Nippon Steel Chemical Co., Ltd.

Nippon Steel Corporation

Unitika Ltd.

Shinji Inaba

Masao Kimura

Hiroshi Ohishi

Koichi Fujishiro

Masanao Kawabe

Kazuhiko Mizuuchi

Takumi Tanaka

Souichiro Kishimoto

Keizo Kyuda

Akio Motoyama

Takamasa Owaki

Koji Nakamura

This invention relates to an insulating resin composition which exhibits high impact resistance and heat resistance and good adhesiveness to the plating metal, is selectively etchable by a permanganate salt commonly used in a plating operation and suited for an insulating layer in multilayer wiring boards. The insulating resin composition is a photo-polymerizable or thermally polymerizable resin composition comprising 3-10 parts by weight of a crosslinked elastic polymer per 100 parts by weight of a resin component (excluding the crosslinked elastic poly and including monomers) and said crosslinked elastic polymer has carboxyl groups and is dispersed with an average secondary particle diameter in the range of 0.5-2 &mgr;m.

Insulating resin composition and laminate obtained therefrom

A process is disclosed for preparing of aromatic polyester-polystyrene block copolymers which comprises subjecting preferentially styrene polymers (A) having terminal functional groups reactive with acid chloride groups and an excess of aromatic dicarboxylic acid dihalides (C) to condensation and then subjecting continuously the resultant mixture and aromatic dihydroxy compounds (B) to interfacial polymerization at the ratio (A)/[(B)+(C)] by weight of 5/95 to 80/20, without separating reaction products of styrene polymers (A) and aromatic dicarboxylic acid dihalides (C), and the block copolymers thus prepared contain a small amount of uncopolymerized styrene polymers, have long aromatic polyester segments, show low birefringence, good transparency, exceptionally low birefringence, low melt viscosity, and good mechanical strength, and are particularly useful as materials for optical instruments.

Process for preparing aromatic polyester-polystyrene block copolymers

A process is disclosed for the preparation of aromatic polyester-polystyrene block copolymers by solution polycondensation of styrene polymers (A) having terminal functional groups reactive with acid halide or hydroxyl groups, aromatic dihydroxy compounds (B), and aromatic dicarboxylic acid dihalides (C) at (A)/[(B)+(C)] (by weight) of 5/95 to 80/20 and the polymers are suitable as molding materials for optical instruments for their good transparency, particularly low birefringence, low melt viscosity, and good mechanical strength.

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Kawasaki, Japan

Shinji Inaba