Patent US3887747A successfully refreshed from Google Patents.
US3887747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New hollow filamentary structures
Assignee: Gun Ei Chemical Industry Co Ltd
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Filing: 1973-02-21
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Granted: 1975-06-03
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Expires: 1993-02-21
Abstract
Abstract A process for producing a hollow carbon or ion-exchange filament which comprises treating a filament consisting of a fiber-forming polymer of predominantly an uncured novolak resin composition with a curing reagent in the presence of a curing catalyst to effect the cure of the filament extending from the peripheral portion to the axial portion thereof to a depth of 20-90% of the cross-sectional area of the filament, removing the uncured core portion of the filament by extraction with a solvent, and then subjecting the resulting hollow novolak resin filament to a carbonization treatment or introducing an ion-exchangeable group into the resulting hollow novolak resin filament; and products produced by this process.
Inventors
- 👤 Yoshio Tamura
- 👤 Koichiro Ohtomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:04
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/402; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D69/00; B01D69/08; B01D71/00; B01D71/02; B01D71/021; B01D71/06; B01D71/72; B01J; B01J47/00; B01J47/12; B01J47/127; D01; D01D; D01D5/00; D01D5/24; D01F; D01F6/00; D01F6/58; D01F6/76; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/24; D01F9/245; D01F9/26; D01F9/28; B01D2311/00; B01D2311/26; B01D2311/2623; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T442/00; Y10T442/30; Y10T442/3065; Y10T442/3089; Y10T442/3098; Y10T442/50; Y10T442/56; Y10T442/60; Y10T442/608; Y10T442/609; Y10T442/61
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A hollow ion-exchange novolak resin filament consisting essentially of from 50 to 100% by weight of a flame-resistant and anti-fusing cured novolak resin having an ion-exchange moiety and from 0 to 50% by weight of a fiber-forming thermoplastic synthetic resin selected from at least one of the group consisting of polyamide, polyester, polyolefin and polyurethane, with the provisos that the hollow structure continuously extends in the axial direction of the filament, and the rate of hollowness is from 10 to 80%.
Claim 2
Dependent Claim
81 words
A hollow ion-exchange novolak resin filament consisting essentially of from 50 to 100% by weight of a flame-resistant and anti-fusing cured novolak resin having an ion-exchange moiety and from 0 to 50% by weight of a fiber-forming thermoplastic synthetic resin selected from at least one of the group consisting of polyamide, polyester, polyolefin and polyurethane, with the provisos that the hollow structure continuously extends in the axial direction of the filament, and the rate of hollowness is from 10 to 80%.
Claim 3
Dependent Claim
81 words
A HOLLOW ION-EXCHANGE NOVOLAK RESIN FILAMENT CONSISTING ESSENTIALLY OF FROM 50 TO 100% BY WEIGHT OF A FLAME-RESISTANT AND ANTI-FUSING CURED NOVLAK RESIN HAVING A ION-EXCHANGE MOIETY AND FROM 0 TO 50% BY WEIGHT OF A FIBER-FORMING THERMOPLASTIC SYNTHETIC RESIN SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF POLYAMIDE, POLYESTER, POLYOLEFIN AND POLYU7URETHANE, WITH THE PROVISOS THAT THE HOLLOW STRUCTURE CONTINUOUSLY EXTENDS IN THE AXIAL DIRECTION OF THE FILAMENT, AND THE RATE OF HOLLOWNESS IS FROM 10 TO 80%.
Claim 4
Dependent Claim
81 words
A HOLLOW ION-EXCHANGE NOVOLAK RESIN FILAMENT CONSISTING ESSENTIALLY OF FROM 50 TO 100% BY WEIGHT OF A FLAME-RESISTANT AND ANTI-FUSING CURED NOVLAK RESIN HAVING A ION-EXCHANGE MOIETY AND FROM 0 TO 50% BY WEIGHT OF A FIBER-FORMING THERMOPLASTIC SYNTHETIC RESIN SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF POLYAMIDE, POLYESTER, POLYOLEFIN AND POLYU7URETHANE, WITH THE PROVISOS THAT THE HOLLOW STRUCTURE CONTINUOUSLY EXTENDS IN THE AXIAL DIRECTION OF THE FILAMENT, AND THE RATE OF HOLLOWNESS IS FROM 10 TO 80%.
Claim 5
Dependent Claim
13 words
The filament of claim 1 in which the thermoplastic synthetic resin is present.
Claim 6
Dependent Claim
43 words
The filament of claim 2 in which the thermoplastic synthetic resin is selected from at least one of the group consisting of nylon 5, nylon 11, nylon 12, nylon 66, nylon 610, nylon 611, nylon 612, polyethylene terephthalate, polyethylene oxybenzoate, polyethylene and polypropylene.
Claim 7
Dependent Claim
13 words
The filament of claim 3 in which the thermoplastic synthetic resin is nylon.
Claim 8
Dependent Claim
31 words
The filament of claim 1 in which the ion-exchange moiety is selected from the group consisting of: sulfonic acid-; carboxyl-; ammonium; primary, secondary and tertiary amino-; quaternary amino-: hydroxyl-; and halogen-moieties.
Claim 9
Dependent Claim
16 words
The filament of claim 1 in which the rate of hollowness is from 30 to 60%.
Claim 10
Dependent Claim
11 words
A filamentary structure derived from the filamentary polymer of claim 1.
Claim 11
Dependent Claim
26 words
The filamentary structure of claim 7 wherein said structure is in a form selected from fibers, yarns, knit fabrics, woven fabrics, non-woven fabrics, felt, or matting.
Claim 12
Dependent Claim
11 words
A filamentary structure derived from the filamentary polymer of claim 2.
References Cited (Backward Citations)
US3650102A
Cited
US3716521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |