Patent CA1066835A successfully refreshed from Google Patents.
CA1066835A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Process for producing powdery water-soluble polymer
Assignee: Kyoritsu Yuki Co Ltd
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Filing: 1976-12-20
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Granted: 1979-11-20
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Expires: 1996-12-20
Abstract
Abstract Title of the Invention: PROCESS FOR PRODUCING POWDERY WATER-SOLUBLE POLYMER The aqueous gel of water-soluble acrylic polymer is mixed with a water-unsaturated salt such as anhydrous sodium sulfate, and the water component of aqueous gel is dehydrated as crystal water of said salt, then the polymer is easily powdered.
Inventors
- 👤 Masayuki Suzuki
- 👤 Kazuo Ikeda
- 👤 Masanori Uono
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-05 11:45
CPC Classifications
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Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
A process for producing from a hydrated water-soluble acrylic polymer containing more than 30% water content a water-soluble acrylic polymer in powdery form which comprises mixing the hydrated water-soluble acrylic polymer with a suffic-ient amount of water-unsaturated salt capable of taking up at least 5 molecules of water of crystallization per molecule of salt and which is selected from the group consisting of anhydrous sodium carbonate, sodium carbonate monohydrate, anhydrous sodium sulfate, anhydrous magnesium sulfate, magnesium sulfate monohydrate, anhydrous magnesium carbonate and anhydrous aluminum sulfate in an amount sufficient to remove a sufficient quantity of the water component of the hydrated acrylic water-soluble polymer as water of crystallization of a saturated salt hydrate of the salt so as to decrease the water content of the hydrated polymer to less than 30% and to produce a crushable mixture without heat drying of the acrylic polymer, the said water-unsaturated salt being the sole agent employed for decreasing the water content of the hydrated polymer.
Claim 2
Dependent Claim
162 words
A process for producing from a hydrated water-soluble acrylic polymer containing more than 30% water content a water-soluble acrylic polymer in powdery form which comprises mixing the hydrated water-soluble acrylic polymer with a suffic-ient amount of water-unsaturated salt capable of taking up at least 5 molecules of water of crystallization per molecule of salt and which is selected from the group consisting of anhydrous sodium carbonate, sodium carbonate monohydrate, anhydrous sodium sulfate, anhydrous magnesium sulfate, magnesium sulfate monohydrate, anhydrous magnesium carbonate and anhydrous aluminum sulfate in an amount sufficient to remove a sufficient quantity of the water component of the hydrated acrylic water-soluble polymer as water of crystallization of a saturated salt hydrate of the salt so as to decrease the water content of the hydrated polymer to less than 30% and to produce a crushable mixture without heat drying of the acrylic polymer, the said water-unsaturated salt being the sole agent employed for decreasing the water content of the hydrated polymer.
Claim 3
Dependent Claim
14 words
A process according to Claim 1, wherein the water-unsaturated salt is anhydrous sodium sulfate.
Claim 4
Dependent Claim
20 words
A process according to Claim 1, wherein the water-unsaturated salt is selected from anhydrous sodium carbonate and sodium carbonate monohydrate.
Claim 5
Dependent Claim
20 words
A process according to Claim 1, wherein the water-unsaturated salt is selected from anhydrous magnesium sulfate and magnesium sulfate monohydrate.
Claim 6
Dependent Claim
14 words
A process according to Claim 1, wherein the water-unsaturated salt is anhydrous aluminum sulfate.
Claim 7
Dependent Claim
43 words
A process according to Claim 1, wherein the water-soluble acrylic polymer is selected from polymers and copolymers of sodium acrylate, acrylamide, methacrylamide, dialkylamino-alkylmethacrylate and quaternary ammonium salt thereof, and a Mannich derivative of polyacrylamide obtained by reacting formaldehyde and an amine with polyacrylamide.
Claim 8
Dependent Claim
11 words
A process according to Claim 6, wherein water-soluble polymer is polyacrylamide.
Claim 9
Dependent Claim
13 words
A process according to Claim 1, wherein water-soluble polymer is partially hydrolyzed polyacrylamide.
Claim 10
Dependent Claim
23 words
The process of Claim 7, wherein the water-unsaturated salt is an anhydrous salt and the anhydrous salt is added to crushed hydrated polymer.
Claim 11
Dependent Claim
50 words
The process of Claim 7, wherein the water-unsaturated salt is an anhydrous salt and the anhydrous salt is added to the polymer, a powder is produced, polymer is physically separated from at least a portion of the salt hydrate produced from the anhydrous salt, and the separated polymer is crushed.
References Cited (Backward Citations)
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