Showa Denko K.k.

Yoshio Miyajima

Hiroshi Uchida

Kenji Tamura

Katsutoshi Morinaka

Motoyuki Hirata

Satoru Ishigaki

There are provided a novel photosensitive resin composition, a cured film of which has ample flexibility, and which yields an insulating protective coating having superior soldering heat resistance, thermal degradation resistance and electroless gold plating resistance. The photosensitive resin composition as claimed in the present invention comprises: a photopolymerizable component containing a urethane acrylate compound (A) and a compound (B) having an ethylenic unsaturated group other than said urethane acrylate compound (A), a thermosetting resin (C), a photopolymerization initiator (D) and a thermal polymerization catalyst (E); wherein, said urethane acrylate compound (A) is the reaction product of an isocyanate compound (a-1) of the following general formula (1):CH&#x2550;CH&#x2014;COO&#x2014;R&#x2014;NCO&#x2003;&#x2003;(1)(wherein, R represents a hydrocarbon group having 1 to 30 carbon atoms) with a polyhydroxy compound (a-2).

Photosensitive resin composition, cured product thereof and production method of printed circuit board using the same

A phosphorus-containing urethane (meth)acrylate compound obtained by reacting (A) a polyol compound comprising (A1) a phosphorus-containing polyol having a phosphorus atom, with (B) a bifunctional or greater polyisocyanate and (C) a hydroxyl group-containing (meth)acrylate.

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Kawasaki, Japan

Yoshio Miyajima