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US 4,070,524 AGranted
Self-bonding varnish for magnetic wire comprising polyalkylenetrimellitate imide polyalkylenetrimellitate ester
AssigneeStandard Oil Company (Indiana)
InventorRobert G. Keske
Life of this patent
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Abstract
Polyalkylenetrimellitate imide polyalkylenetrimellitate ester imides suitable for use as self-bonding varnish coatings for magnet wire, which can be produced by condensation of a trimellitic acid compound, a diprimary amine, an alkanol amine and a glycol.
Claims5
Magnet wire bearing at least one enamel subbing layer selected from the group consisting of polyester, polyester imide, polyimide and polyamide-imide and a continuous self-bonding varnish top coat comprising a polyalkylenetrimellitate imide polyalkylenetrimellitate ester imide having a ratio of from about 1 :
- 19 to 19 :
- 1 of units A and B wherein A and B have the structures:
- ##STR2## and R.sub.1, R.sub.2 and R.sub.3 are independently divalent alkylene radicals.
Dependencies are inferred from the claim text.