Patent US4284594A successfully refreshed from Google Patents.
US4284594A
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Method of manufacturing hollow fiber
Assignee: Zeon Corp
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Filing: 1979-12-11
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Granted: 1981-08-18
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Expires: 1999-12-11
Abstract
Abstract A method of manufacturing a hollow fiber in which a spinning solution of cellulose ester dissolved into an organic solvent is extruded from an annular slit, and simultaneously a core liquid is introduced into the inside hollow portion of the extruded spinning solution, the core liquid being selected from the group of hydroxycarboxylic acid, derivative of hydroxycarboxylic acid, monoterpene or these mixture, or consisting of a solution of the above-described compound or mixture.
Inventors
- 👤 Yasushi Joh
- 👤 Akihiko Niina
- 👤 Noriaki Kaneko
- 👤 Toshio Sano
- 👤 Noriyuki Ichige
- 👤 Koji Ichikawa
- 👤 Akira Fukutome
- 👤 Hisako Sonobe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:45
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/08; B01D69/087; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0016; B01D67/00165; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; D; D01; D01D; D01D5/00; D01D5/24; D01F; D01F2/00; D01F2/24; D01F2/28; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
In a method of manufacturing a hollow fiber characterized in that a spinning solution consisting essentially of cellulose ester dissolved in an organic solvent is extruded from an annular slit of an orifice while simultaneously introducing a core liquid into the inside hollow portion of the extruded spinning solution, the improvement comprising: (a) using a monoterpene or a solution of the monoterpene as core liquid; and (b) incorporating into the spinning solution a component which renders the monoterpene or the solution of the monoterpene nonmiscible with the spinning solution and develops phase separation therebetween.
Claim 2
Dependent Claim
94 words
In a method of manufacturing a hollow fiber characterized in that a spinning solution consisting essentially of cellulose ester dissolved in an organic solvent is extruded from an annular slit of an orifice while simultaneously introducing a core liquid into the inside hollow portion of the extruded spinning solution, the improvement comprising: (a) using a monoterpene or a solution of the monoterpene as core liquid; and (b) incorporating into the spinning solution a component which renders the monoterpene or the solution of the monoterpene nonmiscible with the spinning solution and develops phase separation therebetween.
Claim 3
Dependent Claim
33 words
The method according to claim 1 in which more than 20 percent by weight of said core liquid is monoterpene and less than 80 percent by weight of said core liquid is water.
Claim 4
Dependent Claim
79 words
The method according to claim 1 in which said monoterpene is an acyclic monoterpene selected from the group consisting of β-myrcene, ocimene and cryptotaenene, a monocyclic monoterpene such as limonene, d-limonene, l-limonene, dipentene, isolimonene, terpinolene, α-terpinene, γ-terpinene, β-terpinene, l-α-phellandrene, d-α-phellandrene, dl-α-phellandrene, β-phellandrene, 2,8(9)-p-menthadiene, d-sylvestrene, l-sylvestrene and dl-sylvestrene, or a bicyclic monoterpene selected from the group consisting of Δ 3 -carene, d-Δ 3 -carene, l-Δ 3 -carene, d-sabinene, l-sabinene, α-thujene, β-thujene, l-β-pinene, l-α-fenchene, d-β-fenchene, α-fenchene, cyclofenchene, orthodene, carane and trans-l-pinane.
Claim 5
Dependent Claim
48 words
The method according to claim 1, in which said spinning solution is extruded downward from said annular slit substantially in the perpendicular direction, and the extruded spinning solution is run through a gaseous space of at least 5 cm in length and then introduced into a coagulating bath.
Claim 6
Dependent Claim
42 words
The method according to claim 4, in which after the coagulation in said coagulating bath a coagulated filament of said spinning solution involving said core liquid in its hollow portion is subjected successively to washing, hydrolyzing to regenerate cellulose, neutralization and plasticizing.
Claim 7
Dependent Claim
19 words
The method according to claim 1 in which said organic solvent in said spinning solution consists essentially of acetone.
Claim 8
Dependent Claim
20 words
The method according to claim 1, in which said organic solvent in said spinning solution consist of acetone and formamide.
Claim 9
Dependent Claim
15 words
The method according to claim 7, in which said monoterpene is used as core liquid.
Claim 10
Dependent Claim
29 words
The method according to claim 8 in which said monoterpene is at least one member selected from the group consisting of d-limonene, l-limonene, dl-limonene, orange oil, and lemon oil.
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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |