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US4840846A
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US
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Heat-adhesive composite fibers and method for making the same
Assignee: JNC Corp
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Filing: 1987-09-10
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Granted: 1989-06-20
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Expires: 2007-09-10
Abstract
Abstract A heat-adhesive composite fiber consisting of core portion and sheath portion, the core portion being of the side-by-side type composite structure comprising two core components of different polypropylene base polymers at a composite ratio of 1:2 to 2:1, one of the core components having a Q value, expressed in terms of the weight-average molecular weight/the number-average molecular weight, equal to or higher than 6 and the other having a Q value equal to or lower than 5, and the sheath portion meeting at least the requirements that it should comprise a sheath component of a polyethylene base polymer having a melting point lower by at least 20° C. than the lower one of the melting points of the two core components, and it should cover the core portion in a proportion of 25 to 55% by weight based on the total weight of it and the core portion.
Inventors
- 👤 Shozo Ejima
- 👤 Taizo Sugihara
- 👤 Morio Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:47
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2925; Y10T428/2929; Y10T428/2931; Y10T428/2973; Y10T428/2976
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
A heat-adhesive composite fiber comprising a core portion and a sheath portion, (A) said core portion being of the side-by-side type composite structure comprising two core components made of different polypropylene base polymers present in a composite ratio of 1:2 to 2:1, one of said core components having a Q value, expressed in terms of weight-average molecular weight/number-average molecular weight, equal to or higher than 6, and the other core component having a Q value equal to or lower than 5, and (B) said sheath portion satisfying at least the following requirements (i) and (ii); (i) said sheath portion comprising a sheath component of a polyethylene base polymer having a melting point lower by at least 20° C. than the lower of the two melting points of said two core components; (ii) said sheath portion covering said core portion in a proportion of 25 to 55% by weight based on the total weight of said sheath portion and said core portion.
Claim 2
Dependent Claim
161 words
A heat-adhesive composite fiber comprising a core portion and a sheath portion, (A) said core portion being of the side-by-side type composite structure comprising two core components made of different polypropylene base polymers present in a composite ratio of 1:2 to 2:1, one of said core components having a Q value, expressed in terms of weight-average molecular weight/number-average molecular weight, equal to or higher than 6, and the other core component having a Q value equal to or lower than 5, and (B) said sheath portion satisfying at least the following requirements (i) and (ii); (i) said sheath portion comprising a sheath component of a polyethylene base polymer having a melting point lower by at least 20° C. than the lower of the two melting points of said two core components; (ii) said sheath portion covering said core portion in a proportion of 25 to 55% by weight based on the total weight of said sheath portion and said core portion.
Claim 3
Dependent Claim
20 words
A heat-adhesive composite fiber as defined in claim 1, wherein said sheath portion satisfies only said requirements (i) and (ii).
Claim 4
Dependent Claim
69 words
A heat-adhesive composite fiber as defined in claim 1, wherein said sheath portion satisfies said requirements (i) and (ii), and moreover has a number of aggregatable portions, at least latently releasable, which form many modular aggregates thereon by a heat treatment at a temperature higher than the melting point of said sheath component but lower than the lower one of the two melting points of said two core components.
Claim 5
Dependent Claim
28 words
A heat-adhesive composite fiber as defined in claim 1, 2 or 3, wherein said polypropylene base polymer of at least one of said two core components is polypropylene.
Claim 6
Dependent Claim
41 words
A heat-adhesive composite fiber as defined in claim 1, 2 or 3, wherein said polypropylene base polymer of at least one of said two core components is a copolymer of propylene with a small amount of an alpha-olefin other than propylene.
Claim 7
Dependent Claim
19 words
A heat-adhesive composite fiber as defined in claim 1, 2, or 3, wherein said polyethylene base polymer is polyethylene.
Claim 8
Dependent Claim
32 words
A heat-adhesive component fiber as defined in claim 1, 2 or 3, wherein said polyethylene base polymer is an ethylene-vinyl acetate copolymer having an ethylene content of 98 to 60% by weight.
References Cited (Backward Citations)
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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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |