C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/192, 400/511
C08G 63/06 (2006.01) C08G 63/12 (2006.01) C08L 63/00 (2006.01) C08L 67/02 (2006.01) C09D 163/00 (2006.01) C09D 167/00 (2006.01) H01B 3/30 (2006.01) H01B 3/40 (2006.01) H01B 3/42 (2006.01)
Patent
CA 1068443
ABSTRACT OF THE DISCLOSURE: Process for the preparation of powdered thermosetting coating composition suitable for application as paint or varnish on electricity-conducting articles by powder spray methods and fluidized bed coating processes, which comprises: in a first stage, preparing a branched-chain hydroxyl group-containing polyester from at least one dicarboxylic organic acid, at least one polycarboxylic aromatic acid and at least one dihydric orga- nic compound; in a second stage, esterifying the hydroxyl group-containing polyester thus obtained with an aromatic or hydroaromatic dicarboxylic acid to give a carboxyl group-contain- ing polyester having an acid number which is substantially equal to the hydroxyl number of the hydroxyl group-containing polyester obtained in the first stage; and in a third stage, homogenously mixing the carboxyl group-containing polyester obtained in the second stage with an epoxy compound containing at least two epoxy groups, and optionally adding auxiliary substances conventionally used in the manufacture of powdered paints and varnishes; and powdered thermosetting compositions suitable as paint or varnish obtained by this process.
251268
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