US4376199A
Expired / Lapsed
US
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Shaped material of chitin derivatives
Assignee: Kureha Corp
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Filing: 1980-10-17
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Granted: 1983-03-08
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Expires: 2000-10-17
Abstract
Abstract Disclosed herein is a novel shaped material of a derivative of chitin obtainable by partially acylating or partially acid-treating a cross-linked ionic chitin derivatives, which is excellent for use as the material for capsules, as material for dialysis carriers and/or as an ion-exchanger resin.
Inventors
- 👤 Junichi Koshugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:38
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/70; A61K31/715; A61M; A61M1/00; A61M1/36; A61M1/3679; B; B01; B01D; B01D15/00; B01D15/08; B01D71/00; B01D71/06; B01D71/08; B01J; B01J20/00; B01J20/22; B01J20/24; B01J39/00; B01J39/08; B01J39/16; C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/0027; C08B37/003; C12; C12N; C12N11/00; C12N11/02; C12N11/10; B01D15/26; B01D15/36; B01D15/361; B01D15/38; B01D15/3804
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A shaped material of a chitin derivative having a surface layer consisting essentially of chitin derivative obtained by acylation or acid-treatment of a 3,6' or 3,N,6' cross-linked ionic chitin-derivative of which the main structural unit is represented by the formula: ##STR7## wherein R 1 represents a hydrogen atom, --C n H 2n+1 or --(CH 2 ) n OH; R 2 represents a hydrogen atom, --C n' H 2n'+1 , --(CH 2 ) n OH, --(CH 2 ) n' CH(OH)CH 2 OH or --(CH 2 ) n' COOM, wherein n is an integer of 1 to 20, n' is an integer of 1 to 3 and M represents a hydrogen atom, an alkali metal atom or an atomic equivalent amount of an alkaline earth metal, or a de-N-acylated acyl chitin having an acyl group of --CO(CH 2 ) n-1 CH 3 and which is cross-linked at a rate of 0.01 to 0.3 per pyranose ring.
Claim 2
Dependent Claim
154 words
A shaped material of a chitin derivative having a surface layer consisting essentially of chitin derivative obtained by acylation or acid-treatment of a 3,6' or 3,N,6' cross-linked ionic chitin-derivative of which the main structural unit is represented by the formula: ##STR7## wherein R 1 represents a hydrogen atom, --C n H 2n+1 or --(CH 2 ) n OH; R 2 represents a hydrogen atom, --C n' H 2n'+1 , --(CH 2 ) n OH, --(CH 2 ) n' CH(OH)CH 2 OH or --(CH 2 ) n' COOM, wherein n is an integer of 1 to 20, n' is an integer of 1 to 3 and M represents a hydrogen atom, an alkali metal atom or an atomic equivalent amount of an alkaline earth metal, or a de-N-acylated acyl chitin having an acyl group of --CO(CH 2 ) n-1 CH 3 and which is cross-linked at a rate of 0.01 to 0.3 per pyranose ring.
Claim 3
Dependent Claim
32 words
The shaped material of claim 1 wherein the ionic chitin derivative is cross-linked between the positions of 3 and 6' or the positions of 3, nitrogen at position 2 and position 6'.
Claim 4
Dependent Claim
29 words
The shaped material of claim 1 wherein said surface is at least one derivative selected from the group consisting of chitin, O-acylated chitin, N-acylated chitosan and o-, N-diacylated chitosan.
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) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |