Process for producing copper-clad laminate

Claim 1

A process for continuously producing a copper-clad laminate, comprising the steps of: (A) pre-heating at least one resin-impregnated base of continuous length and at least one copper foil of continuous length under reduced pressure in a vacuum chamber so as to produce a pre-fused laminate material; (B) heat fusing the resulting pre-fused laminate material of Step ()) under reduced pressure in said vacuum chamber so as to form a laminate material; and (C) heating the resulting laminate material of Step (B) between a pair of belts of a double belt press under pressure so as to form said copper-clad laminate, wherein in Step (A), said copper foil is superimposed on at least one outer surface of said base, and wherein said laminate material has a temperature of T 1 , before Step (C); and said laminate material has a maximum temperature of T 2 , during Step (C); and said copper-clad laminate has a temperature T 3 , after Step (C); and wherein the range of temperature change T 2 -T 1 ≦100° C. and T 2 -T 3 ≦100° C., and wherein said copper-clad laminate, while being delivered out of a pressurized cooling zone of said double belt press, has a temperature at least 20° C. higher than a glass transition temperature of said resin.