US4649164A
Expired / Lapsed
US
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Foamed polymeric materials
Assignee: Dow Chemical Co
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Filing: 1985-07-03
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Granted: 1987-03-10
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Expires: 2005-07-03
Abstract
Abstract Foamed water-swellable polymeric water absorbent materials are prepared by contacting a polymer capable of having a water-swellable character and containing acid moieties in acid form with a blowing agent such as sodium bicarbonate, which blowing agent is capable of neutralizing the acid moieties of the polymer. The foamed polymers are useful in a wide variety of water absorbent applications.
Inventors
- 👤 Laurie J. Scott
- 👤 Robert E. Erickson
- 👤 Theodore C. Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:54
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08J9/04; C08J9/06; C08J9/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
79 words
A foamed, open-celled water-swellable polymeric absorbent material containing a plurality of neutralized acid moieties prepared by a process comprising contacting a polymer comprising from about 40 to about 50 weight percent of monomers containing pendant acid moieties in acid form which are polymerized to form the polymer, said polymer being capable of absorbing more than 15 times its weight in aqueous liquid with an acid-neutralizing blowing agent so as to neutralize an effective amount of the pendant acid moieties.
Claim 2
Dependent Claim
79 words
A foamed, open-celled water-swellable polymeric absorbent material containing a plurality of neutralized acid moieties prepared by a process comprising contacting a polymer comprising from about 40 to about 50 weight percent of monomers containing pendant acid moieties in acid form which are polymerized to form the polymer, said polymer being capable of absorbing more than 15 times its weight in aqueous liquid with an acid-neutralizing blowing agent so as to neutralize an effective amount of the pendant acid moieties.
Claim 3
Dependent Claim
17 words
A product of claim 1 wherein said polymer capable of having a water-swellable character is lightly crosslinked.
Claim 4
Dependent Claim
15 words
A product of claim 1 wherein said polymer is in the form of a latex.
Claim 5
Dependent Claim
11 words
A product of claim 1 wherein said polymer is simultaneously hydrolyzed.
Claim 6
Dependent Claim
8 words
An article comprising the product of claim 1.
Claim 7
Dependent Claim
40 words
The product of claim 1 wherein said polymer capable of having a water-swellable character is selected from the group consisting of carboxylic acid and sulfonic acid polyelectrolytes, polymers and copolymers of acrylic acids and esters and polymers of sulfonate monomers.
Claim 8
Dependent Claim
23 words
The product of claim 1 wherein said polymer capable of having a water-swellable character is a copolymer of ethyl acrylate and methacrylic acid.
Claim 9
Dependent Claim
84 words
A foamed, open-celled water-swellable polymeric water-absorbent material containing a plurality of neutralized acid moieties, prepared by a process comprising contacting a polymer comprising from about 40 to about 50 weight percent of monomers containing pendant acid moieties in acid form which are polymerized to form the polymer, said polymer being capable of absorbing more than 15 times its weight in aqueous liquid with an acid-neutralizing blowing agent so as to neutralize an effective amount of the pendant acid moieties and simultaneously crosslinking said polymer.
Claim 10
Dependent Claim
84 words
A foamed, open-celled water-swellable polymeric water-absorbent material containing a plurality of neutralized acid moieties, prepared by a process comprising contacting a polymer comprising from about 40 to about 50 weight percent of monomers containing pendant acid moieties in acid form which are polymerized to form the polymer, said polymer being capable of absorbing more than 15 times its weight in aqueous liquid with an acid-neutralizing blowing agent so as to neutralize an effective amount of the pendant acid moieties and simultaneously crosslinking said polymer.
Claim 11
Dependent Claim
17 words
A product of claim 8 wherein said polymer capable of having a water-swellable character is lightly crosslinked.
Claim 12
Dependent Claim
15 words
A product of claim 8 wherein said polymer is in the form of a latex.
Claim 13
Dependent Claim
11 words
A product of claim 8 wherein said polymer is simultaneously hydrolyzed.
Claim 14
Dependent Claim
8 words
An article comprising the product of claim 8.
Claim 15
Dependent Claim
40 words
The product of claim 8 wherein said polymer capable of having a water-swellable character is selected from the group consisting of carboxylic acid and sulfonic acid polyelectrolytes, polymers and copolymers of acrylic acids and esters and polymers of sulfonate monomers.
Claim 16
Dependent Claim
23 words
The product of claim 8 wherein said polymer capable of having a water-swellable character is a copolymer of ethyl acrylate and methacrylic acid.
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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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |