Hitachi Chemical Company, Ltd.

Shinji Ogi

Atsushi Takahashi

Kazunori Yamamoto

Ken Nanaumi

Takao Hirayama

Akinari Kida

Toshihiko Ito

Koji Morita

Hiroaki Hirakura

Kiyoshi Hirosawa

Provided is bonding film for printed circuit boards which is resistant to cracking even when bent with a small radius of curvature, has a sufficient mechanical strength even in its semi-cured state so that the handling may be facilitated, is not undesirably brittle and therefore does not produce undesired debris when cut, and is flexible and flame retardant at the same time. The bonding film may consist of (i) high polymer epoxy resin; (ii) denatured polyamide obtained by reacting epoxy resin and polyamide; (iii) polyfunctional epoxy resin; and (iv) curing agent. Preferably, the denatured polyamide includes a polyalkylene-glycol residue or a polycarbonate-diol residue. Preferably, the high polymer epoxy resin is produced by the polymerization of bifunctional epoxy resin and bifunctional phenol resin, and has a weight averaged molecular weight equal to 50,000 or higher.

Bonding film for printed circuit boards

Growing community of inventors

Yuki, Japan

Shinji Ogi