Process for preparing poly(tetramethylene terephthalate)yarn
Abstract
Abstract THERE IS PROVIDED A PROCESS FOR PREPARING YARN COMPRISED OF AT LEAST 85 PERCENT (BY WEIGHT) OF POLY(TETRAMETHYLENE) TEREPHTHALATE WITH A TOTAL SPUN DIENER OF FROM ABOUT 80 TO ABOUT 700 FROM POLYMER WITH A RELATIVE VISCOSITY OF FROM ABOUT 10 TO ABOUT 50 IN SAID PROCESS FROM ABOUT 5 TO ABOUT 70 FILAMENTS OF SAID POLYMER ARE EXTRUDED THROUGH A SPINNERETTE AT A SPINNING TEMPERATURE OF FROM ABOUT 240 TO ABOUT 280 DEGREES CENTIGRADE, AND THE EXTRUDED FILAMENTS ARE TAKEN UP AT A WINDUP SPEED OF FROM ABOUT 1000 TO ABOUT 10,000 FEET PER MINUTE; DURING SAID EXTRUSION, THE SPINNING THREADLINE TENSION PER EXTRUDED FILAMENT (AS MEASURED ABOUT 70 INCHES FROM THE FACE OF THE SPINNERETTE) IS AT LEAST 0.09 GRAMS PER FILAMENT. THEREAFTER THE EXTRUDED FILAMENTS ARE DRAWN IN ONE OR MORE STAGES TO A DRAW RATIO OF FROM ABOUT 1.0 TO ABOUT 5.0 AND, DURING THE DRAWING STEP, THE FILAMENTS ARE PASSED OVER A HEATED FEED ROLL AT A TEMPERATURE OF FROM ABOUT 60 TO ABOUT 180 DEGREES CENTIGRADE.
Inventors
- 👤 J Patterson
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |