US4145518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibers, filter rods and other nonwoven articles made from poly(1,2-propylene terephthalate)copolyesters of terephthalic acid, 1,2-propylene glycol and ethylene glycol
Assignee: Eastman Chemical Co
•
Filing: 1976-12-06
•
Granted: 1979-03-20
•
Expires: 1996-12-06
Abstract
Abstract This invention concerns fibers of amorphous polyesters of terephthalic acid or an ester forming derivative thereof and from about 60 mole percent to 100 mole percent 1,2-propylene glycol and from 0 to about 40 mole percent ethylene glycol. These fibers are useful for the production of bonded coherent cigarette filters, nonwoven fabrics and the like.
Inventors
- 👤 Gerald P. Morie
- 👤 Cephas H. Sloan
- 👤 Winston J. Jackson, Jr.
- 👤 Herbert F. Kuhfuss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:07
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; A; A24; A24D; A24D3/00; A24D3/06; A24D3/08; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/183; D01; D01F; D01F6/00; D01F6/78; D01F6/84; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/06; B01D2239/0604; B01D2239/0622; B01D2239/065; B01D2239/08; B01D2239/086; B01D2239/12; B01D2239/1233
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A fiber of a polyester of terephthalic acid or an ester forming derivative thereof and a glycol of from about 60 mole percent to 100 mole percent 1,2-propylene glycol and from 0 to about 40 mole percent ethylene glycol; said polyester having an inherent viscosity of at least about 0.35 in a 60/40 parts by weight solution of phenol/tetrachloroethane at 25° C. at a concentration of 0.5 gram of polyester in 100 ml. of said solvent, and a Tg of at least 80° C.
Claim 2
Dependent Claim
84 words
A fiber of a polyester of terephthalic acid or an ester forming derivative thereof and a glycol of from about 60 mole percent to 100 mole percent 1,2-propylene glycol and from 0 to about 40 mole percent ethylene glycol; said polyester having an inherent viscosity of at least about 0.35 in a 60/40 parts by weight solution of phenol/tetrachloroethane at 25° C. at a concentration of 0.5 gram of polyester in 100 ml. of said solvent, and a Tg of at least 80° C.
Claim 3
Dependent Claim
23 words
The fiber of claim 1 wherein the inherent viscosity is at least about 0.5 and the Tg is at least about 85° C.
Claim 4
Dependent Claim
30 words
The fiber of claim 1 wherein the ethylene glycol content of the polyester is from 10 to about 30 mole percent, and the inherent viscosity is at least about 0.5.
Claim 5
Dependent Claim
11 words
A continuous melt blown web of the fiber of claim 1.
Claim 6
Dependent Claim
11 words
A continuous melt blown web of the fiber of claim 2.
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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |