US3882878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing cigarette filter of cellulose acetate fibers
Assignee: Daicel Corp
•
Filing: 1973-08-22
•
Granted: 1975-05-13
•
Expires: 1993-08-22
Abstract
Abstract A method for preparing a cigarette filter of cullulose acetate fibers is provided, which is characterized by blooming a tow composed of cellulose acetate fibers, adding to the bloomed tow 1 to 20% by weight (based on the cellulose acetate fibers) of a plasticizer comprising as an ingredient at least one member selected from diacetate, dipropionate and dibutyrate esters of 1,3-butylene glycol, and gathering the thus treated bloomed tow.
Inventors
- 👤 Hideo Sawada
- 👤 Junji Kawamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:07
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/08; A24D3/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A METHOD FOR PREPARING A CIGARETTE FILTER OF CELLULOSE ACETATE FIBRES WHICH COMPRISES BLOOMING A TOW COMPOSED OF CELLULOSE ACETATE FIBERS, DISTURBING UNIFORMLY THROUGHOUT THE BLOOMED TOW FROM 1 TO 20% BY WEIGHT, BASED ON THE CELLULOSE ACETATE FIBERS, OF A PLASTICIZER COMPRISING AS AN INGREDIENT AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF THE DIACETATE, DIPROPIONATE AND DIBUTYRATE ESTERS OF 1,3-BUTYLENE GLYCOL, AND GATHERING THE THUS-TREATED BLOOMED TOW TO FORM A FILTER.
Claim 2
Independent Claim
75 words
A METHOD FOR PREPARING A CIGARETTE FILTER OF CELLULOSE ACETATE FIBRES WHICH COMPRISES BLOOMING A TOW COMPOSED OF CELLULOSE ACETATE FIBERS, DISTURBING UNIFORMLY THROUGHOUT THE BLOOMED TOW FROM 1 TO 20% BY WEIGHT, BASED ON THE CELLULOSE ACETATE FIBERS, OF A PLASTICIZER COMPRISING AS AN INGREDIENT AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF THE DIACETATE, DIPROPIONATE AND DIBUTYRATE ESTERS OF 1,3-BUTYLENE GLYCOL, AND GATHERING THE THUS-TREATED BLOOMED TOW TO FORM A FILTER.
Claim 3
Dependent Claim
27 words
A method according to claim 1, in which the plasticizer is added in an amount of 3 to 10% by weight based on the cellulose acetate fibers.
Claim 4
Dependent Claim
30 words
A method according to claim 1, in which the cellulose acetate fiber tow is obtained by gathering 5,000 to 100,000 continuous fibers having a size of 1 to 16 deniers.
Claim 5
Dependent Claim
23 words
A method according to claim 3, in which the tow has 10 to 30 uniform crimps per 25 mm of the tow length.
Claim 6
Dependent Claim
14 words
A method according to claim 1, wherein said plasticizer consists essentially of said ingredient.
Claim 7
Dependent Claim
18 words
A method according to claim 1, wherein said plasticizer contains at least 50% by weight of said ingredient.
Claim 8
Dependent Claim
32 words
A method according to claim 6, wherein the remainder of said plasticizer is a substance selected from the group consisting of triacetin and the diacetate, dipropionate and dibutyrate esters of polyethylene glycol.
Claim 9
Dependent Claim
103 words
A method according to claim 1, in which the filter is cured at room temperature and the amount of said ingredient applied to the fibers is effective to impart to the filter a hardness of less than 10 units after curing at room temperaturE for one hour, wherein hardness is measured by imposing a load of 300 g onto the filter by means of a disc having a diameter of 12 mm for 10 seconds and measuring the depth of the indentation thereby formed in the filter and wherein one hardness unit is equal to 0.1 millimeter of the depth of the indentation.
Claim 10
Dependent Claim
68 words
A tobacco smoke filter comprising a bundle of substantially longitudinally extending cellulose acetate fibers having a size of from 1 to 16 denier per fiber, said fibers being substantially uniformly coated with from 1 to 20% by weight, based on the weight of the fibers, of a plasticizer of at least one member selected from the group consisting of the diacetate, dipropionate and dibutyrate esters of 1,3-butylene glycol.
Claim 11
Dependent Claim
68 words
A tobacco smoke filter comprising a bundle of substantially longitudinally extending cellulose acetate fibers having a size of from 1 to 16 denier per fiber, said fibers being substantially uniformly coated with from 1 to 20% by weight, based on the weight of the fibers, of a plasticizer of at least one member selected from the group consisting of the diacetate, dipropionate and dibutyrate esters of 1,3-butylene glycol.
Claim 12
Dependent Claim
30 words
A tobacco smoke filter according to claim 9, in which the amount of plasticizer is from 3 to 10% by weight, based on the weight of the cellulose acetate fibers.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |