Mitsubishi Rayon Company, Limited

Toshihiro Hattori

Hisashi Tada

Masahiro Sugimori

Kazuya Goto

Takeshi Kato

Akira Agata

Takashi Murata

Shigetsugu Hayashi

Ikuo Takiguchi

Hajime Gotoh

Setsuo Kashiyama

Shiro Asada

Tadasi Yokochi

Yukihiro Sumikawa

A prepreg for fiber-reinforced composite materials comprising (A) a reinforcing fiber having a modulus of elasticity of 200 GPa or more, (B) a fibrous thermoplastic resin having a modulus of elasticity of 100 GPa or less, and (C) a thermosetting matrix resin. The prepreg of the present invention does not only have excellent handling property equivalent to that of the prepreg with the conventional thermosetting resin as a matrix, but also gives excellent toughness to the resulting molded product without injuring the thermal and mechanical properties. Particularly, it has a high resistance to interlaminar fracture when exposed to impact, so that it is preferably used as a structural material for airplanes, etc.

Prepregs, process for producing the same and laminates produced with the

A honeycomb core comprising honeycomb ribbons individually obtained by laminating a plurality of sheets of paper comprising short fibers oriented in a specific direction with an orientation degree of 50% or more, wherein the term 'orientation degree' means the proportion of the number of fibers oriented at an angle in the range of .+-.5.degree. with the specific direction to the total number of fibers which is expressed in percentage. The honeycomb core of the present invention is lighter in weight than conventional honeycomb cores and has a high strength properties in a specific direction.

Honeycomb core

A novel unidirectionally paralleled fiber reinforced thermosetting resin prepreg excellent in moldability which has plural grooves arranged continuously in longitudinal direction on at least one side surface thereof.

Prepreg and process for producing the same

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Nagoya, Japan

Toshihiro Hattori