US3758658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ecular weight linear polymers process for the production of technical endless filaments of high mol
Assignee: Vickers Zimmer AG
•
Filing: 1970-07-24
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Granted: 1973-09-11
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Expires: 1990-07-24
Abstract
Abstract Process for production of endless filaments from high molecular weight polymers having improved properties of low Eta intr. loss, and few capillary breaks per 10 Km, in a melt spinning process wherein the polymer melt is supplied to a spinning beam at high pressure, the melt is thereafter passed through a flow path constriction which effects a pressure drop of from 150 to 1200 atmospheres and a melt enthalpy increase sufficient to internally heat each of the melt particles uniformly and independently of their position in the melt flow cross section, and thereafter maintaining the increased temperature of the melt by heating all the surfaces thereafter contacted by the melt.
Inventors
- 👤 K Riggert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:52
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/06; D01D1/09
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
12 words
A process as in claim 1 wherein said polymer is a polyester.
Claim 2
Dependent Claim
59 words
A process as in claim 2 wherein: a. said polyester is polyethylene terephthalate, b. said pressure drop is effected at the earliest after 50 percent of the total melt residence time between generation and spinning, and c. the temperature, T2, of all of said surfaces touched by said melt after said pressure drop is maintained within the following limits:
Claim 3
Dependent Claim
34 words
A process as in Claim 3 wherein said polyethylene terephthalate melt is supplied at a temperature, T1, between 285 and 310* C., and the pressure drop, Delta p, is between 200 and 800 atmospheres.
Claim 4
Dependent Claim
32 words
A process as in claim 1 wherein said polymer is supplied at a temperature, T1, between 285 and 310* C., and the pressure drop, Delta p, is between 200 and 800 atmospheres.
Claim 5
Dependent Claim
38 words
A process as in claim 1 wherein: a. said assembly comprises a spinning pump and a spinning nozzle plate, and b. said pressure drop is effected in the flow path between said spinning pump and spinning nozzle plate.
Claim 6
Dependent Claim
30 words
A process as in claim 6 wherein said assembly includes a spinning filter disposed upstream of said nozzle plate, and said pressure drop is effected principally at said spinning filter.
Claim 7
Dependent Claim
59 words
A process as in claim 7 wherein: a. said polymer is polyethylene terephthalate, b. said pressure drop is effected at the earliest after 50 percent of the total melt residence time between generation and spinning, and c. the temperature, T2, of all of said surfaces touched by said melt after said pressure drop is maintained within the following limits:
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |