US3895090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for direct spinning of polyethylene-1,2-diphenoxyethane-p,p{40 -dicarboxylate fibers
Assignee: Asahi Kasei Corp
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Filing: 1969-03-26
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Granted: 1975-07-15
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Expires: 1989-03-26
Abstract
Abstract Commercially useful polyethylene-1,2-diphenoxyethane-p,p''dicarboxylate fibers are obtained by the direct spinning of a melt of polyethylene-1,2-diphenoxyethane-p,p''-dicarboxylate with a commercially feasible take-up speed of 1800-3500 m/min by maintaining an intrinsic viscosity and a residual carboxyl group of said polymer within the range of 0.4-1.3 and less than 20 equivalents/106 g., respectively, and when the monofilament denier is as thin as 1.5 - 0.3, the take-up speed can be reduced to a value of 1000-1800 m/min.
Inventors
- 👤 Hidehiko Kobayashi
- 👤 Masatsugu Yoshino
- 👤 Kazuya Neki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:11
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/664; D; D01; D01F; D01F6/00; D01F6/58; D01F6/62
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
A PROCESS FOR THE DIRECT SPINNING OF COMMERCIAL USEFUL POLYETHYLENE-1,2-DIPHENOXETHANE-P,P''-DICARBOXYLATE FOBER WITHOUT ANY SUBSEQUENT STRETCHING OPERATION WHICH COMPRISES EXTRUDING A MELT OF A POLYMER CONTAINING SUBSTANTIALLY 100 MOL % OF REPETITION UNITS OF THE FORMULA:
Claim 2
Dependent Claim
35 words
A PROCESS FOR THE DIRECT SPINNING OF COMMERCIAL USEFUL POLYETHYLENE-1,2-DIPHENOXETHANE-P,P''-DICARBOXYLATE FOBER WITHOUT ANY SUBSEQUENT STRETCHING OPERATION WHICH COMPRISES EXTRUDING A MELT OF A POLYMER CONTAINING SUBSTANTIALLY 100 MOL % OF REPETITION UNITS OF THE FORMULA:
Claim 3
Dependent Claim
41 words
A process according to claim 1 wherein the melt of polyethylene-1,2-diphenoxyethane-p,p''-dicarboxylate is extruded through a spinneret having hole diameters within the range of 0.25 mm to 0.9 mm and a hole length within the range of 1.5 mm to 10 mm.
Claim 4
Dependent Claim
32 words
A process according to claim 1 wherein the extruded polyethylene-1,2-diphenoxyethane-p,p''-dicarboxylate is taken up after travelling through a zone maintained at 10*-180*C and which extends from the spinneret for at least 30 cm.
Claim 5
Dependent Claim
46 words
A process according to claim 1 wherein the fibers so produced have a yield strength of at least 1.0 g/d., an initial modulus of elasticity of at least 70 g/d., a breaking strength of at least 3.0 g/d., and a residual elongation of less than 80%.
Claim 6
Dependent Claim
68 words
The process according to claim 1 wherein said polymer is produced by subjecting 1,2-bis-(paracarbomethoxy)-phenoxyethane or its ester forming derivatives and ethylene glycol to ester-exchange reaction in the presence of a catalyst to form bisglycol of 1,2-bis-(paracarbomethoxy)-phenoxyethane and then subjecting the latter to condensation polymerization in the presence of a polymerization catalyst at an elevated temperature and under a reduced pressure while eliminating excessive glycol produced in the condensation.
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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 |