.01) C07H 13/04 (2006.01) C08G 18/77 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2021716
The present invention relates to polyisocyanates which contain ester groups and have a) a content of aliphatically bound isocyanate groups of 18 to 33% by weight, b) an average NCO functionality of 4.1 to 10, preferably from 4.5 to 10, and c) a viscosity of 200 to 2,500 mPa.s at 22°C. The present invention also relates to preferred polyisocyanates which contain ester groups and have a) a content of aliphatically bound isocyanate groups of 20 to 33% by weight, b) an average NCO functionality of 5 to 8 and c) a viscosity of 500 to 1,000 mPa.s at 22°C. The present invention further relates to a process for the preparation of these preferred polyisocyanates by reacting isocyanatocarboxylic acid chlorides with 0-silylated, polyhydric alcohols at a temperature of about 50 to 150°C. Finally, the present invention relates to the use of the polyisocyanates as the isocyanate component for two-component polyurethane coating compositions.
Kahl Lothar
Nachtkamp Klaus
Pedain Josef
Schmalstieg Lutz
Schonfelder Manfred
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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