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US4883536A
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Suspension of water-soluble polymers in aqueous media containing dissolved salts
Assignee: Aqualon Co
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Filing: 1988-08-05
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Granted: 1989-11-28
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Expires: 2008-08-05
Abstract
Abstract An aqueous suspension comprising 15% or more, by total weight of the suspension, of at least one anionic or nonionic water-soluble polymer dispersed in an aqueous solution of an ammonium salt having a multivalent anion, wherein the weight ratio of the ammonium salt to the water is at least 0.15, a process for preparing the same, and use of the same in a variety of applications, are disclosed.
Inventors
- 👤 Charles L. Burdick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:37
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J2300/00; C08J2300/10
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
56 words
An aqueous suspension consisting essentially of greater than 20%, by total weight of the suspension, of at least one anionic or nonionic water-soluble polymer dispersed in an aqueous solution of an ammonium salt having a multivalent anion, wherein the weight ratio of the multivalent ammonium salt to the water in the suspension is at least 0.15.
Claim 2
Dependent Claim
56 words
An aqueous suspension consisting essentially of greater than 20%, by total weight of the suspension, of at least one anionic or nonionic water-soluble polymer dispersed in an aqueous solution of an ammonium salt having a multivalent anion, wherein the weight ratio of the multivalent ammonium salt to the water in the suspension is at least 0.15.
Claim 3
Dependent Claim
15 words
The aqueous suspension of claim 1, wherein the water-soluble polymer is an anionic water-soluble polymer.
Claim 4
Dependent Claim
14 words
The aqueous suspension of claim 1, wherein the water-soluble polymer is nonionic water-soluble polymer.
Claim 5
Dependent Claim
45 words
The aqueous suspension of claim 1, wherein the nonionic or anionic water-soluble polymer is selected from the group consisting of natural gums and their derivatives, starch and its derivatives, partially and fully hydrolyzed polyvinyl alcohols, polyacrylamide polymers and copolymers, polyvinylpyrrolidone and derivatives thereof, and polyamides.
Claim 6
Dependent Claim
44 words
The aqueous suspension of claim 1, wherein the water-soluble polymer is selected from the group consisting of carboxymethylcellulose, anionic polyacrylamide, hydroxyethylcellulose , hydroxypropylcellulose, carboxymethylhydroxyethylcellulose, hydrophobically modified hydroxyethylcellulose , hydroxyethylhydroxypropylcellulose, polyvinyl alcohol, polyethylene oxide, xanthan gum, polyacrylamide, polyvinylpyrrolidone, methylhydroxypropylcellulose, methylhydroxyethylcellulose, guar, hydroxypropyl guar and 3-alkoxy-2-hydroxypropylcellulose.
Claim 7
Dependent Claim
31 words
The aqueous suspension of claim 1, wherein the water-soluble polymer is selected from the group consisting of sodium carboxymethylcellulose, anionic polyacrylamide, hydroxyethylcellulose , hydroxypropylcellulose , carboxymethylhydroxyethylcellulose 3-butoxy-2-hydroxypropylhydroxyethylcellulose and hydrophobically modified hydroxyethylcellulose.
Claim 8
Dependent Claim
35 words
The aqueous suspension of claim 1, wherein the aqueous suspension contains greater than 20% to 50%, based upon the total weight of the aqueous suspension, of the at least one anionic or nonionic water-soluble polymer.
Claim 9
Dependent Claim
35 words
The aqueous suspension of claim 4, wherein the aqueous suspension contains greater than 20% to 50%, based upon the total weight of the aqueous suspension, of the at least one anionic or nonionic water-soluble polymer.
Claim 10
Dependent Claim
33 words
The aqueous suspension of claim 1, wherein the aqueous suspension contains 22% to 35%, based upon the total weight of the aqueous suspension, of the at least one anionic or nonionic water-soluble polymer.
Claim 11
Dependent Claim
28 words
The aqueous suspension of claim 4, wherein the ammonium salt having a multivalent anion is selected from the group consisting of diammonium phosphate, diammonium sulfate and ammonium polyphosphate.
Claim 12
Dependent Claim
29 words
The aqueous suspension of claim 10, wherein the weight ratio of the ammonium salt having a multivalent anion to the water in the suspension formula is 0.18 to 0.6.
Claim 13
Dependent Claim
20 words
The aqueous suspension of claim 1, further containing up to 2%, by weight of the total suspension, of a stabilizer.
Claim 14
Dependent Claim
33 words
The aqueous suspension of claim 1, further containing up to 2%, by weight of the total suspension, of a stabilizer selected from the group consisting of fumed silica, clay, carboxymethylcellulose and xanthan gum.
Claim 15
Dependent Claim
17 words
The aqueous suspension of claim 13, wherein the polymer is hydroxyethylcellulose and the stabilizer is sodium carboxymethylcellulose.
Claim 16
Dependent Claim
13 words
The aqueous suspension of claim 1, having had entrained air removed by vacuum.
Claim 17
Dependent Claim
16 words
The aqueous suspension of claim 1, which is stable for at least three hours after preparation.
Claim 18
Dependent Claim
16 words
The aqueous suspension of claim 1, which is stable for at least one day after preparation.
Claim 19
Dependent Claim
16 words
The aqueous suspension of claim 1, which is stable for at least one month after preparation.
Claim 20
Dependent Claim
65 words
A process of preparing an aqueous suspension, consisting essentially of dissolving an ammonium salt having a multivalent anion in water and, then, dispersing therein greater than 20%, by total weight of the resultant suspension, of at least one anionic or nonionic water-soluble polymer, wherein in the resultant suspension the weight ratio of the ammonium salt to the water in the suspension is at least 0.15.
Claim 21
Dependent Claim
65 words
A process of preparing an aqueous suspension, consisting essentially of dissolving an ammonium salt having a multivalent anion in water and, then, dispersing therein greater than 20%, by total weight of the resultant suspension, of at least one anionic or nonionic water-soluble polymer, wherein in the resultant suspension the weight ratio of the ammonium salt to the water in the suspension is at least 0.15.
Claim 22
Dependent Claim
32 words
A process of preparing an aqueous solution of dissolved water-soluble polymer, comprising adding the aqueous suspension of claim 1 into an aqueous system in a manner such that the water-soluble polymer dissolves.
Claim 23
Dependent Claim
31 words
The aqueous suspension of claim 1, wherein the aqueous viscosity of the water-soluble polymer is on the order of 5,000 or more centipoise in a 5 weight % aqueous polymer solution.
Claim 24
Dependent Claim
31 words
The aqueous suspension of claim 4, wherein the aqueous viscosity of the water-soluble polymer is on the order of 5,000 or more centipoise in a 5 weight % aqueous polymer solution.
Claim 25
Dependent Claim
51 words
A process of preparing an aqueous suspension as claimed in claim 19, wherein the nonionic or anionic water-soluble polymer is selected from the group consisting of natural gums and their derivatives, starch and its derivatives, partially and fully hydrolyzed polyvinyl alcohols, polyacrylamide polymers and copolymers, polyvinylpyrrolidone and derivatives thereof, and polyamides.
Claim 26
Dependent Claim
32 words
A process as claimed in claim 19, wherein the aqueous viscosity of the water-soluble polymer is on the order of 5,000 or more centipoise in a 5 weight % aqueous polymer solution.
Claim 27
Dependent Claim
55 words
A process of preparing an aqueous solution of dissolved water-soluble polymer as claimed in claim 20 wherein the nonionic or anionic water-soluble polymer is selected from the group consisting of natural gums and their derivatives, starch and its derivatives, partially and fully hydrolyzed polyvinyl alcohols, polyacrylamide polymers and copolymers, polyvinylpyrrolidone and derivatives thereof, and polyamides.
Claim 28
Dependent Claim
32 words
A process as claimed in claim 20, wherein the aqueous viscosity of the water-soluble polymer is on the order of 5,000 or more centipoise in a 5 weight % aqueous polymer solution.
References Cited (Backward Citations)
US4069062A
Cited
US3894879A
Cited
US3894880A
Cited
US4325861A
Cited
US4283229A
Cited
US4312675A
Cited
US4296235A
Cited
US4364836A
Cited
US4792357A
Cited
US4726912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |