Toray Industries, Inc.

Matsushita Electric Works, Ltd.

Masaharu Yamamoto

Yoshihiko Nakamura

Masahiro Matsumura

Takuji Sato

Isoo Saito

Yasuo Fukuhara

Yukio Hatta

Koichi Kubota

Hiroshi Toshima

Takayuki Fukuda

Kiyohiro Nagao

Makizi Miyao

Shigekazu Takanohashi

Akihiro Atsumi

In a process for manufacturing a prepreg for use as an electrically insulating material, a main epoxy resin composition and a subsidiary resin composition containing a hardener which have been separately filtered and metered are quickly mixed into a mixture resin composition, a reinforcing member is coated with a uniformly thin film of the mixture resin composition by a die coater under specific temperature, average residence time and low shear conditions, the coated reinforcing member is heated in non-contact manner by an infrared ray heater to have the member impregnated with the resin composition of the film, the member is further heated in non-contact manner by a floating dryer to have the resin composition semi-hardened, and the member is unified through compaction rolls, whereby the prepreg in the form of a sheet-shaped fiber reinforced composite material is continuously manufactured.

Process for manufacturing prepregs for use as electric insulating

A conjugated fiber having a sheath-core conjugated structure comprising a polyester core component composed mainly of polyethylene terephthalate and a polyamide sheath component composed mainly of polyhexamethylene adipamide, is disclosed, which has excellent mechanical properties such as a high tenacity, a high modulus, and an improved dimensional stability, and an improved adhesion to a rubber, especially a high-temperature adhesion, an improved heat resistance in a rubber, and a high fatigue resistance, and thus is useful as an industrial material. By adopting a high-speed spinning procedure in the fiber preparing process, the peel resistance in the interface of the sheath-core conjugated structure is greatly improved, and the following valuable characteristics not possessed by conventional conjugated yarns can be obtained:

High-tenacity conjugated fiber and process for preparation thereof

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Nagoya, Japan

Masaharu Yamamoto