Epoxy-terminated polyaddition compounds containing uretdione...

Details Epoxy-terminated polyaddition compounds containing uretdione... Epoxy-terminated polyaddition compounds containing uretdione...

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) C08G 18/28 (2006.01) C08G 18/66 (2006.01) C08G 18/79 (2006.01) C08G 59/02 (2006.01) C08G 59/26 (2006.01) C08G 59/32 (2006.01) C08G 65/333 (2006.01) C09D 5/44 (2006.01) C09D 5/46 (2006.01)

Patent

CA 2312462

Disclosed are an epoxy-terminated polyaddition compound containing uretdione groups, obtainable by reacting: A)40-84.5% by weight of at least one polyisocyanate component synthesized from: 1)at least 40% by weight of a polyisocyanate compound containing uretdione groups and having an average functionality of at least 2.0, and 2)not more than 60% by weight of at least one diisocyanate compound or isocyanurate compound without uretdione groups; B)50-15% by weight of at least one compound having at least two hydroxyl groups; and C)10-0.5% by weight of at least one compound having at least one epoxy group and at least one other group which is reactive with an isocyanate group; the polyaddition compound being present in solid form below 40°C and in liquid form above 130°C and having a number-average molecular weight of between 1,000 and 15,000, and a free isocyanate group content (calculated as NCO; molecular weight=42) of from 0 to 2% by weight; a process for preparing it; and its use for preparing polyurethane (PU) polymers, especially a PU powder coating material which crosslinks to highly glossy, light-stable, and weather-stable films having improved chemical resistance.

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