Patent ID: 6376073
Filing Date: 2002-04-23
Classification: C08G,C09D,H01B,Y10T

Abstract:
A high frequency-resistant enamelled wire, comprising a metal conductor as a core and a coating layer superimposed on the core, wherein said coating layer comprises thermosetting polyurethane coating comprising a block diisocyanate component and an esterified polyol component which is produced by mixing said block diisocyanate and said esterified polyol in a ratio of 1:1 to 1:2.5, wherein said block diisocyanate component comprises a diisocyanate, a methylol alkane, and a tertiary amine, wherein the molar ratio between the diisocyanate and methylol alkane is 0.7 to 1.3:0.1 to 0.6, and said esterified polyol component comprises a terephthalate, an anhydride, p,pâ€²-diaminodiphenylmethane, and at least one polyol in a molar ratio of 0.7 to 1.3:0.7 to 1.3:0.3 to 0.7:2 to 4, said coating layer having a thickness sufficient to impart a high frequency resistance to the wire such that it can withstand a carrier frequency of up to 15 kHz and a voltage of up to 622 V for a period of time, said thickness being from 85 to 120 &mgr;m.