Patent ID: 8118970

Claim:
A process for production of a soft magnetic metal strip laminate that includes a plurality of soft magnetic metal strips laminated by using a polyamide acid solution, wherein the alloy composition of the soft magnetic metal strips is represented by T a Si b B c C d (T is an element that includes at least one of Fe, Co, and Ni, and a+b+c+d=100%), and it is preferable that the soft magnetic metal strip is an amorphous alloy that includes 79≦a≦83%, 0<b≦10%, 10≦c≦18%, 0.01≦d≦3% and an inevitable impurity on the basis of atomic %, the process comprising the steps of: applying the polyamide acid solution on the soft magnetic metal strip; performing a first heat treatment for drying the soft magnetic metal strip to obtain the degree of imidization of the polyamide acid solution which is in the range of 15 to 70% after the step of performing the first heat treatment, laminating a plurality of soft magnetic metal strips to each other with the polyamide acid solution; and after the step of laminating the plurality of soft magnetic strips, performing a second heat treatment for heating the laminated soft magnetic metal strips to obtain the degree of imidization of the polyamide acid solution which is more than 90%.