US4310593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent articles cured with amine-epihalohydrin adducts
Assignee: Dow Chemical Co
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Filing: 1980-12-22
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Granted: 1982-01-12
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Expires: 2000-12-22
Abstract
Abstract Water absorbent articles, made from solutions of carboxylic polyelectrolytes, together with methods for their preparation, and a composition useful to make said articles are disclosed. The articles are cured and/or crosslinked with monomeric amine-epihalohydrin adducts by heating and/or removing substantially all of the solvent from the precursor composition. The absorbent articles are useful as surgical sponges, diapers, tampons, meat trays, bath mats and the like.
Inventors
- 👤 James R. Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:52
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C; C08; C08L; C08L33/00; C08L33/02; C08L63/00; Y; Y10; Y10S; Y10S526/00; Y10S526/93; Y10S526/936; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2982; Y10T428/31504; Y10T428/31855; Y10T442/00; Y10T442/20; Y10T442/2484
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
76 words
A curable composition useful to form water absorbent articles of a carboxylic synthetic polyelectrolyte which comprises a solution of (1) a member selected from the group consisting of water, lower alcohols, and mixtures thereof, (2) about 10 to about 60% by weight based on the amount of (1) of a carboxylic polyelectrolyte or mixtures thereof, and (3) an amount of a monomeric water soluble amine/epihalohydrin adduct sufficient to cure said polyelectrolyte into a water absorbent article.
Claim 2
Dependent Claim
76 words
A curable composition useful to form water absorbent articles of a carboxylic synthetic polyelectrolyte which comprises a solution of (1) a member selected from the group consisting of water, lower alcohols, and mixtures thereof, (2) about 10 to about 60% by weight based on the amount of (1) of a carboxylic polyelectrolyte or mixtures thereof, and (3) an amount of a monomeric water soluble amine/epihalohydrin adduct sufficient to cure said polyelectrolyte into a water absorbent article.
Claim 3
Dependent Claim
38 words
The composition of claim 1 wherein the monomeric water soluble adduct is the reaction product of two moles of an epihalohydrin with one mol of a mono, di, or tri amine having at least two free hydrogen atoms.
Claim 4
Dependent Claim
24 words
The composition of claim 2 wherein the reaction product is the reaction of two moles of an epihalohydrin with one mol of a monoamine.
Claim 5
Dependent Claim
24 words
The composition of claim 3 wherein the reaction product is the reacton of two moles of an epihalohydrin with one mol of a diamine.
Claim 6
Dependent Claim
24 words
The composition of claim 3 wherein the reaction product is the reaction of two moles of an epihalohydrin with one mol of a triamine.
Claim 7
Dependent Claim
24 words
The composition of claim 4 wherein the reaction product is the reaction of two moles of an epihalohydrin with one mol of a piperazine.
Claim 8
Dependent Claim
21 words
The composition of claims 1 or 2 wherein the amount of carboxylic polyelectrolyte is about 15 to about 40% by weight.
Claim 9
Dependent Claim
27 words
The composition of claims 1 or 2 wherein the carboxylic polyelectrolyte is an ammonium or alkali metal salt of the homopolymers of acrylic acid or methacrylic acid.
Claim 10
Dependent Claim
18 words
The composition of claim 8 wherein the amount of homopolymer is about 15 to about 40% by weight.
Claim 11
Dependent Claim
30 words
The composition of claims 1 or 2 wherein the carboxylic polyelectrolyte is an ammonium or alkali metal salt of the copolymers of acrylic or methacrylic acid with monoethylenically unsaturated monomers.
Claim 12
Dependent Claim
18 words
The composition of claim 10 wherein the amount of copolymer is about 15 to about 40% by weight.
Claim 13
Dependent Claim
28 words
The composition of claim 10 wherein the carboxylic polyelectrolyte consists of a terpolymer of ethyl acrylate, sodium acrylate, and sodium methacrylate with 50 mole percent being ethyl acrylate.
Claim 14
Independent Claim
40 words
A method of preparing a water absorbent polyelectrolyte which comprises the steps of (1) preparing a composition as set forth in claims 1 or 2, (2) evaporating about 75% of the solvent therefrom to obtain a substantially dry water-absorbent polyelectrolyte.
Claim 15
Dependent Claim
57 words
A method of preparing a substantially dry, water-absorbent polyelectrolyte film which comprises the steps of (1) preparing a composition as set forth in claim 1 or 2, (2) spreading a coating of said composition on an impervious substrate, (3) drying said coated substrate to crosslink said polyelectrolyte, and (4) separating said crosslinked polyelectrolyte film from said substrate.
Claim 16
Dependent Claim
50 words
A method of preparing an absorbent article coated with a substantially dry water absorbent polyelectrolyte which comprises (1) preparing a composition as set forth in claim 1 or 2, (2) applying a coating of said composition on a relatively thin article, (3) drying said coated article to crosslink said polyelectrolyte.
Claim 17
Dependent Claim
16 words
The method of claim 15 wherein the article is a natural or a synthetic fibrous substrate.
Claim 18
Dependent Claim
12 words
The method of claim 15 wherein the article is a synthetic film.
Claim 19
Dependent Claim
12 words
The method of claim 15 wherein the article is a foamed polymer.
Claim 20
Dependent Claim
34 words
A method of preparing a substantially dry water-absorbent particulate polyelectrolyte which comprises (1) preparing a film as set forth in claim 10, and (2) disintegrating said film to form flakes, strips, or powders thereof.
Claim 21
Dependent Claim
60 words
A method of preparing substantially dry water absorbent polyelectrolyte fibers which comprises (1) preparing a composition as set forth in claim 1 or 2, (2) extruding said composition into a bath comprising lower alkyl ketones or chlorinated hydrocarbons to form an extruded fiber, (3) separating the extruded fibers from said bath, and (4) drying said fibers to crosslink said polyelectrolyte.
Claim 22
Dependent Claim
9 words
The film prepared by the method of claim 14.
Claim 23
Dependent Claim
10 words
The particulate polyelectrolyte produced by the method of claim 19.
Claim 24
Dependent Claim
10 words
The polyelectrolyte fiber produced by the method of claim 20.
Claim 25
Dependent Claim
10 words
The coated article produced by the method of claim 15.
Claim 26
Dependent Claim
10 words
The coated article produced by the method of claim 16.
Claim 27
Dependent Claim
10 words
The coated article produced by the method of claim 17.
Claim 28
Dependent Claim
10 words
The coated article produced by the method of claim 18.
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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) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |