US4806299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing delustered nylon fiber containing segmented striations of polypropylene
Assignee: Invista North America LLC
•
Filing: 1987-05-05
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Granted: 1989-02-21
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Expires: 2007-05-05
Abstract
Abstract Small amounts of selected low molecular weight polypropylene effectively delusters drawn nylon filaments when drawn at a temperature not exceeding the softening point of the polypropylene.
Inventors
- 👤 John T. Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:59
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/88; D01F6/90; D01F1/00; D01F1/02; D01F1/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A process for producing delustered nylon filaments containing polypropylene, said polypropylene being present in generally cylindrical segmented striations having an L'/D ratio of from 1 to 10 and running generally parallel to the filament axis, comprising the steps of combining a melt of nylon with from about 0.1 to 5% by weight of a melt of polypropylene having a melting point above 120° C., a softening point below said melting point, a molecular weight of 2000-40,000, and a viscosity of 200-10,000 cP at 190° C. to form a blend, melt-spinning the blend to form filaments, quenching the filaments, and drawing the filaments at a temperature not exceeding said softening point.
Claim 2
Dependent Claim
110 words
A process for producing delustered nylon filaments containing polypropylene, said polypropylene being present in generally cylindrical segmented striations having an L'/D ratio of from 1 to 10 and running generally parallel to the filament axis, comprising the steps of combining a melt of nylon with from about 0.1 to 5% by weight of a melt of polypropylene having a melting point above 120° C., a softening point below said melting point, a molecular weight of 2000-40,000, and a viscosity of 200-10,000 cP at 190° C. to form a blend, melt-spinning the blend to form filaments, quenching the filaments, and drawing the filaments at a temperature not exceeding said softening point.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the nylon used is polyhexamethylene adipamide.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the nylon contains from about 0.10 to 0.35% of TiO 2 .
Claim 5
Dependent Claim
22 words
The process of claim 2 wherein the polypropylene has a molecular weight of 2000-12,000 and a viscosity of 200-2000 at 190° C.
Claim 6
Dependent Claim
36 words
The process of claim 2 wherein the polypropylene has a molecular weight of about 4500, a melting point of about 158° C., a viscosity of about 575 cP and a softening point of about 146° C.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |