Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1991-07-29
1992-07-21
Lorin, Hubert C.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
26421115, 26421117, D01F 662
Patent
active
051320673
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: 4003974 (1977-01-01), Chantry et al.
patent: 4491657 (1985-01-01), Saito et al.
patent: 4529368 (1985-07-01), Makansi
Bheda Jayendra H.
Nelson Charles J.
Rim Peter B.
Turner James M.
Allied-Signal Inc.
Lorin Hubert C.
Thrower William H.
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