| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition excellent in flexibility, adherence, heat resistance and the like by admixing an epoxy group-containing thermoplastic elastomer, an aromatic glycidyl ether compound and a photo cation polymerization initiator. SOLUTION: There is provided a composition comprising 3-70 pts.wt. of an epoxy group-containing thermoplastic elastomer (A), 30-97 pts.wt. of an aromatic glycidyl ether compound (B), 0.01-30 pts.wt., based on 100 pts.wt. of (A+B), of a photo cation polymerization initiator (C) such as a diaryl iodonium salt and the like, further 0-50 wt.%, based on the component C, of a photosensitizer such as 9,10-phenylanthracene and the like, not more than 30 wt.%, based on (A+B+C), of an amine-based crosslinking agent, inorganic filler, a colorant and the like. This composition is coated to a thickness of 10-160μm on a circuit board by the screen printing method or the like and dried to obtain a coated film, which is irradiated with ultraviolet rays with a negative film contacted directly therewith, and subsequently the unexposed part is immersed in a developer to effect development followed by heat treatment at 100-200 deg.C to obtain a printed circuit board.
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