Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1987-04-14
1988-04-26
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
525438, 528296, C08G 6302, C08G 6376, C08F28300
Patent
active
047405805
ABSTRACT:
The present invention provides a process for the preparation of carboxyl group-terminated polyesters, which comprises reacting in one step at elevated temperatures, terephthalic acid and at least one dihydric aliphatic compound and optionally an aromatic polycarboxylic acid having three or more carboxyl groups and/or a polyhydric organic compound having three or more hydroxyl groups and/or a linear aliphatic or cycloaliphatic dicarboxylic acid, the proportions by weight of the respective reactants being such as to produce a polyester having an acid number of from 10 to 25 mg KOH/g and a hydroxyl number of at most 5 mg KOH/g.
The present invention also provides a process for preparing a powdered thermosetting coating composition suitable for application as paint or varnish on electricity-conducting articles by electrostatic powder spray methods and fluidized bed coating processes, wherein the carboxyl group-terminated polyester prepared as described above is homogeneously mixed with and epoxy compound containing at least two epoxy groups. The present invention further provides the compositions thus prepared.
REFERENCES:
patent: 4442269 (1984-04-01), Sommerfeld et al.
patent: 4528341 (1985-07-01), Belder et al.
patent: 4605710 (1986-08-01), Guilbert
patent: 4621122 (1986-11-01), Guilbert et al.
Loutz Jean-Marie
Maetens Daniel
Merck Yves
Phynes Lucille M.
U C B S.A.
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