US4041231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water swellable articles
Assignee: Dow Chemical Co
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Filing: 1975-06-30
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Granted: 1977-08-09
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Expires: 1995-06-30
Abstract
Abstract Water swellable polyacrylate articles are made from a solution of the polyacrylate having an effective amount of a soluble crosslinking agent therein by heating and/or drying the solution. The polyacrylate solution is made from a polyacrylate by saponification and the crosslinking agent is then added.
Inventors
- 👤 James R. Gross
- 👤 Russell T. McFadden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:34
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/28; D01F6/36; C; C08; C08F; C08F8/00; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/15; C08K5/151; C08K5/1515; C08L; C08L33/00; C08L33/02; C08L35/00; C08L63/00; Y; Y10; Y10S; Y10S526/00; Y10S526/93
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
63 words
A method of preparing substantially water swellable polyacrylate fibers which comprises A. extruding a solution into a bath comprising lower alkyl ketones or chlorinated hydrocarbons to form an extruded fiber wherein said solution is prepared by forming a polyacrylate solution having about 30 to about 70 weight percent alkali metal carboxylates by dissolving in an aqueous alkali metal hydroxide solution a polyacrylate comprising
Claim 2
Independent Claim
63 words
A method of preparing substantially water swellable polyacrylate fibers which comprises A. extruding a solution into a bath comprising lower alkyl ketones or chlorinated hydrocarbons to form an extruded fiber wherein said solution is prepared by forming a polyacrylate solution having about 30 to about 70 weight percent alkali metal carboxylates by dissolving in an aqueous alkali metal hydroxide solution a polyacrylate comprising
Claim 3
Dependent Claim
135 words
about 30 to about 92 percent by weight of an alkyl acrylate wherein the alkyl group has 1-10 carbon atoms, an alkyl methacrylate wherein the alkyl group has 4-10 carbon atoms, or mixtures thereof, 2. about 8 to about 50 percent by weight of an olefinically unsaturated carboxylic acid, and 3. about 0 to about 15 percent by weight of an omega hydroxy-alkyl acrylate having 1-4 carbon atoms in the hydroxy alkyl group heating the solution until saponification is complete, and adding to said solution about 0.1 to about 10 weight percent, based on the dissolved polymer, of a water soluble crosslinking agent which is reactive with carboxylate salt groups, B. separating the extruded fiber from said bath, and C. heating said fibers to a temperature greater than about 30° C. to crosslink said polyacrylate.
Claim 4
Dependent Claim
135 words
about 30 to about 92 percent by weight of an alkyl acrylate wherein the alkyl group has 1-10 carbon atoms, an alkyl methacrylate wherein the alkyl group has 4-10 carbon atoms, or mixtures thereof, 2. about 8 to about 50 percent by weight of an olefinically unsaturated carboxylic acid, and 3. about 0 to about 15 percent by weight of an omega hydroxy-alkyl acrylate having 1-4 carbon atoms in the hydroxy alkyl group heating the solution until saponification is complete, and adding to said solution about 0.1 to about 10 weight percent, based on the dissolved polymer, of a water soluble crosslinking agent which is reactive with carboxylate salt groups, B. separating the extruded fiber from said bath, and C. heating said fibers to a temperature greater than about 30° C. to crosslink said polyacrylate.
Claim 5
Dependent Claim
26 words
The method as set forth in claim 1 wherein the polyacrylate which is dissolved comprises 85 weight percent ethyl acrylate and 15 weight percent methacrylic acid.
Claim 6
Dependent Claim
18 words
The method as set forth in claim 1 wherein the water soluble crosslinking agent is a polyglycidyl ether.
Claim 7
Dependent Claim
16 words
The method as set forth in claim 3 wherein the polyglycidyl ether is glycerine diglycidyl ether.
Claim 8
Dependent Claim
9 words
The fibers prepared by the method of claim 1.
Claim 9
Dependent Claim
9 words
The fibers prepared by the method of claim 2.
Claim 10
Dependent Claim
9 words
The fibers prepared by the method of claim 3.
Claim 11
Dependent Claim
9 words
The fibers prepared by the method of claim 4.
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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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |