Patent US3884754A successfully refreshed from Google Patents.
US3884754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow filaments and process for producing same
Assignee: Gun Ei Chemical Industry Co Ltd
•
Filing: 1973-02-21
•
Granted: 1975-05-20
•
Expires: 1993-02-21
Abstract
Abstract A hollow filament comprising a filamentary polymer composed predominantly of a flame-resistant and anti-fusing cured novolak resin, characterized in that the hollow structure continuously extends in the axial direction of the filament, the degree of hollowness thereof being in the range of 10 - 80%, and a process for producing the same 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 said 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, and thereafter removing the uncured core portion of said filament by extraction with a solvent.
Inventors
- 👤 Isao Kimura
- 👤 Hiroaki Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:20
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; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
77 words
A HOLLOW FILAMENT COMPRISING A FILAMENTARY POLYMER COMPOSED OF FROM 50% TO 100% BY WEIGHT OF A FLAME-RESISTANT AND ANTI-FUSING CURED NOVOLAK RESIN AND UP TO 50% BY WEIGHT OF A FIBER-FORMING THERMOPLASTIC SYNTHETIC RESIN SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF POLYAMIDES, POLYESTERS, POLYESTERETHERS, POLYOLEFINS AND POLYURETHANES, CHARACTERIZED IN THAT THE HOLLOW STRUCTURE CONTINUOUSLY EXTENDS IN THE AXIAL DIRECTION OF THE FILAMENT, THE DEGREE OF HOLLOWNESS THEREOF BEING IN THE RANGE OF 10-80%.
Claim 2
Dependent Claim
77 words
A HOLLOW FILAMENT COMPRISING A FILAMENTARY POLYMER COMPOSED OF FROM 50% TO 100% BY WEIGHT OF A FLAME-RESISTANT AND ANTI-FUSING CURED NOVOLAK RESIN AND UP TO 50% BY WEIGHT OF A FIBER-FORMING THERMOPLASTIC SYNTHETIC RESIN SELECTED FROM AT LEAST ONE OF THE GROUP CONSISTING OF POLYAMIDES, POLYESTERS, POLYESTERETHERS, POLYOLEFINS AND POLYURETHANES, CHARACTERIZED IN THAT THE HOLLOW STRUCTURE CONTINUOUSLY EXTENDS IN THE AXIAL DIRECTION OF THE FILAMENT, THE DEGREE OF HOLLOWNESS THEREOF BEING IN THE RANGE OF 10-80%.
Claim 3
Dependent Claim
19 words
The hollow filament of claim 1 characterized in that said degree of hollowness is in the range of 30-60%.
Claim 4
Dependent Claim
22 words
The filament of claim 1, in which the thermoplastic synthetic resin is present in an amount of at least 0.1% by weight.
Claim 5
Dependent Claim
18 words
The hollow filament of claim 3, characterized in that said fiber-forming thermoplastic synthetic resin is a polyamide resin.
Claim 6
Dependent Claim
42 words
The hollow filament of claim 3, characterized in that said resin is selected from the group consisting of nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, nylon 611, nylon 612, polyethylene terephthalate, polyethylene oxybenzoate, polyethylene and polypropylene, and their mixtures.
Claim 7
Dependent Claim
22 words
The filament of claim 3, in which the thermoplastic resin is present in an amount of from 5 to 30% by weight.
Claim 8
Dependent Claim
22 words
The filament of claim 6, in which the thermoplastic resin is present in an amount of from 10 to 25% by weight.
Claim 9
Dependent Claim
19 words
The filament of claim 2, in which the degree of hollowness is in the range of 40 to 55%.
Claim 10
Dependent Claim
20 words
The filament of claim 1, in which the novolak resin has an average molecular weight of up to about 5,000.
Claim 11
Dependent Claim
22 words
The filament of claim 9, in which the novolak resin has an average molecular weight of from about 300 to about 2,000.
Claim 12
Dependent Claim
29 words
The filament of claim 1, in which the novolak resin is the reaction product of an aldehyde and at least one of the group consisting of phenol and cresol.
Claim 13
Dependent Claim
19 words
The filament of claim 1, in which the novolak resin is the reaction product of formaldehyde and a phenol.
Claim 14
Dependent Claim
60 words
The filament of claim 1, in which the novolak resin is the reaction product of formaldehyde and at least one of the group consisting of phenol and cresol, the thermoplastic synthetic resin is nylon and is present in an amount of from 10 to 25% by weight, and the filament has a degree of hollowness of from 40 to 55%.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |