Polyamide-imide-modified polyurethane insulation enamel composit

Details Polyamide-imide-modified polyurethane insulation enamel composit Polyamide-imide-modified polyurethane insulation enamel composit

1995-02-17

1996-05-07

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

525454, 525457, 525458, 525453, 528 60, 528 65, 528 66, 528 80, 528 81, 528 83, 528 84, 528 85, 528 86, 528 73, 528170, 528195, C08J 300, C08K 320, C08L 7500, C08G 1828

Patent

active

055147470

ABSTRACT:
A method for preparing a polyamide-imide-modified polyurethane varnish composition for coating a conductive wire to form a varnished wire. The method comprises the steps of: (a) preparing a first intermediate reaction product, which is an isocyanate compound, (b) preparing a second intermediate reaction product, which is a hydroxy compound, and (c) mixing the first and second intermediate reaction products with a diluent to form the polyamide-imide-modified polyurethane varnish composition. The first intermediate reaction comprises the steps of: (I) preparing a first reaction mixture containing a phenol or a derivative of phenol, a diisocyanate, and a dihydroxy compound in a first organic solvent, and reacting the first reaction mixture at room temperature; (ii) adding a diacid compound or trimellitic anhydride or mixture thereof to the first reaction mixture, and reacting at 100.degree..about.140.degree. C.; wherein the diisocyanate is stoichiometrically equivalent to the sum of the phenol or derivative of phenol, the dihydroxy compound, and the diacid compound or the trimellitic anhydride or mixture thereof. The second intermediate reaction comprises the steps of: (I) preparing a second reaction mixture containing a diisocyanate and a dihydroxy compound in a second organic solvent, and reacting the second reaction mixture at room temperature; (ii) adding a trihydroxyl compound to the second reaction mixture, and reacting at room temperature.

REFERENCES:
patent: 3869428 (1975-03-01), Mosimann et al.
patent: 5310850 (1994-05-01), Chen et al.

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