Low viscosity polyester coating compositions
AssigneeWestinghouse Electric Corp.
InventorDaniel R. Sassano
Life of this patent
Estimating the term…
Abstract
A fluid, polyester insulating composition is made by admixing: (A) about 15 mole % to about 40 mole % of unsaturated cyclic dicarboxylic acid; (B) about 5 mole % to about 20 mole % of an unsaturated aliphatic dicarboxylic acid; (C) about 35 mole % to about 60 mole % aliphatic dihydric alcohol; (D) about 25 mole % to 35 mole % copolymerizable monomer; and (E) an active dual inhibiting agent combination of hydroquinone and mono tert butyl hydroquinone, and up to about 10 parts by weight melamine per 100 parts by weight polyester.
Claims6
A fluid, thermally stable, solventless, insulating composition, useful as a dipping and impregnating resin, consisting essentially of:
- (1) 100 parts by weight of a polyester composition consisting of the admixture of:
- (A) about 15 mole % to about 40 mole % of unsaturated cyclic dicarboxylic acid selected from the group consisting of isophthalic acid, tetrahydrophthalic acid, endo methylene tetrahydrophthalic acid, their anhydrides and their mixtures;
- (B) 5 mole % to 20 mole % of an unsaturated aliphatic dicarboxylic acid;
- (C) about 35 mole % to about 60 mole % of neopentyl glycol as sole aliphatic dihydric alcohol;
- (D) 25 mole % to 35 mole % of copolymerizable unsaturated vinyl monomer;
- (E) from 0 mole % to about 20 mole % of tris (2 hydroxy alkyl) isocyanurate, where alkyl is from 2 to 6 carbon atoms;
- and
- (F) an active, dual inhibiting agent combination consisting of:
- (i) 200 ppm. to 300 ppm. hydroquinone, and
- (ii) 60 ppm. to 120 ppm. mono tert butyl hydroquinone and including an effective amount of solubilizer for the inhibiting combination;
- said polyester composition having a viscosity of from about 500 cps. to about 1,750 cps. at 25.degree. C.;
- and
- (2) from 0 parts to about 10 parts by weight of a melamine-formaldehyde compound.
Dependencies are inferred from the claim text.