Patent US4418176A successfully refreshed from Google Patents.
US4418176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-crimping acrylic fiber from a melt of two non-compatible polymers
Assignee: Wyeth Holdings LLC
•
Filing: 1981-06-02
•
Granted: 1983-11-29
•
Expires: 2001-06-02
Abstract
Abstract A self-crimping, melt-spun acrylonitrile polymer fiber comprising as the continuous fiber matrix a first polymer comprising from about 80 to about 99 weight percent acrylonitrile and from about 1 to about 20 weight percent of one or more monomers copolymerizable with acrylonitrile and heterogeneously dispersed within said fiber matrix a second polymer incompatible with said first polymer.
Inventors
- 👤 William E. Streetman
- 👤 Shashikumar H. Daftary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:46
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22; Y; Y10; Y10S; Y10S525/00; Y10S525/931
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A self-crimping, melt-spun acrylonitrile polymer fiber comprising as the continuous fiber matrix a first polymer comprising from about 80 to about 99 weight percent acrylonitrile and from about 1 to about 20 weight percent of one or more monomers copolymerizable with acrylonitrile and heterogeneously dispersed within said fiber matrix a second polymer selected from the group consisting of polyethylene and polypropylene incompatible with said first polymer and having thermal and/or hydrophilic properties which differ from those of said first polymer by an amount sufficient to provide self-crimping properties to said fiber, said first polymer constituting the major weight proportion of said fiber.
Claim 2
Dependent Claim
102 words
A self-crimping, melt-spun acrylonitrile polymer fiber comprising as the continuous fiber matrix a first polymer comprising from about 80 to about 99 weight percent acrylonitrile and from about 1 to about 20 weight percent of one or more monomers copolymerizable with acrylonitrile and heterogeneously dispersed within said fiber matrix a second polymer selected from the group consisting of polyethylene and polypropylene incompatible with said first polymer and having thermal and/or hydrophilic properties which differ from those of said first polymer by an amount sufficient to provide self-crimping properties to said fiber, said first polymer constituting the major weight proportion of said fiber.
Claim 3
Dependent Claim
23 words
The fiber of claim 1 wherein said first polymer is a graft of acrylonitrile, methyl methacrylate and acrylamidomethylpropane sulfonic acid on polyvinyl alcohol.
Claim 4
Dependent Claim
11 words
The fiber of claim 1 wherein said second polymer is polypropylene.
Claim 5
Dependent Claim
11 words
The fiber of claim 2 wherein said second polymer is polypropylene.
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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |