US4200735A
Expired / Lapsed
US
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Cellulosic ion exchange fibers and method for preparing same
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1979-02-26
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Granted: 1980-04-29
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Expires: 1999-02-26
Abstract
Abstract A cellulosic ion-exchange fiber having a functional group represented by the formula, ##STR1## wherein n is 1 or 2 and M is a hydrogen atom, alkali metal or ammonium residue, is produced by dipping a cellulosic fiber in an aqueous solution containing an intermediate of the formula, ##STR2## wherein n and M are as defined above; and X is halogen, in the presence of an alkali and applying heat treatment, thereby introducing the above-mentioned functional group.
Inventors
- 👤 Takezo Sano
- 👤 Ichiki Murase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:28
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/14; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
30 words
A cellulosic ion-exchange fiber having a functional group represented by the formula, ##STR5## wherein n is 1 or 2 and M is a hydrogen atom, alkali metal or ammonium residue.
Claim 2
Dependent Claim
30 words
A cellulosic ion-exchange fiber having a functional group represented by the formula, ##STR5## wherein n is 1 or 2 and M is a hydrogen atom, alkali metal or ammonium residue.
Claim 3
Dependent Claim
30 words
A cellulosic ion-exchange fiber according to claim 1, wherein said cellulosic ion-exchange fiber has an ion-exchange capacity of 0.1 to 1.3 meq/g (converted to the basis of sodium ion-exchange capacity).
Claim 4
Independent Claim
82 words
A method for producing a cellulosic ion-exchange fiber which comprises dipping a cellulosic fiber in an aqueous solution containing an intermediate of the formula, ##STR6## wherein n is 1 or 2, M is a hydrogen atom, alkali metal or ammonium residue and X is a chlorine, bromine or iodine atom, in the presence of an alkali and applying heat treatment, thereby introducing a functional group represented by the formula, ##STR7## wherein n and M are as defined above, onto the cellulosic fiber.
Claim 5
Independent Claim
82 words
A method for producing a cellulosic ion-exchange fiber which comprises dipping a cellulosic fiber in an aqueous solution containing an intermediate of the formula, ##STR6## wherein n is 1 or 2, M is a hydrogen atom, alkali metal or ammonium residue and X is a chlorine, bromine or iodine atom, in the presence of an alkali and applying heat treatment, thereby introducing a functional group represented by the formula, ##STR7## wherein n and M are as defined above, onto the cellulosic fiber.
Claim 6
Dependent Claim
28 words
A method according to claim 3, wherein said intermediate is produced by reacting an epihalohydrin with iminodiacetic acid, iminodipropionic acid or an alkali metal or ammonium salt thereof.
Claim 7
Dependent Claim
11 words
A method according to claim 4, wherein the epihalohydrin is epichlorohydrin.
Claim 8
Dependent Claim
20 words
A method according to claim 3, wherein the dipping is carried out at a temperature of 0° to 15° C.
Claim 9
Dependent Claim
15 words
A method according to claim 6, wherein the dipping temperature is 0° to 10° C.
Claim 10
Dependent Claim
25 words
A method according to claim 3, wherein the amount of alkali is 10 to 50 parts by weight per 100 parts by weight of water.
Claim 11
Dependent Claim
25 words
A method according to claim 8, wherein the amount of alkali is 15 to 45 parts by weight per 100 parts by weight of water.
Claim 12
Dependent Claim
27 words
A method according to claim 3, wherein the molar ratio of the intermediate to cellulose (as C 6 H 10 O 5 ) is 0.1/1 to 10/1.
Claim 13
Dependent Claim
27 words
A method according to claim 10, wherein the molar ratio of the intermediate to cellulose (as C 6 H 10 O 5 ) is 0.3/1 to 7/1.
Claim 14
Dependent Claim
21 words
A method according to claim 3, wherein the heat treatment is carried out at a temperature of 20° to 200° C.
Claim 15
Dependent Claim
16 words
A method according to claim 12, wherein the heat treatment temperature is 50° to 150° C.
Claim 16
Dependent Claim
29 words
A method according to claim 3, wherein the cellulosic ion exchange fiber has an ion-exchange capacity of 0.1 to 1.3 meq/g (converted to the basis of sodium ion-exchange capacity).
Claim 17
Dependent Claim
39 words
A filter material comprising a cellulosic ion-exchange fiber alone or as one component, having a functional group represented by the formula, ##STR8## wherein n is 1 or 2 and M is a hydrogen atom, alkali metal or ammonium residue.
Claim 18
Dependent Claim
39 words
A filter material comprising a cellulosic ion-exchange fiber alone or as one component, having a functional group represented by the formula, ##STR8## wherein n is 1 or 2 and M is a hydrogen atom, alkali metal or ammonium residue.
Claim 19
Dependent Claim
29 words
A filter material according to claim 15, wherein said cellulosic ion-exchange fiber has an ion-exchange capacity of 0.1 to 1.3 meq/g (converted to the basis of sodium ion-exchange capacity).
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |