US4056502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent articles made from carboxylic polyelectrolyte solutions containing bis-oxazoline crosslinker and methods for their preparation
Assignee: Dow Chemical Co
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Filing: 1974-08-05
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Granted: 1977-11-01
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Expires: 1994-08-05
Abstract
Abstract Water swellable absorbent articles, made from polyelectrolytes, containing free carboxylic groups, together with methods for their preparation, and a composition useful to make said articles are disclosed. The composition contains bis-oxazolines or bis imino oxazolidines. The articles are crosslinked by heating and/or removing substantially all of the water 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 06:50
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C; C08; C08F; C08F8/00; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/35; Y; Y10; Y10S; Y10S524/00; Y10S524/916
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
29 words
A solution useful to form water swellable articles of a carboxylic synthetic polyelectrolyte which comprises 1. a solvent consisting of water, or a mixture thereof with lower alcohols, 2.
Claim 2
Dependent Claim
29 words
A solution useful to form water swellable articles of a carboxylic synthetic polyelectrolyte which comprises 1. a solvent consisting of water, or a mixture thereof with lower alcohols, 2.
Claim 3
Dependent Claim
47 words
about 5 to about 60% by weight based on the amount of solvent of a carboxylic polyelectrolyte or mixtures thereof having free carboxylic acid groups, and 3. 0.05 to 5.0% by weight based on the polyelectrolyte of a bis-oxazoline or bis-imino-oxazolidino crosslinking agent reactive with carboxylic acid
Claim 4
Dependent Claim
47 words
about 5 to about 60% by weight based on the amount of solvent of a carboxylic polyelectrolyte or mixtures thereof having free carboxylic acid groups, and 3. 0.05 to 5.0% by weight based on the polyelectrolyte of a bis-oxazoline or bis-imino-oxazolidino crosslinking agent reactive with carboxylic acid
Claim 5
Dependent Claim
67 words
groups. 2. The solution as set forth in claim 1 wherein said crosslinking agent is selected from compounds having the formulas ##EQU2## wherein R 1 is a divalent radical selected from alkylidenes, arylidenes, and cyclomethylidenes, R 2 is an alkyl group of one to ten carbons, cyclohexyl and phenyl, R 3 is selected from a single bond; oxydiethylene or oxydibutylene; thiodiethylene or thiodibutylene; or ethylene, or tetramethylene.
Claim 6
Dependent Claim
22 words
The solution as set forth in claim 1 wherein crosslinking agent is present in the amount from 0.2 to 0.5% by weight.
Claim 7
Dependent Claim
21 words
The solution as set forth in claim 1 wherein the solution has a pH in the range from 1.0 to 6.5.
Claim 8
Dependent Claim
35 words
The solution as set forth in claim 2 wherein said crosslinking agent has the formula ##EQU3## wherein R 3 is selected from a single bond; oxydiethylene or oxydibutylene; thiodiethylene or thiodibutylene; or ethylene, or tetramethylene.
Claim 9
Dependent Claim
14 words
The solution as set forth in claim 5 wherein the crosslinking agent is 2,2'-bis(2-oxazoline).
Claim 10
Dependent Claim
14 words
The solution as set forth in claim 5 wherein the crosslinking agent is thiodiethylene-bis-(2-oxazoline).
Claim 11
Dependent Claim
14 words
The solution as set forth in claim 5 wherein the crosslinking agent is tetramethylene-bis-(2-oxazoline).
Claim 12
Dependent Claim
14 words
The solution as set forth in claim 5 wherein the crosslinking agent is oxydiethylene-bis-(2-oxazoline).
Claim 13
Dependent Claim
40 words
A method of preparing a water swellable polyelectrolyte which comprises the steps of 1. preparing a solution as set forth in claim 1, 2. evaporating about 75% of the solvent therefrom to obtain a substantially dry water swellable cross-linked polyelectrolyte.
Claim 14
Dependent Claim
39 words
A method of preparing a swellable polyelectrolyte which comprises the steps of 1. preparing a solution as set forth in claim 2, 2. evaporating about 75% of the solvent therefrom to obtain a substantially dry water swellable cross-linked polyelectrolyte.
Claim 15
Dependent Claim
14 words
The substantially dry water swellable cross-linked polyelectrolyte produced by the method of claim 10.
Claim 16
Dependent Claim
14 words
The substantially dry water swellable cross-linked polyelectrolyte produced by the method of claim 11.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |