ELECTROLYTIC COPPER FOIL AND COPPER CLAD LAMINATE USING THE ELECTROLYTIC COPPER FOIL

摘要

PROBLEM TO BE SOLVED: To provide an electrolytic copper foil for solving the problems of warpage, twist, and dimensional stability of a copper-clad laminate clad with the electrolytic copper foil and to provide an inspection method for insuring quality. SOLUTION: The electrolytic copper foil used has such properties that when the electrolytic copper foil having such low-temperature annealability that the crystal structure of a copper-clad laminate using the electrolytic copper foil is recrystallized by the heat hysteresis accumulated in producing the laminate and exhibiting an elongation as high as 18% or higher in a hot atmosphere at 170°C is subjected to an age hardening heat treatment in a hot atmosphere of 170°C, the maximum rate of decrease in the maximum tensile strength falls within the range of the age hardening heat treatment time of 5 to 10 min and the amount of change in the tensile strength calculated from the tensile strength values at age hardening heat treatment times of 5 min and 10 min in the hot atmosphere of 170°C in a [tensile strength] vs. [age hardening time] curve where the ordinates represent tensile strengths, and the abscissae represent age hardening times is 3 kg/mm2or larger. COPYRIGHT: (C)2004,JPO