US4007746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing cellulose acetate fiber rods
Assignee: Daicel Corp
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Filing: 1975-06-02
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Granted: 1977-02-15
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Expires: 1995-06-02
Abstract
Abstract A method for preparing a cellulose acetate fiber rod is provided, which is characterized by blooming a tow composed of cellulose acetate fibers, adding to or coating on the bloomed tow from 1 to 20 percent by weight (based on the weight of the cellulose acetate fibers) of a plasticizer comprising 1,4-butanediol diacetate, and gathering and curing the resulting cellulose acetate fibers at much higher speed than is possible in the conventional methods to form a cigarette filter rod which does not harm cigarette flavor and smoking taste.
Inventors
- 👤 Hideo Sawada
- 👤 Motoharu Kotani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:36
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/08; A24D3/10; D; D06; D06M; D06M13/00; D06M13/10; D06M13/224
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
74 words
In a method for preparing a cellulose acetate fiber rod, which comprises blooming a tow composed of cellulose acetate fibers, applying a plasticizer substantially uniformly to the bloomed tow, and gathering and curing the resulting bloomed tow to form a filter rod, the improvement which comprises: there is applied as a plasticizer from 1 to 20 percent by weight, based on the weight of the cellulose acetate fibers, of a plasticizer comprising 1,4-butanediol diacetate.
Claim 2
Dependent Claim
74 words
In a method for preparing a cellulose acetate fiber rod, which comprises blooming a tow composed of cellulose acetate fibers, applying a plasticizer substantially uniformly to the bloomed tow, and gathering and curing the resulting bloomed tow to form a filter rod, the improvement which comprises: there is applied as a plasticizer from 1 to 20 percent by weight, based on the weight of the cellulose acetate fibers, of a plasticizer comprising 1,4-butanediol diacetate.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the plasticizer-containing bloomed tow is cured at about 20° C for about 1 hour.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said plasticizer consists essentially of 1,4-butanediol diacetate.
Claim 5
Dependent Claim
47 words
The method of claim 1 wherein said plasticizer consists essentially of 1,4-butanediol diacetate and up to 80 percent by weight of at least one additional plasticizer selected from the group consisting of triacetin, the diacetate, dipropionate and dibutyrate esters of triethylene glycol, dimethoxyethyl phthalate and triethyl citrate.
Claim 6
Dependent Claim
27 words
The method of claim 1 in which the amount of plasticizer is from 5 to 10 percent by weight, based on the weight of cellulose acetate fibers.
Claim 7
Dependent Claim
54 words
A tobacco smoke filter comprising a bundle of from 3,000 to 100,000 substantially longitudinally extending cellulose acetate fibers each having a filament denier of 1 to 16, said fibers being substantially uniformly coated with from 1 to 20 percent by weight, based on the weight of said fibers, of a plasticizer comprising 1,4-butanediol diacetate.
Claim 8
Dependent Claim
54 words
A tobacco smoke filter comprising a bundle of from 3,000 to 100,000 substantially longitudinally extending cellulose acetate fibers each having a filament denier of 1 to 16, said fibers being substantially uniformly coated with from 1 to 20 percent by weight, based on the weight of said fibers, of a plasticizer comprising 1,4-butanediol diacetate.
Claim 9
Dependent Claim
32 words
A tobacco smoke filter according to claim 6, in which the amount of the plasticizer is from 5 to 10 percent by weight, based on the weight of said cellulose acetate fibers.
Claim 10
Dependent Claim
16 words
A tobacco smoke filter according to claim 6, wherein said plasticizer consists essentially of 1,4-butanediol diacetate.
Claim 11
Dependent Claim
50 words
A tobacco smoke filter according to claim 6, wherein said plasticizer consists essentially of 1,4-butanediol diacetate and up to 80 percent by weight of at least one additional plasticizer selected from the group consisting of triacetin, the diacetate, dipropionate and dibutyrate esters of triethylene glycol, dimethoxyethyl phthalate and triethyl citrate.
References Cited (Backward Citations)
US2017070A
Cited
US3882878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |