US3608044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for melt spinning polyoxymethylene filaments having elastic recovery
Assignee: Celanese Corp
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Filing: 1969-01-28
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Granted: 1971-09-21
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Expires: 1989-01-28
Abstract
Abstract A process for producing filamentary material of an oxymethylene polymer having an elastic recovery at 70* F. of at least about 70 percent when subjected to a strain of up to 50 percent.
Inventors
- 👤 Myron J Coplan
- 👤 Howard I Freeman
- 👤 Joseph S Panto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:51
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/66
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
The process of claim 1 comprising subjecting the random oxymethylene copolymer filamentary material to a quench temperature up to about 285* F., a first after-stretching operation at a draw ratio of from about 1.3 to 1.5 and a second after-stretching operation at a draw ratio of from about 1.3 to 1.5.
Claim 2
Dependent Claim
76 words
The process of claim 1 comprising initially taking up the random oxymethylene copolymer filamentary material at a drawdown ratio of from about 25 to 350, continuously advancing said material at a point beyond the point of initial takeup at a rate greater than that of said takeup such that said fully solidified material is drawn at a temperature of from about 50* F. to 250* F. and a draw ratio of from about 1.2 to 2.3
Claim 3
Dependent Claim
183 words
The process of claim 1 comprising taking up the filamentary material just subsequent to extrusion at an overall drawdown ratio of from about 25 to 350, subjecting said material to frictional contact with a solid surface at a point intermediate the points of extrusion and takeup such that the tension exerted on said material at the takeup point is not translated back to the point of extrusion, subjecting said taken-up material to an after-stretching operation at a temperature of from about 50* F. to 250* F. and a draw ratio of from about 1.2:1 to 2.3:1, enhancing the elastic recovery and tenacity and rendering said filamentary material uniformly opaque by subjecting said filamentary material to a second after-stretching operation which comprises contacting said filamentary material with hot H20 at a temperature of from about 190* F. to 250* F. for at least 1 minUte at a draw ratio of from about 1.2:1 to 2.3:1 and forming said filamentary material, which has an elastic recovery at 70* F. of at least about 75 percent from an extension of 50 percent, into a yarn package.
References 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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |