Industrial Technology Research Institute

Dairen Chemical Corporation

Mei-Sui Chen

Wu-Bin Yuo

June-Yen Chou

Shien Chang Chen

Shen-Nan Tong

Fu Shen Lin

Hsing Yun Wang

Hung Shu Sun

Mao Song Lee

Nien-Hsi Chang

Yann Jyh Huang

This invention relates to a process for producing polyester fibers with enhanced dyeability, lesser elongation and greater strength, which comprises combining 2-methyl-1,3-propanediol into a mixture containing terephthalic acid, or an alkyl ester thereof, and a (C.sub.2-6)alkanediol, and carrying out polymerization. The resultant polyester copolymer is then spun to produce polyester fibers. This invention also relates to the polyester fibers produced by this process. These polyester fibers exhibit enhanced dyeability, lesser elongation and greater strength than un-improved polyester fibers.

Process for producing polyester fiber having improved dyeability,

Poly(butylene terephthalate) is prepared in a two-stage process wherein terephthalic acid and 1,4-butanediol are esterified in the presence of a catalytic amount of a catalyst having an organo-metallic component which is an organo-titanate compound, an organo-tin compound or a combination thereof and a salt component which is an organic acid salt or an inorganic salt. In a second step, the esterification product is subject to polycondensation. By following the foregoing procedure, the formation of tetrahydrofuran is significantly suppressed and the percent conversion of esterification products increased.

Preparation of polyesters from terephthalic acid

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Hsinchu, Taiwan

Mei-Sui Chen