Dimensionally stable polyester yarn for highly dimensionally sta

Details Dimensionally stable polyester yarn for highly dimensionally sta Dimensionally stable polyester yarn for highly dimensionally sta

1988-10-28

1991-11-26

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

57902, 2642108, 26421112, 26421115, 428364, 428395, D02G 348, B60C 900

Patent

active

050675389

ABSTRACT:
Polyethylene terephthalate yarn is prepared by spinning under very high-stress conditions wherein oriented-crystalline undrawn yarns are obtained. Selection of process parameters yields a partially oriented semicrystalline undrawn yarn with a crystallinity of 16 to 24 percent and a melting point elevation of 14.degree. to 22.degree. C. which is drawn to produce the resulting unique combination of properties: (A) a terminal modulus of at least 20 g/d, (B) a dimensional stability defined by E.sub.4.5 +FS<11.5 percent, (C) a tenacity of at least 5 grams per denier, (D) a melting point elevation of 14.degree. to 22.degree. C., preferably 17.degree. to 20.degree. C., and (E) an amorphous orientation function of less than 0.75. The resulting treated tire cord unexpectedly provides high ultimate elongation and high toughness in combination with improved dimensional stability.

REFERENCES:
patent: 4101525 (1978-07-01), Davis et al.
patent: 4491657 (1985-01-01), Saito
patent: 4690866 (1987-09-01), Kumakowa et al.
patent: 4827999 (1989-05-01), Yabuki et al.
patent: 4975326 (1990-12-01), Buyalos et al.

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