US4041228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent articles and methods for their preparation
Assignee: Dow Chemical Co
•
Filing: 1975-05-09
•
Granted: 1977-08-09
•
Expires: 1995-05-09
Abstract
Abstract Water swellable absorbent articles, made from carboxylic polyelectrolytes, together with methods for their preparation, and a composition useful to make said articles are disclosed. The articles are crosslinked by heating and/or removing substantially all of the water from the precursor composition.
Inventors
- 👤 James Richard Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:04
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/16; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A method of preparing substantially water swellable polyelectrolyte fibers which comprises A. extruding a composition comprising 1. a solution of a carboxylic synthetic polyelectrolyte wherein the solution comprises water, lower alcohols, or mixtures thereof and about 5 to about 60% by weight of a carboxylic polyelectrolyte, and 2. at least about 0.1% by weight based on the polyelectrolyte of a crosslinking agent reactive with carboxylate groups into a bath comprising lower alkyl ketones or chlorinated hydrocarbons to form an extruded fiber, B. separating the extruded fiber from said bath, and C. heating said fibers to a temperature greater than about 30° C. to crosslink said polyelectrolyte fibers.
Claim 2
Independent Claim
107 words
A method of preparing substantially water swellable polyelectrolyte fibers which comprises A. extruding a composition comprising 1. a solution of a carboxylic synthetic polyelectrolyte wherein the solution comprises water, lower alcohols, or mixtures thereof and about 5 to about 60% by weight of a carboxylic polyelectrolyte, and 2. at least about 0.1% by weight based on the polyelectrolyte of a crosslinking agent reactive with carboxylate groups into a bath comprising lower alkyl ketones or chlorinated hydrocarbons to form an extruded fiber, B. separating the extruded fiber from said bath, and C. heating said fibers to a temperature greater than about 30° C. to crosslink said polyelectrolyte fibers.
Claim 3
Dependent Claim
23 words
A method as set forth in claim 1 wherein the crosslinking agent is present in the range from 0.1 - 10% by weight.
Claim 4
Dependent Claim
31 words
A method as set forth in claim 1 wherein the carboxylic polyelectrolyte consists of a terpolymer of ethyl acrylate, sodium acrylate, and sodium methacrylate with 50 mole percent being ethyl acrylate.
Claim 5
Dependent Claim
16 words
A method as set forth in claim 1 wherein the carboxylic polyelectrolyte consists of polysodium acrylate.
Claim 6
Dependent Claim
16 words
A method as set forth in claim 1 wherein the carboxylic polyelectrolyte consists of poly(isobutylenecodisodium maleate).
Claim 7
Dependent Claim
19 words
A method as set forth in claim 1 wherein the crosslinking agent is the diglycidyl ether of polypropylene glycol.
Claim 8
Dependent Claim
24 words
The method as set forth in claim 1 wherein said crosslinking agent is selected from polyhaloalkanols, sulfonium zwitterions, haloepoxyalkanes, polyglycidyl ethers, and mixtures thereof.
Claim 9
Dependent Claim
16 words
The method as set forth in claim 1 wherein the crosslinking agent is a polyglycidyl ether.
Claim 10
Dependent Claim
10 words
The polyelectrolyte fiber produced by the method of claim 1.
References Cited (Backward Citations)
US2578522A
Cited
US2935371A
Cited
US2914376A
Cited
US2955017A
Cited
US3068527A
Cited
US3242120A
Cited
US3714315A
Cited
US3502745A
Cited
US3468976A
Cited
US3489820A
Cited
US3798194A
Cited
US3637564A
Cited
US3677989A
Cited
US3766002A
Cited
US3931111A
Cited
US3843585A
Cited
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 |