Article coated with baked layer of water-soluble heat-resistant

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber

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428383, 428384, 428389, 428458, 428463, 427116, 427118, 427120, 260 292N, 174120C, 174120SR, D02G 300, H01B 344

Patent

active

042084644

ABSTRACT:
A coated article comprising a metal support and a baked layer of a water soluble heat-resistant insulating varnish containing a resin comprising ester groups and imide rings in the molecule dissolved in water using a volatilizable basic compound, the resin comprising the reaction product of
(A) a carboxyl-containing polyesterimide resin having an acid value of about 30 to 150 obtained by reacting (a) a polyhydric alcohol component comprising at least one organic polyhydric alcohol and containing about 10 to 60 mol % of an imide ring-containing glycol of the general formula (I): ##STR1## wherein R.sub.1 is a trivalent aromatic group, R.sub.2 is a divalent organic group, and n is an integer of 1 to 3, with (b) a polycarboxylic acid component comprising at least one trivalent or divalent organic carboxylic acid or the anhydride thereof, where about 30 to 100 mol % of which comprises an aromatic tricarboxylic acid or the anhydride thereof so that the equivalent ratio (OH/COOH) between the polyhydric alcohol component and the polycarboxylic acid component is about 1.0 to 2.0;
(B) 1,2,3,4-butanetetracarboxylic acid or an imide-forming derivative thereof; and
(C) an organic diamine.

REFERENCES:
patent: 3306771 (1967-02-01), Schmidt et al.
patent: 3906139 (1975-09-01), Hiroaka et al.
patent: 3952084 (1976-04-01), Edelman et al.
patent: 4070524 (1978-01-01), Keske
patent: 4116941 (1978-09-01), Hanson

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