Nippon Ester Co., Ltd.

Keizo Tsujimoto

Tetsuo Matsumoto

Takayuki Imamura

Atsuko Ueda

Eiji Ichihashi

Takashi Katagiri

Kouzi Shinogi

Katsuto Matsuzawa

Hitoshi Otsubo

Akiko Kuroyanagi

Shunichiro Hamada

Satomi Nagai

A flame resistant polyester produced by addition and copolymerization of a phosphorus compound represented by general formula (I) below as a diol component of the polyester in an amount of 500 ppm or more in terms of phosphorus atom content in the polyester, which polyester has alkylene terephthalate units as main repeating units and which has an intrinsic viscosity of not less than 0.5 measured at 20.degree. C. in a mixture of equal weight of phenol and tetrachloroethane: ##STR1## where E is --CH.sub.2 CH.sub.2 --, Ar is an aromatic group or an aromatic group substituted by a lower alkyl group or a halogen atom, and m and n denote, respectively, integers the sum of which is from 1 to 20.

Flame resistant polyester from di aryl-di(hydroxyalkylene oxy)aryl

A polyester, wherein pendent phosphorus atoms are bound to the main chain of the polyester, having an excellent flame resistance and a high intrinsic viscosity can be stably produced without deteriorating the properties of said polyester by preliminarily copolymerizing a polyester with a specific unsaturated compound and then reacting the unsaturated bond thus-formed with a specific phosphorus compound having a P-H bond.

Process for producing flame resistant polyester

The present invention relates to a denier-mixed composite yarn containing 20 weight percent or more coarse filaments whose single filament fineness is 3 deniers or more and 5 weight percent or more fine filaments whose single filament fineness is 1.5 denier or less. Part or all of the coarse filaments are of non-circular cross-section, the stress of the composite yarn at 10% elongation is 2.5 g/d or less, and the composite yarn has a particular distribution of elongation. According to such denier-mixed composite yarn, superior dry feel fullness and softness can be imparted to woven and knit fabrics.

Denier-mixed composite yarn, denier-mixed special thick and thin yarn,

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Aichi, Japan

Keizo Tsujimoto