US4142031A
Expired / Lapsed
US
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Polycaprolactam composition having improved melt spinnability and method for improving melt spinnability of polycaprolactam
Assignee: Toray Industries Inc
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Filing: 1977-10-27
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Granted: 1979-02-27
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Expires: 1997-10-27
Abstract
Abstract When magnesium oxide in which the half-width of the X-ray diffraction profile at (200) as determined according to a specific method is at least 0.3 is incorporated in an amount of 0.05 to 2.0% by weight in polycaprolactam, a polycaprolactam composition having an improved spinnability is obtained.
Inventors
- 👤 Tetsuya Kato
- 👤 Akira Ishitani
- 👤 Kiyotomi Kobori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:54
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/88; D01F6/90; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
50 words
A polycaprolactam fiber consisting essentially of a polycaprolactam composition comprising polycaprolactam and, incorporated therein, 0.05 to 2.0% by weight of magnesium oxide in which the half-width of the X-ray diffraction profile at (200) as determined according to the method described in the text of the specification is at least 0.3.
Claim 2
Dependent Claim
50 words
A polycaprolactam fiber consisting essentially of a polycaprolactam composition comprising polycaprolactam and, incorporated therein, 0.05 to 2.0% by weight of magnesium oxide in which the half-width of the X-ray diffraction profile at (200) as determined according to the method described in the text of the specification is at least 0.3.
Claim 3
Dependent Claim
70 words
A polycaprolactam composition having an improved melt spinnability comprising polycaprolactam and, incorporated therein, 0.05 to 2.0% by weight of powdered magnesium oxide having a particle size smaller than 1/2 the diameter of the filament into which the composition is to be spun, in which the half-width of the X-ray diffraction profile at (200) as determined according to the method described in the text of the specification is at least 0.3.
Claim 4
Dependent Claim
70 words
A polycaprolactam composition having an improved melt spinnability comprising polycaprolactam and, incorporated therein, 0.05 to 2.0% by weight of powdered magnesium oxide having a particle size smaller than 1/2 the diameter of the filament into which the composition is to be spun, in which the half-width of the X-ray diffraction profile at (200) as determined according to the method described in the text of the specification is at least 0.3.
Claim 5
Dependent Claim
18 words
A polycaprolactam composition as set forth in claim 1 wherein said half-width at (200) is 0.4 to 0.9.
Claim 6
Dependent Claim
22 words
A polycaprolactam composition as set forth in claim 1 wherein the amount incorporated of magnesium oxide is 0.08 to 0.2% by weight.
Claim 7
Dependent Claim
18 words
A polycaprolactam composition as set forth in claim 1 wherein the polycaprolactam is substantially a homopolymer of ε-caprolactam.
Claim 8
Dependent Claim
33 words
A polycaprolactam composition as set forth in claim 1 wherein the relative viscosity of the polycaprolactam is 2.0 to 2.8 as measured at 25° C. in 98 Wt.% H 2 SO 4 .
Claim 9
Dependent Claim
29 words
A polycaprolactam composition as set forth in claim 1 wherein the terminal amino group concentration of the polycaprolactam is at least 5 × 10 -5 mole/g of the polymer.
Claim 10
Dependent Claim
59 words
An improved process for melt spinning of polycaprolactam which comprises melt-spinning from a spinneret a polycaprolactam composition comprising polycaprolactam and, in corporated therein, 0.05 to 2.0% by weight of magnesium oxide in which the half-width of the X-ray diffraction profile at (200) as determined according to the method described in the text of the specification is at least 0.3.
Claim 11
Dependent Claim
59 words
An improved process for melt spinning of polycaprolactam which comprises melt-spinning from a spinneret a polycaprolactam composition comprising polycaprolactam and, in corporated therein, 0.05 to 2.0% by weight of magnesium oxide in which the half-width of the X-ray diffraction profile at (200) as determined according to the method described in the text of the specification is at least 0.3.
Claim 12
Dependent Claim
23 words
A melt spinning process according to claim 8 wherein the melt spinning is carried out at a temperature not higher than 280° C.
Claim 13
Dependent Claim
18 words
A melt spinning process according to claim 8 wherein powdery magnesium oxide is incorporated into pellets of polycaprolactam.
Claim 14
Dependent Claim
28 words
A melt spinning process according to claim 8 wherein the terminal amino group concentration of the polycaprolactam is at least 5 × 10 -5 mole/g of the polymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |