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US4387186A
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Water swellable polymers
Assignee: GAF Corp
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Filing: 1981-06-29
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Granted: 1983-06-07
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Expires: 2001-06-29
Abstract
Abstract Water swellable monovalent alkali metal salt of crosslinked interpolymer of maleic anhydride, monovinyl alkyl ether and 1-5 mole percent crosslinking agent comprising divinyl ether of aliphatic diol.
Inventors
- 👤 Earl P. Williams
- 👤 Donald H. Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:22
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/04; C08F222/06; C08F216/00; C08F216/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
A water swellable but not water soluble composition consisting essentially of monovalent alkali metal salt of a crosslinked interpolymer consisting essentially of substantially equimolar quantities of maleic anhydride and a monovinyl alkyl ether wherein the alkyl group contains from 1 to 4 carbon atoms and from about 1 to about 5 mole percent, based on the monovinyl alkyl ether, of a crosslinking agent having a formula selected from the class consisting of: H.sub.2 C═CH--O--X.sub.1 --OCH═CH.sub.2 and H.sub.2 C═CH.sub.2 --(OX.sub.2).sub.n --OCH═CH.sub.2 where X 1 represents an alkylene group of two to twelve carbon atoms and X 2 represents an alkylene group of two to four carbon atoms and n represents an integer of 2 to 100.
Claim 2
Dependent Claim
115 words
A water swellable but not water soluble composition consisting essentially of monovalent alkali metal salt of a crosslinked interpolymer consisting essentially of substantially equimolar quantities of maleic anhydride and a monovinyl alkyl ether wherein the alkyl group contains from 1 to 4 carbon atoms and from about 1 to about 5 mole percent, based on the monovinyl alkyl ether, of a crosslinking agent having a formula selected from the class consisting of: H.sub.2 C═CH--O--X.sub.1 --OCH═CH.sub.2 and H.sub.2 C═CH.sub.2 --(OX.sub.2).sub.n --OCH═CH.sub.2 where X 1 represents an alkylene group of two to twelve carbon atoms and X 2 represents an alkylene group of two to four carbon atoms and n represents an integer of 2 to 100.
Claim 3
Dependent Claim
15 words
Water swellable composition of claim 1 wherein the monovinyl alkyl ether is methyl vinyl ether.
Claim 4
Dependent Claim
14 words
Water swellable composition of claim 1 wherein the monovinyl ether is ethyl vinyl ether.
Claim 5
Dependent Claim
24 words
Water swellable composition of claim 1, wherein the crosslinking agent has the formula: H.sub.2 C═CH--O--X.sub.1 --O--CH═CH.sub.2 in which X 1 represents a butylene radical.
Claim 6
Dependent Claim
26 words
Water swellable composition of claim 1 wherein the crosslinking agent has the formula CH.sub.2 ═CH(OX.sub.2).sub.n --OCH═CH.sub.2 in which X 2 is ethylene and n is 2.
Claim 7
Dependent Claim
12 words
Water swellable composition of claim 1 wherein the alkali metal is sodium.
Claim 8
Dependent Claim
12 words
Water swellable composition of claim 1 wherein the alkali metal is potassium.
Claim 9
Dependent Claim
40 words
Water swellable composition of claim 1 wherein the monovinyl alkyl ether is methyl vinyl ether, the alkali metal is sodium of potassium and the crosslinking agent has the formula: H.sub.2 C═CH--O--X.sub.1 --O--CH═CH.sub.2 in which X 1 represents a butylene radical.
Claim 10
Dependent Claim
42 words
Water swellable composition of claim 1 wherein the monovinyl alkyl ether is ethyl vinyl ether, the alkali metal is sodium or potassium and the crosslinking agent has the formula: CH.sub.2 ═CH(OX.sub.2).sub.n --OCH═CH.sub.2 in which X 2 is ethylene and n is 2.
References Cited (Backward Citations)
US3514419A
Cited
US3448088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |