C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/79 (2006.01) C08G 18/32 (2006.01) C08G 18/42 (2006.01) C08G 18/66 (2006.01) C09D 5/03 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2296977
The present invention relates to polyaddition compounds, which are solid below 40°C and liquid above 125°C, are prepared by the reaction of an isocyanate component containing uretdione groups with a polyol containing ester and/or carbonate groups, other than hydroxypivalic acid neopentylglycol ester, and have a) an average isocyanate functionality of 2.0 to 8.0 and a content of free isocyanate groups (calculated as NCO; molecular weight = 42) of 2.1 to 6.0 wt.%, b) a content of uretdione groups (calculated as C2N2O2; molecular weight = 84) of 10 to 19 wt.%, c) a content of urethane groups (calculated as -NH-CO-O; molecular weight = 59) of 10 to 17 wt.% and d) a content of ester groups -CO-O (calculated as -CO-O; molecular weight = 44) and/or carbonate groups -O-CO-O (calculated as -CO-O; molecular weight = 44) of 1 to 17 wt.%. The present invention also relates to a process for the preparation of these polyaddition compounds to two-component polyurethane powder coating composi- tions containing these polyaddition compounds as the crosslinking agent and isocyanate-reactive compounds as the binder.
Freudenberg Ulrich
Grahl Michael
Halpaap Reinhard
Laas Hans-Josef
Aktiengesellschaft Bayer
Norton Rose Canada S.e.n.c.r.l.,s.r.l./llp
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