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US5207959A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for obtaining pet yarns with an improved production efficiency

Assignee: Rhone Poulenc Fibres SA
•
Filing: 1990-12-13
•
Granted: 1993-05-04
•
Expires: 2010-12-13
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Abstract

Abstract Process for improving the production efficiency of the spinning of an undrawn, preoriented yarn based on polyethylene terephthalate (PET) by the introduction, before the spinning, of 0.03 to 0.1% by weight of fumed silica with a particle size of between 5 and 15 nm into the molten polymer in the form of dispersion in a masterbatch of the same polymer as that to be processed, then spinning the PET containing the silica in the finely dispersed state, the filaments being next cooled by means of a gas stream at temperature between 17 DEG to 22 DEG C. and then sized and wound at a velocity of between 3500 and 5000 m/min. The gain in production efficiency, evaluated in relation to the shrinkage of the filaments in dry air at 180 DEG C., is at least 7%, generally at least 10-15%.

Inventors

  • 👤 Paul Antikow
  • 👤 Francois Pinaud

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 07:22
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; D01F6/00; D01F6/58; D01F6/62; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2915; Y10T428/2927

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 120 words
Process for improving the production efficiency during the spinning of an undrawn, preoriented yarn based on polyethylene terephthalate (PET) at a velocity of at least 3000 m/min, characterized in that, before the spinning, 0.03 to 0.1% by weight of fumed silica with a particle size of between 5 and 15 nm is introduced into the molten polymer in the form of dispersion in a masterbatch of the same polymer as that to be processed, followed by spinning of the PET containing the silica in the finely dispersed state, the filaments being next cooled by means of a gas stream at temperature between 17° to 22° C. and then sized and wound at a velocity of between 3500 and 5000 m/min.
Claim 2
Dependent Claim 120 words
Process for improving the production efficiency during the spinning of an undrawn, preoriented yarn based on polyethylene terephthalate (PET) at a velocity of at least 3000 m/min, characterized in that, before the spinning, 0.03 to 0.1% by weight of fumed silica with a particle size of between 5 and 15 nm is introduced into the molten polymer in the form of dispersion in a masterbatch of the same polymer as that to be processed, followed by spinning of the PET containing the silica in the finely dispersed state, the filaments being next cooled by means of a gas stream at temperature between 17° to 22° C. and then sized and wound at a velocity of between 3500 and 5000 m/min.
Claim 3
Dependent Claim 22 words
Process according to claim 1, characterized in that the fumed silica is introduced in a proportion of 0.05 to 0.1% by weight.
Claim 4
Dependent Claim 31 words
Process according to claim 1, characterized in that the gain in production efficiency, evaluated in relation to the dry air shrinkage of the filaments at 180° C. is at least 7%.
Claim 5
Dependent Claim 18 words
Process according to claim 1, characterized in that the improvement in production efficiency is of at least 10%.
Claim 6
Dependent Claim 22 words
Process according to claim 1, characterized in that the spinning is carried out at a velocity of between 4000 and 5000 m/min.
Claim 7
Dependent Claim 15 words
Process according to claim 1, characterized in that the filaments are interlaced before being wound.

References Cited (Backward Citations)

US4547546A Cited
EP0140559A2 Cited
JPS60246813A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-05-03 1996-11-02 1997-05-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-05-03 2000-11-02 2001-05-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-05-03 2004-11-02 2005-05-04 $7700.00 Window Closed / Lapsed

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