US4486119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mesophase dope containing cellulose derivative and inorganic acid
Assignee: Asahi Kasei Corp
•
Filing: 1982-08-02
•
Granted: 1984-12-04
•
Expires: 2002-08-02
Abstract
Abstract A mesophase dope useful for producing shaped articles, for example, filaments and films, comprises at least 10% by weight of at least one cellulose derivative and the balance consisting of an aqueous solution of at least 5% by weight of at least one inorganic acid, the dope exhibiting the mesophase property even in the case where no fluid dynamic stress is applied thereto.
Inventors
- 👤 Kenji Kamide
- 👤 Kunihiko Okajima
- 👤 Toshihiko Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:05
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/24; D01F2/28; C; C08; C08K; C08K3/00; C08K3/01; C09; C09K; C09K19/00; C09K19/52; C09K19/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
A mesophase dope comprising at least 10% by weight of at least one cellulose ester having a degree of substitution (DS) of less than 2.7 and being dissolved in an aqueous solution of at least 5% by weight of at least one inorganic acid, said dope exhibiting a mesophase property even in the case where no fluid dynamic stress is applied thereto.
Claim 2
Dependent Claim
62 words
A mesophase dope comprising at least 10% by weight of at least one cellulose ester having a degree of substitution (DS) of less than 2.7 and being dissolved in an aqueous solution of at least 5% by weight of at least one inorganic acid, said dope exhibiting a mesophase property even in the case where no fluid dynamic stress is applied thereto.
Claim 3
Dependent Claim
24 words
A mesophase dope as claimed in claim 1, wherein said cellulose ester is selected from the group consisting of cellulose acetate and acetoxymethylcellulose acetate.
Claim 4
Dependent Claim
60 words
A mesophase dope as claimed in claim 1, wherein said inorganic acid is selected from the group consisting of hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, metaphosphoric acid, pyrophosphoric acid, hypophosphoric acid, sulfurous acid, fluorosulfuric acid, chlorosulfuric acid, chloric acid, hypochlorous acid, chlorous acid, perchloric acid, bromic acid, perbromic acid, hypobromous acid, hydrofluoric acid, thiocyanic acid, and thiosulfuric acid.
Claim 5
Dependent Claim
42 words
A mesophase dope as claimed in claim 1, wherein said inorganic acid is selected from the group consisting of hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, perchloric acid, pyrophosphoric acid, chlorosulfuric acid, thiosulfuric acid, metaphosphoric acid, thiocyanic acid, and bromic acid.
Claim 6
Dependent Claim
21 words
A mesophase dope as claimed in claim 1, wherein an aqueous solution of nitric acid or sulfuric acid contains cellulose acetate.
References Cited (Backward Citations)
US571530A
Cited
US1521876A
Cited
US1787542A
Cited
US1961251A
Cited
US3755297A
Cited
US4370168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |