Patent ID: 6306481
Filing Date: 2001-10-23
Classification: G03F,H05K,Y10S,Y10T

Abstract:
A multilayer circuit board with blind via-holes between layers, the via-holes having a resolution in the range of 25-80 .mu.m and an aspect ratio in the range of 2.0-0.6, for making the layers accessible to each other,wherein an insulating layer is provided between said layers, said insulating layer having said blind via-holes, said insulating layer having a glass transition temperature in the range of 150-220.degree. C.,wherein said insulating layer is formed by curing a photosensitive resin composition, andwherein said photosensitive resin composition contains:component (a): 60-90 parts by weight of polyfunctional epoxy resin,component (b): 10-40 parts by weight of resin having phenolic hydroxyl groups,component (c): 3-30 parts by weight of a photo-acid generating agent to 100 parts of total amount of the component (a) and the component (b), andcomponent (d): 1-5 parts by weight of a release agent to 100 parts of total amount of the component (a) and the component (b).