US3895091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of fibers from phenylene sulfide polymers
Assignee: Phillips Petroleum Co
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Filing: 1974-04-08
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Granted: 1975-07-15
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Expires: 1994-04-08
Abstract
Abstract Strong, high modulus, high-melting, non-burning fibers are formed from aromatic sulfide polymers, such as phenylene sulfide polymers, by melt spinning an aromatic sulfide polymer having a melt flow in the range of from 75 to 800 followed by drawing the fibers in the molten state, cooling the fibers, and, optionally, drawing the cooled fibers in the solid state.
Inventors
- 👤 James N Short
- 👤 Lee O Edmonds
- 👤 Executrix By Emmilou Edmonds
- 👤 Jr James T Edmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/76; D01F6/765
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
A PROCESS FOR THE PRODUCTION OF STRONG, HIGH-MODULUS, HIGH-MELTING, NON-BURNING POLY(PHENYLENE SULFIDE) FIBERS HAVING EXCELLENT CORROSION-RESISTANT PROPERTIES WHICH COMPRISES THE STEPS OF: A. HEATING A PHENYLENE SULFIDE POLYMER AT AN ELEVATED TEMPERATURE AND FOR A PERIOD OF TIME SUFFICIENT TO AT LEAST PARTIALLY CURE AND LOWER THE MELT FLOW OF THE POLYMER TO WITHIN THE RANGE OF 75 TO 800 GRAMS PR 10 MINUTES AS MEASURED BY ASTM METHOD D-1238-70 MODIFIED TO OPERATE AT 650*F WITH A PISTON LOAD OF 5 KILOGRAMS, B. MELT SPINNING THE PARTIALLY CURED POLYMER OBTAINED IN STEP (A) BY PASSING THE POLYMER IN THE MILTEN STATE THROUGH SPINNERET ORIFICES AT A TEMPERATURE ABBOVE THE POLYMER MELTING POINT TO PRODUCE FILAMENTS THEREFROM, AND C. DRAWING THE MOLTEN FILAMENTS OF TEP (B) BY TAKING THEM UP ON ROLLS AT A LINEAR VELOCITY AT LEAST 10 TIMES THE LINEAR VELOCITY OF THE POLYMER PASSING THROUGH THE SPINNERET ORIFICES TO FORM SAID STRONG, HIGH-MODULUS FIBERS.
Claim 2
Dependent Claim
156 words
A PROCESS FOR THE PRODUCTION OF STRONG, HIGH-MODULUS, HIGH-MELTING, NON-BURNING POLY(PHENYLENE SULFIDE) FIBERS HAVING EXCELLENT CORROSION-RESISTANT PROPERTIES WHICH COMPRISES THE STEPS OF: A. HEATING A PHENYLENE SULFIDE POLYMER AT AN ELEVATED TEMPERATURE AND FOR A PERIOD OF TIME SUFFICIENT TO AT LEAST PARTIALLY CURE AND LOWER THE MELT FLOW OF THE POLYMER TO WITHIN THE RANGE OF 75 TO 800 GRAMS PR 10 MINUTES AS MEASURED BY ASTM METHOD D-1238-70 MODIFIED TO OPERATE AT 650*F WITH A PISTON LOAD OF 5 KILOGRAMS, B. MELT SPINNING THE PARTIALLY CURED POLYMER OBTAINED IN STEP (A) BY PASSING THE POLYMER IN THE MILTEN STATE THROUGH SPINNERET ORIFICES AT A TEMPERATURE ABBOVE THE POLYMER MELTING POINT TO PRODUCE FILAMENTS THEREFROM, AND C. DRAWING THE MOLTEN FILAMENTS OF TEP (B) BY TAKING THEM UP ON ROLLS AT A LINEAR VELOCITY AT LEAST 10 TIMES THE LINEAR VELOCITY OF THE POLYMER PASSING THROUGH THE SPINNERET ORIFICES TO FORM SAID STRONG, HIGH-MODULUS FIBERS.
Claim 3
Dependent Claim
47 words
A process according to claim 1 wherein the melt-drawn fibers of step (c) are again drawn in the solid state about three to about eight times to produce poly(phenylene sulfide) fibers with a high degree of molecular orientation that are strong and have excellent high temperature properties.
Claim 4
Dependent Claim
25 words
A process according to claim 1 wherein the phenylene sulfide polymer is cured in step (a) by heating in the presence of an oxygen-containing gas.
Claim 5
Dependent Claim
35 words
A process according to claim 3 wherein the oxygencontaining gas is air and the temperature maintained during said oxidative heating is within the range 25*-125* F below the melting point of the phenylene sulfide polymer.
Claim 6
Dependent Claim
92 words
A process according to claim 3 wherein the phenylene sulfide polymer is precured to a melt flow in the range 100-500 by contacting with air and the inherent viscosity of the polymer prior to precuring is in the range 0.18 to 0.20, and the precured polymer is melt spun at a temperature of about 600* F, followed by melt drawing at least ten times and then drawing in the solid state in the range of 4 to 8 times to produce a strong, high-modulus poly(phenylene sulfide) fiber having excellent high temperature properties.
Claim 7
Dependent Claim
55 words
A process according to claim 1 wherein the phenylene sulfide polymer is cured in step (a) by heating in the presence of air at a temperature within the range of 25-125* F below the melting point of the polymer, and said polymer melt is passed through spinneret orifices of 5 mils to 40 mils diameter.
Claim 8
Dependent Claim
25 words
A process according to claim 1 wherein the phenylene sulfide polymer prior to heating has an inherent viscosity in the range of 0.15 to 0.25.
References Cited (Backward Citations)
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Cited
US3524835A
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US3519606A
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US3365431A
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US3539676A
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US3562199A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |