Kureha Kagaku Kogyo Kabushiki Kaisha

Kureha Kagaku Kogyo K.k.

Kureha Chemical Industry Company, Limited

Tomoo Susa

Tohru Sasaki

Hiroyuki Endo

Syuuzi Terasaki

Seiichi Ohira

Toshiya Mizuno

Masamichi Akatsu

Hiromitsu Makita

Takeo Higashi

A laminated sheet suitable for high-frequency welding comprises a vinylidene fluoride resin layer (A), a bonding layer (B) consisting of a blend of vinylidene fluoride resin and a copolymer resin consisting of methyl methacrylate and alkyl ester of acrylate, whose alkyl group has 3-5 carbon atoms, a base-material layer (C) of vinyl chloride resin bonded to the bonding layer (B), and a base-cloth layer (D) bonded to the base-material layer (C). A bonded laminated sheet obtained by bonding two laminated sheets with high-frequency welding and the application of the bonded laminated sheet to tents are also disclosed.

Laminated sheet and a bonded laminated sheet

Abrasive filaments made of a composition which comprises 95-70 vol.% of a polyvinylidene fluoride resin, whose inherent viscosity (.eta..sub.inh) ranges from 0.9 to 1.4, and 5-30 vol.% of abrasive grains. They are produced by melt-spinning the composition and then stretching the resultant filaments at a draw ratio of 2.5 times-5.5 times within a temperature range of 100-200.degree. C.

Abrasive filaments and production process thereof

Abrasive filaments made of a composition which comprises 95-70 vol. % of a polyvinylidene fluoride resin, whose inherent viscosity (.eta..sub.inh) ranges from 0.9 to 1.4, and 5-30 vol. % of abrasive grains. They are produced by melt-spinning the composition and then stretching the resultant filaments at a draw ratio of 2.5 times-5.5 times within a temperature range of 100.degree.-200.degree. C.

The dielectric film contains from 40 to 97% by volume of a thermoplastic resin, from 2 to 50% by volume of a ceramic dielectric and from 1 to 25% by volume of carbon black. The composite film contain a base film layer composed of said dielectric film and the dielectric film of the thermoplastic resin provided on at least one surface thereof.

Dielectric films and process for preparing same

A piezoelectric and pyroelectric film made from a resin composition of polymer of vinylidene fluoride, which is characterized by an index of birefringence of larger than 3.times.10.sup.-3 and a ratio of d.sub.31 /d.sub.32 of 0.3 to 3.0, and which may be prepared by further stretching a biaxially stretched film made from the above-mentioned resin composition at a temperature lower than the temperature of the biaxially stretching by more than 20.degree. C. before or at the same time of a treatment for orientation polarization of the film.

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Iwaki, Japan

Tomoo Susa