EP0013181A2
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EP
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Chitin derivative, material comprising said derivative and process for the preparation thereof
Assignee: Kureha Corp
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Filing: 1979-12-28
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Granted: —
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Expires: 1999-12-28
Abstract
Abstract A chitin derivative obtained by acylation of a de-N-acetylated and etherified chitin represented by the formula: [C6H8O3 . (NH2)x . (NHCOCH3)y . (OR)a . (OH)b]n wherein R represents at least one group selected from a carboxyalkyl group with two to four carbon atoms, a hydroxyethyl group, a hydroxypropyl group, a dihydroxypropyl group or an alkyl group with one to three carbon atoms, x is a number of 0.1 to 1.0, y = 1.0 - x, a is a number of 0.1 to 1.0, and b = 1.0 - a. or a salt thereof can form at least the outer surface of a material. This chitin derivative is insoluble in water, acids, alkaline solutions and organic solvents. The materials comprising the chitin derivative can be employed to seprate materials on a column, as a base material on which enzymes are immobilized, as a dialysis membrane and as an adsorbent.
Inventors
- 👤 Junichi Koshugi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 05:26
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/0027; C08B37/003; B; B01; B01D; B01D71/00; B01D71/06; B01D71/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
85 words
A chitin derivative obtained by acylation of a de-N-acetylated and etherified chitin represented by the formula (1): wherein R represents at least one group selected from a carboxyalkyl group with two to four carbon atoms, a hydroxyethyl group, a hydroxypropyl group, a dihydroxypropyl group or an alkyl group with one to three carbon atoms, x is a number of 0.1 to 1.0, y = 1.0 - x, a is a number of 0.1 to 1.0, and b = 1.0 - a, or a salt thereof.
Claim 2
Dependent Claim
85 words
A chitin derivative obtained by acylation of a de-N-acetylated and etherified chitin represented by the formula (1): wherein R represents at least one group selected from a carboxyalkyl group with two to four carbon atoms, a hydroxyethyl group, a hydroxypropyl group, a dihydroxypropyl group or an alkyl group with one to three carbon atoms, x is a number of 0.1 to 1.0, y = 1.0 - x, a is a number of 0.1 to 1.0, and b = 1.0 - a, or a salt thereof.
Claim 3
Dependent Claim
36 words
A chitin derivative according to claim 1, wherein the de-N-acetylated and etherified chitin is a de-N-acetylated carboxymethylchitin, a de-N-acetylated carboxyethylchitin, a de-N-acetylated carboxypropylchitin, a de-N-acetylated methylchitin, a de-N-acetylated ethylchitin, a de-N-acetylated propylchitin or a salt thereof.
Claim 4
Dependent Claim
26 words
A chitin derivative according to claim 1 or 2, wherein the salt is an alkali metal salt, an alkaline earth metal salt or an ammonium salt.
Claim 5
Dependent Claim
30 words
A chitin derivative according to any one of the preceding claims wherein the degree of etherification of the de-N-acetylated and etherified chitin is from 0.3 to 1.0 per pyranose ring.
Claim 6
Dependent Claim
50 words
A chitin derivative according to any one of the preceding claims wherein the de-N-acetylated and etherified chitin is a de-N-acetylated carboxymethylchitin, a de-N-acetylated carboxyethylchitin, a de-N-acetylated carboxypropylchitin, a de-N-acetylated hydroxyethychitin, a de-N-acetylated hydroxypropylchitin, a de-N-acetylated dihydroxypropylchitin or a salt thereof with a degree of de-N-acetylation of from 0.2 to 0.6.
Claim 7
Dependent Claim
42 words
A chitin derivative according to any one of claims 1 to 4, wherein the de-N-acetylated and etherified chitin is a de-N-acetylated methylchitin, a de-N-acetylated ethylchitin, a de-N-acetylated propylchitin or a salt thereof with a degree of de-N-acetylation of from 0.5 to 1.0.
Claim 8
Dependent Claim
17 words
A chitin derivative according to claim 6 wherein the degree of de-N-acetylation is from 0.5 to 0.9.
Claim 9
Dependent Claim
26 words
A chitin derivative according to any one of the preceding claims, wherein at least two different R substituents are present in the de-N-acetylated and etherified chitin.
Claim 10
Dependent Claim
22 words
A material at least the outer surface of which comprises a chitin derivative as claimed in any one of the preceding claims.
Claim 11
Dependent Claim
9 words
A material according to claim 9 which is shaped.
Claim 12
Dependent Claim
27 words
A material according to claim 9 or 10 which is in the form of a granule, sphere, film, fiber, hollow fiber, rod or any other three-dimensional structure.
Claim 13
Dependent Claim
16 words
A material according to any one of claims 9 to 11 which has a cellular structure.
Claim 14
Dependent Claim
28 words
A material according to any one of claims 9 to 12 the interior of which comprises the de-N-acetylated and etherified chitin of formula (I) or a salt thereof.
Claim 15
Dependent Claim
54 words
A process for producing a chitin derivative as claimed in any one of claims 1 to 8 or a material as claimed in any one of claims 9 to 13 which process comprises contacting an aqueous solution of the de-N-acetylated and etherified chitin or a salt thereof with an anhydride or an organic acid.
Claim 16
Dependent Claim
24 words
A process according to claim 14 wherein the organic acid anhydride is the anhydride of an aliphatic or aromatic acid or a mixture thereof.
Claim 17
Dependent Claim
26 words
A process according to claim 14 or 15 wherein the de-N-acetylated and etherified chitin contacts the organic acid anhydride in the presence of an organic acid.
Claim 18
Dependent Claim
33 words
A process according to any one of claims 14 to 16, wherein the aqueous solution of the de-N-acetylated and etherified chitin contacts a mixture of the organic acid anhydride and a suspending agent.
Claim 19
Dependent Claim
20 words
A process according to any one of claims 14 to 17 wherein after acylation the acylated reaction product is cross-linked.
References Cited (Backward Citations)
No citation records indexed.
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