US3900678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite filaments and process for the production thereof
Assignee: Asahi Kasei Corp
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Filing: 1970-07-20
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Granted: 1975-08-19
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Expires: 1990-07-20
Abstract
Abstract Composite filaments comprised of two components disposed in side-by-side or eccentric sheath-core relationship. A first component is a crystalline polypropylene homopolymer. The second component is a random or block copolymer of propylene and another olefin. The composite filaments have a crimp-developing force of more than 15%.
Inventors
- 👤 Itsuho Aishima
- 👤 Noboru Fukuma
- 👤 Hisaya Sakura
- 👤 Hiroshi Chayamiti
- 👤 Toshio Okamoto
- 👤 Yuzuru Doi
- 👤 Hiroshi Henmi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:39
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/06; Y; Y10; Y10S; Y10S264/00; Y10S264/26; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A COMPOSITE FILAMENT COMPRISED OF TWO COMPONENTS DISPOSED IN SIDE-BY-SIDE RELATIONSHIP OR ECCENTRIC SHEATH-CORE RELATIONSHIP, A FIRST COMPONENT BEING CRYSTALLINE POLYPROPYLENE HOMOPOLYMER AND A SECOND COMPONENT BEING SELECTED FROM THE GROUP CONSISTING OF A RANDOM COPOLYMER OF PROPYLENE AND 0.5 TO 20 MOLE % OF ANOTHER OLEFIN AND A BLOCK COPOLYMER OF PROPYLENE AND 1.0 TO 40 MOLE % OF ANOTHER OLEFIN, SAID OTHER OLEFIN OF THE COPOLYMER BEING SELECTED FROM THE GROUP CONSISTING OF ETHYLENE, BUTENE-1, HEXENE-1, OCTENE1, 4-METHYLPENTENE-1, 3-METHYLBUTENE-1 AND STYRENE, SAID COMPOSITE FILAMENT HAVING A CRIMP-DEVELOPING FORCE OF MORE THAN 15%.
Claim 2
Dependent Claim
94 words
A COMPOSITE FILAMENT COMPRISED OF TWO COMPONENTS DISPOSED IN SIDE-BY-SIDE RELATIONSHIP OR ECCENTRIC SHEATH-CORE RELATIONSHIP, A FIRST COMPONENT BEING CRYSTALLINE POLYPROPYLENE HOMOPOLYMER AND A SECOND COMPONENT BEING SELECTED FROM THE GROUP CONSISTING OF A RANDOM COPOLYMER OF PROPYLENE AND 0.5 TO 20 MOLE % OF ANOTHER OLEFIN AND A BLOCK COPOLYMER OF PROPYLENE AND 1.0 TO 40 MOLE % OF ANOTHER OLEFIN, SAID OTHER OLEFIN OF THE COPOLYMER BEING SELECTED FROM THE GROUP CONSISTING OF ETHYLENE, BUTENE-1, HEXENE-1, OCTENE1, 4-METHYLPENTENE-1, 3-METHYLBUTENE-1 AND STYRENE, SAID COMPOSITE FILAMENT HAVING A CRIMP-DEVELOPING FORCE OF MORE THAN 15%.
Claim 3
Dependent Claim
23 words
The composite filament of claim 1 in which the second component is a random copolymer containing about 3 to 10 mole % ethylene.
Claim 4
Dependent Claim
18 words
The composite filament of claim 1 wherein the crimp-developing force of the filament is 30 to 40 %.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |