Idemitsu Kosan Company, Limited

Other

Shigeru Murakami

Shigeru Matsuo

Tatsuya Tomioka

Shinji Chino

Hiroyuki Higuchi

Mikiya Hayashi

Katsutoshi Ohta

Kenkichi Takahashi

Naoto Yako

Ryouichi Nakano

Tetsuro Takeya

The pipe of the present invention comprises an ethylene base polymer comprising ethylene and an &agr;-olefin having 3 to 20 carbon atoms, wherein (A) a maximum value of the residual stress is 0.13 MPa or less; (B) the crystallinity is 0.630 to 0.850; (C) a gradient of the crystallinity against a thickness of the pipe is 0.465 or less; and (D) the pipe has a thickness of 5 to 50 mm. It is excellent in a durability, a rigidity and an impact resistance and suited to uses for large diameter pipes receiving a high internal pressure.

Pipe comprising ethylene base polymer

A polyether copolymer comprising the repeating units represented by the following general formula (I) ##STR1## and the repeating units represented by the following formula (II) ##STR2## the molar ratio of (I)/{(I)+(II)} being from 0.1 to 0.8 and the polyether copolymer having a melt viscosity of at least 500 poise as measured at 400.degree. C. is produced by allowing a dihalogenobenzonitrile, 1,4-bis(4'-halobenzoyl)benzene, and 4,4'-biphenol to react with each other in an aprotic polar solvent in the presence of an alkali metal compound. The polyether copolymer exhibits excellent heat-resistance, solvent resistance, and mechanical strength, and is suitable as a material for resin compositions, heat-resistant laminates, fiber, and film.

Polyether copolymers, resin compositions containing them, and molded

A polyetheric copolymer, a polyetheric block copolymer, and compositions of these copolymers containing:

Polyetheric copolymers, process for preparing the same compositions

Disclosed is a polyester carbonate containing imido groups comprising recurring units represented by the following formula: ##STR1## and recurring units represented by the following formula:

Polyester carbonate containing imido groups and method of preparing the

Polyester polymers consisting essentially of repeating units having the formula ##STR1## repeating units having the formula

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Chiba, Japan

Shigeru Murakami