Patent ID: 6372061
Filing Date: 2002-04-16
Classification: B21B,C22C,C22F,H05K,Y10S

Abstract:
A rolled copper foil for flexible printed circuits consisting essentially of, all by weight, from 0.0100 to 0.0400% of Ag, from 0.0100 to 0.0500% of oxygen, not more than 0.0030% in total of one or more elements selected from the group consisting of S, As, Sb, Bi, Se, Te, Pb, and Sn, and the balance copper, said foil having a thickness in the range of 5 to 50 &mgr;m, a half-softening temperature of 120 to 150Â° C. and retaining a tensile strength of at least 300 N/mm2 at 30Â° C., and possessing excellent flex fatigue property and adequate softening property.