C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/157, 117/195
C08G 18/79 (2006.01) C08G 18/80 (2006.01) C09D 5/46 (2006.01) C09D 175/04 (2006.01)
Patent
CA 1293838
A POWDER LACQUER AND ITS USE FOR COATING HEAT-RESISTANT SUBSTRATES ABSTRACT OF THE DISCLOSURE The present invention relates to a powder lacquer containing a mixture of A) a polyisocyanate component in powder form which is solid below about 40°C and liquid above about 150°C and B) a organic polyhydroxyl component in powder form which is solid below about 40°C and liquid above about 150°C, components A) and B) being present in quantities corresponding to an equivalent ratio of isocyanate groups to hydroxyl groups of about 0.6:1 to 1.2:1, characterized in that component A) is based on a polyisocyanate or polyisocyanate mixture which a) does not contain any blocking agents for isocyanate groups, b) has a content of free isocyanate groups (expressed as NCO) attached to tertiary, aliphatic or cyclo- aliphatic carbon atoms of about 8 to 24% by weight and an average NCO functionality of at least 2.1, c) has a urethane group content (expressed as -NH-CO-O-) of about 3 to 30% by weight and d) has an isocyanurate group content (expressed as C3N3O3) of 0 to about 30% by weight. The present invention also relates to the use of this powder lacquer for the production of coatings on heat-resistant substrates by methods known in powder lacquer technology.
542494
Arlt Dieter
Halpaap Reinhard
Klein Gerhard
Kreuder Hans-Joachim
Pedain Josef
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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