Patent US2716777A successfully refreshed from Google Patents.
US4350773A
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US
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Weakly acidic cation exchange resin and process for producing same
Assignee: Mitsubishi Chemical Corp
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Filing: 1981-07-06
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Granted: 1982-09-21
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Expires: 2001-07-06
Abstract
Abstract A weakly acidic cation exchange resin which is obtainable by a reaction of glyoxylic acid and a polyvinyl alcohol cross-linked by cross-linking groups each containing two or more carbon atoms, and has an exchange capacity of 3 meq/g or greater and a swelling volume of 10 ml/g or smaller, as well as a process for producing such cation exchange resin.
Inventors
- 👤 Takaharu Itagaki
- 👤 Hidenaga Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:56
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; C; C08; C08F; C08F8/00; C08F8/48; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
49 words
A weakly acidic cation exchange resin which is obtainable by a reaction of glyoxylic acid and a polyvinyl alcohol cross-linked by cross-linking groups each containing two or more carbon atoms, and has an exchange capacity of 3 meq/g or greater and a swelling volume of 10 ml/g or smaller.
Claim 2
Dependent Claim
49 words
A weakly acidic cation exchange resin which is obtainable by a reaction of glyoxylic acid and a polyvinyl alcohol cross-linked by cross-linking groups each containing two or more carbon atoms, and has an exchange capacity of 3 meq/g or greater and a swelling volume of 10 ml/g or smaller.
Claim 3
Dependent Claim
38 words
The weakly acidic cation exchange resin as defined in claim 1, wherein said swelling volume is 5 ml/g or smaller and the voluminal ratio of the Na form to H form of the resin is 3 or smaller.
Claim 4
Dependent Claim
19 words
The weakly acidic cation exchange resin is defined in claim 2, wherein said polyvinyl alcohol is cross-linked by glutaraldehyde.
Claim 5
Dependent Claim
19 words
The weakly acidic cation exchange resin as defined in claim 2, wherein said polyvinyl alcohol is cross-linked by epichlorohydrin.
Claim 6
Dependent Claim
70 words
A porous weakly acidic cation exchange resin which is obtainable by a reaction of glyoxylic acid and a polyvinyl alcohol cross-linked by cross-linking groups each containing two or more carbon atoms, and has an exchange capacity of 3 meq/g or greater, a swelling volume of 10 ml/g or smaller and a specific surface area of 0.5 m 2 /g or greater and/or a pore volume of 0.1 ml/g or greater.
Claim 7
Dependent Claim
70 words
A porous weakly acidic cation exchange resin which is obtainable by a reaction of glyoxylic acid and a polyvinyl alcohol cross-linked by cross-linking groups each containing two or more carbon atoms, and has an exchange capacity of 3 meq/g or greater, a swelling volume of 10 ml/g or smaller and a specific surface area of 0.5 m 2 /g or greater and/or a pore volume of 0.1 ml/g or greater.
Claim 8
Dependent Claim
21 words
The porous weakly acidic cation exchange resin as defined in claim 5, wherein said swelling volume is 5 ml/g or smaller.
Claim 9
Dependent Claim
24 words
The porous weakly acidic cation exchange resin as defined in claim 5, wherein said specific surface area is 5 m 2 /g or greater.
Claim 10
Dependent Claim
31 words
The porous weakly acidic cation exchange resin as defined in claim 5, wherein the voluminal ratio of the Na form to the H form of the resin is 2 or smaller.
Claim 11
Dependent Claim
20 words
The porous weakly acidic cation exchange resin as defined in claim 5, wherein said polyvinyl alcohol is crosslinked by glutaraldehyde.
Claim 12
Dependent Claim
20 words
The porous weakly acidic cation exchange resin as defined in claim 5, wherein said polyvinyl alcohol is crosslinked by epichlorohydrin.
Claim 13
Dependent Claim
25 words
The cation exchange resin of claim 1, wherein said polyvinyl alcohol is cross-linked by a member of the group consisting of glyoxal, glutaraldehyde and terephthaladehyde.
Claim 14
Dependent Claim
17 words
The cation exchange resin of claim 1, wherein said polyvinyl alcohol is cross-linked by 1,2-3, 4-diepoxy butane.
Claim 15
Dependent Claim
28 words
The cation exchange resin of claim 1, wherein said polyvinyl alcohol is cross-linked by a member selected from the group consisting of bis-epoxypropylether, ethyleneglycol bis-epoxypropylether and 1,4-butanediol bis-epoxypropylether.
Claim 16
Dependent Claim
17 words
The cation exchange resin of claim 1, wherein said polyvinyl alcohol is cross-linked by epichlorohydrin or epibromohydrin.
Claim 17
Dependent Claim
19 words
The cation exchange resin of claim 1, wherein the cation exchange groups contain a structure of the formula: ##STR3##
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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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |