C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/00 (2006.01) C08G 18/32 (2006.01) C08G 18/72 (2006.01) C08G 18/79 (2006.01)
Patent
CA 2163592
The present invention is directed to coating compositions which have long pot lives and may be rapidly cured under ambient conditions to provide coatings with improved optical properties and resistance to yellowing, such coating compositions containing as binder a) a polyisocyanate component containing i) ~5 to 100 % by weight of a polyisocyanate adduct containing uretdione groups and ii) ~0 to 95% by weight of a monomeric polyisocyanate, an NCO prepolymer or a polyisocyanate adduct other than i), and b) an aldimine based on the reaction product of a polyamine having 2 or more primary amino groups with an aldehyde corresponding to the formula: O=CHCH(R1)(R2) wherein R1 and R2 may be the same or different and represent optionally substituted hydrocarbon radicals, or R1 and R2 together with the .beta.-carbon atom form a cycloaliphatic or heterocyclic ring, wherein components a) and b) are present in an amount sufficient to provide an equivalent ratio of isocyanate groups to aldimine groups of 0.5:1 to 20:1.
Hicks Sharon D.
Hunter John H.
Wicks Douglas A.
Corporation Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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