| 摘要 |
PROBLEM TO BE SOLVED: To obtain a prepreg that has excellent ultraviolet shielding properties and does not deteriorate other properties required for a laminate for a printed wiring board such as water resistance, heat resistance, solvent resistance and electrically insulating properties by constituting a matrix resin of a resin containing a partially crystallized glass with a specified crystallinity. SOLUTION: A prepreg for a printed wiring board is obtained by impregnating a matrix resin that contains 60-200 pts.wt., based on 100 pts.wt. of a resin including a curing agent, of a partially crystallized glass with a crystallinity of 5-20 wt.% in a glass base material. In the production of the prepreg for a printed wiring board, 5-40 wt.% of one or more of a calcium carbonate, a dolomite, a talc and a calcium silicate are added to and mixed with E-glass and thereafter calcined at a temperature of 700-1,050 deg.C to obtain a partially crystallized glass with a crystallinity of 5-20 wt.%. The partially crystallized glass is kneaded with a resin to form a matrix resin. The matrix resin is impregnated in a glass base material.
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