(19)
(11) EP 0 207 489 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.01.1988 Bulletin 1988/02

(43) Date of publication A2:
07.01.1987 Bulletin 1987/02

(21) Application number: 86108904

(22) Date of filing: 01.07.1986
(84) Designated Contracting States:
DE FR GB

(30) Priority: 02.07.1985 JP 14399085

(71) Applicant: TEIJIN LIMITED
 ()

(72) Inventors:
  • Shimazu, Takumi
     ()
  • Nagai, Hiroyuki
     ()
  • Fujita, Masakazu
     ()
  • Matsui, Masahiro
     ()

   


(54) Highly-shrinkable polyester fiber, process for preparation thereof, blended polyester yarn and process for preparation thereof


(57) A highly-shrinkable polyester fiber composed of a polyester comprising ethylene terephthalate units as main recurring units and having a birefringence (An) of from 0.130 to 0.165, wherein the boiling water shrinkage is at least 30% and the peak temperature and peak value of the thermal stress are 90 to 105°C and at least 0.4 g/de, respectively. The fiber has excellent shrinkability as well as high heat resistance, dimensional stability and alkali resistance and provides a blended polyester yarn excellent in bulkiness and hand.






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