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Patent US4563497A successfully refreshed from Google Patents.
US4563497A
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Method for making water soluble solid polymers
Assignee: Roehm GmbH Darmstadt
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Filing: 1983-01-25
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Granted: 1986-01-07
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Expires: 2003-01-25
Abstract
Abstract (1) A method for making a water soluble synthetic solid polymer product, which method comprises polymerizing a solution of a water soluble monomer, or of a mixture of monomers which are exclusively or predominantly water soluble monomers, in an aqueous medium in the presence of 0.5 to 50 percent, by weight of said monomer or monomers, of at least one member selected from the group consisting of water soluble solid monosaccharides and oligosaccharides, and (2) the directly millable polymer product having a low degree of crosslinking which is prepared thereby and which is useful as a flocculant, dispersing agent, thickening agent, water treating agent, coating agent or the like.
Inventors
- 👤 Juergen Masanek
- 👤 Horst Pennewiss
- 👤 Hermann Plainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:39
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/04; C08F2/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
132 words
A method for making a hard, brittle composition which can be ground without prior removal of water therefrom, said composition comprising a water soluble synthetic polymer and having a solids content greater than 83 percent, which method comprises free-radically polymerizing a polymerization batch consisting essentially of an aqueous solution of a free-radically polymerizable water soluble monomer selected from the group consisting of non-ionic, anionic, cationic, and ampholytic acrylic and methacrylic monomers which are exclusively or predominantly water soluble, or of a mixture of such monomers, said polymerization proceeding in the presence of 0.5 to 50 percent, by weight of said monomer or monomers, of at least one member selected from the group consisting of water soluble solid monosaccharides and oligosaccharides, the solids content of said aqueous solution being greater than 83 percent.
Claim 2
Independent Claim
132 words
A method for making a hard, brittle composition which can be ground without prior removal of water therefrom, said composition comprising a water soluble synthetic polymer and having a solids content greater than 83 percent, which method comprises free-radically polymerizing a polymerization batch consisting essentially of an aqueous solution of a free-radically polymerizable water soluble monomer selected from the group consisting of non-ionic, anionic, cationic, and ampholytic acrylic and methacrylic monomers which are exclusively or predominantly water soluble, or of a mixture of such monomers, said polymerization proceeding in the presence of 0.5 to 50 percent, by weight of said monomer or monomers, of at least one member selected from the group consisting of water soluble solid monosaccharides and oligosaccharides, the solids content of said aqueous solution being greater than 83 percent.
Claim 3
Dependent Claim
21 words
A method as in claim 1 wherein said water soluble monomer is, or said mixture of monomers comprises, an anionic monomer.
Claim 4
Dependent Claim
39 words
A method as in claim 2 wherein said mixture of monomers comprises a first member selected from the group consisting of acrylamide and methacrylamide and a second member selected from the group consisting of acrylic acid and methacrylic acid.
Claim 5
Dependent Claim
19 words
A method as in claim 2 wherein the polymerization is carried out at a pH between 5 and 14.
Claim 6
Dependent Claim
19 words
A method as in claim 2 wherein the polymerization is carried out at a pH between 6 and 11.
Claim 7
Dependent Claim
21 words
A method as in claim 1 wherein said water soluble monomer is, or said mixture of monomers comprises, a cationic monomer.
Claim 8
Dependent Claim
50 words
A method as in claim 6 wherein said cationic monomer is, or said mixture of monomers comprises, a salt of a tertiaryamino ester or tertiaryamino amide of acrylic acid or of methacrylic acid, or a salt of a quaternaryamino ester or quaternaryamino amide of acrylic acid or of methacrylic acid.
Claim 9
Dependent Claim
40 words
A method as in claim 7 wherein said cationic monomer is selected from the group consisting of salts of dialkylaminoalkyl acrylates and methacrylates, salts of dialkylaminoalkyl acrylamides and methacrylamides, and quaternary ammonium salts of such acrylates, methacrylates, acrylamides, and methacrylamides.
Claim 10
Dependent Claim
17 words
A method as in claim 6 wherein the polymerization is carried out at a pH below 8.
Claim 11
Dependent Claim
19 words
A method as in claim 6 wherein the polymerization is carried out at a pH from 3 to 6.
Claim 12
Dependent Claim
28 words
A method as in claim 1 wherein said monosaccharide or oligosaccharide is present in an amount from 1 to 20 percent, by weight of the monomer or monomers.
Claim 13
Dependent Claim
21 words
A method as in claim 1 wherein said water soluble monomer is, or said mixture of water soluble monomers comprises, acrylamide.
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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) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |