Patent US4487864A successfully refreshed from Google Patents.
US4487864A
Expired / Lapsed
US
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Modified carbohydrate polymers
Assignee: Dow Quimica de Colombia SA
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Filing: 1983-04-28
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Granted: 1984-12-11
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Expires: 2003-04-28
Abstract
Abstract Water-soluble carbohydrate polymers are modified with crosslinked water-swellable organic polymers. The modified carbohydrate polymer compositions are useful as improved water retention aids for tile adhesive compositions, and as additives in spray plasters, wall finishing compounds, tape joint cements, wall paper adhesives, and the like.
Inventors
- 👤 Mauricio Bermudez
- 👤 Alberto L. Torres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:34
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C08L3/00; C08L3/02; C08L5/00; C08L5/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
47 words
A modified carbohydrate polymer composition comprising from about 50 to about 99.95 weight percent of a water-soluble carbohydrate polymer and from about 0.05 to about 50 weight percent of a crosslinked, water-swellable, nonflocculating partially hydrolyzed polyacrylamide wherein the polyacrylamide has a Flocculation Index of at least 0.60.
Claim 2
Dependent Claim
47 words
A modified carbohydrate polymer composition comprising from about 50 to about 99.95 weight percent of a water-soluble carbohydrate polymer and from about 0.05 to about 50 weight percent of a crosslinked, water-swellable, nonflocculating partially hydrolyzed polyacrylamide wherein the polyacrylamide has a Flocculation Index of at least 0.60.
Claim 3
Dependent Claim
28 words
The modified carbohydrate polymer composition of claim 1 wherein the partially hydrolyzed, crosslinked polyacrylamide is capable of retaining at least 50 grams of water per gram of polymer.
Claim 4
Dependent Claim
23 words
The modified carbohydrate polymer composition of claim 2 wherein the water-soluble carbohydrate polymer is a cellulose ether, guar or guar derivative, or starch.
Claim 5
Dependent Claim
18 words
The modified carbohydrate polymer composition of claim 3 wherein the carbohydrate polymer is hydroxypropylmethylcellulose, methylcellulose, hydroxyethylcellulose or hydroxyethylmethylcellulose.
Claim 6
Dependent Claim
22 words
The modified carbohydrate polymer of claim 1 comprising from about 0.3 to about 10 weight percent of the partially hydrolyzed, crosslinked polyacrylamide.
Claim 7
Dependent Claim
12 words
The modified carbohydrate polymer composition of claim 1 in a cementitious composition.
Claim 8
Dependent Claim
51 words
The modified carbohydrate polymer composition of claim 1 in a ceramic tile adhesive composition, said ceramic tile adhesive composition comprising from about 25 to 99.99 weight percent of Portland cement, 0 to 74.99 weight percent of an inert filler, and 0.01 to 10 weight percent of the modified carbohydrate polymer composition.
Claim 9
Dependent Claim
13 words
The modified carbohydrate polymer composition of claim 3 in a ceramic tile adhesive.
Claim 10
Dependent Claim
13 words
The modified carbohydrate polymer composition of claim 3 in a gypsum plaster composition.
Claim 11
Dependent Claim
14 words
The modified carbohydrate composition of claim 3 in a cement plaster or stucco composition.
Claim 12
Dependent Claim
12 words
The modified carbohydrate polymer composition of claim 3 in a wallpaper adhesive.
Claim 13
Dependent Claim
11 words
The modified carbohydrate polymer of claim 3 in a concrete composition.
Claim 14
Dependent Claim
21 words
The modified carbohydrate composition of claim 1, wherein the polyacrylamide of claim 1 has a Flocculation Index of at least 0.70.
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |