Toyo Boseki Kabushiki Kaisha

Susumu Tate

Akira Chiba

Kazuo Kurita

Youichi Watanabe

Toshihiko Ohta

Hideaki Ishihara

Fujio Okada

Haruhiko Narusawa

Hiroshi Hashimoto

Masahiro Hayashi

Wataru Yoshikawa

Process for producing polyester fibers of high tenacity and high modulus, by melt-spinning a polyester having an intrinsic viscosity of not lower than 0.3, to obtain extruded filaments of low orientation having a birefringence not higher than 10.0.times.10.sup.-3, post-polymerizing the filaments in a heating medium, and subjecting the filaments to multi-stage drawing in at least two stages.

Process for producing polyester fibers

Polyester fibers having both a high strength and a high modulus prepared from ethylene terephthalate polyester, and having an intrinsic viscosity of not less than 1.0 and an initial tensile modulus is not less than 130 g/d, said intrinsic viscosity being determined in a mixed solvent of p-chlorophenol and tetrachloro ethane (3:1) at 30.degree. C. Processes for producing the fibers are also disclosed.

Polyester fibers having high strength and high modulus and process for

A novel ultra-high-molecular-weight polyester prepared from aromatic dicarboxylic acid or alkyl ester thereof and alkylene glycol, and having intrinsic viscosity of not less than 1.5 and insoluble polymer content of not more than 10% by weight.

Ultra-high-molecular-weight polyesters

A process for production of polyester which comprises steps of:

Process for production of polyester

Growing community of inventors

Shiga, Japan

Susumu Tate