Patent US4330441A successfully refreshed from Google Patents.
US4330441A
Expired / Lapsed
US
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Solvent-soluble substances characterized in that water-soluble cellulose ethers are chemically bonded to water-soluble, at least predominately synthetic polymers containing acrylic units
Assignee: Dow Produktions und Vertriebs GmbH and Co OHG
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Filing: 1979-12-26
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Granted: 1982-05-18
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Expires: 1999-12-26
Abstract
Abstract Water soluble macromolecular substances obtained by reacting cellulose derivatives, a crosslinking agent and a synthetic resin, preferably an acrylic homo- or copolymer.
Inventors
- 👤 Branislaw Bohmer
- 👤 Lutz Hoppe
- 👤 Klaus Szablikowski
- 👤 Dieter Kudora
- 👤 Rudolf Behn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:38
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C04; C04B; C04B24/00; C04B24/24; C04B24/38
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A water-soluble macromolecular substance having a high capacity for dispersion, suspension and water-retention, said macromolecular substance consisting of a water-soluble cellulose ether joined via an at least bi-functional cross-linking agent to a water-soluble polymer component containing synthetic acrylic units or to said water-soluble polymer component containing synthetic acrylic units in admixture with a polymer of sodium alginate, of ethylene glycol, of propylene glycol, of vinyl alcohol or of an amide, said at least bifunctional cross-linking agent being selected from the group consisting of epichlorohydrin, glyoxal, glycidyl, paraformaldehyde, glutaric dialdehyde, maleic acid anhydride, epichlorohydrin polydiol, glycidyl methacrylate, N-methylol-acrylamide, ethylene glycol dimethacrylate, tetraallyloxyethane, tetraallyloxymethane, glyoxal-bis-acrylamide, bis-acrylamidoacetic acid, acrylamidoglycollic acid and reaction products of epichlorohydrin and bis-phenol-A.
Claim 2
Dependent Claim
114 words
A water-soluble macromolecular substance having a high capacity for dispersion, suspension and water-retention, said macromolecular substance consisting of a water-soluble cellulose ether joined via an at least bi-functional cross-linking agent to a water-soluble polymer component containing synthetic acrylic units or to said water-soluble polymer component containing synthetic acrylic units in admixture with a polymer of sodium alginate, of ethylene glycol, of propylene glycol, of vinyl alcohol or of an amide, said at least bifunctional cross-linking agent being selected from the group consisting of epichlorohydrin, glyoxal, glycidyl, paraformaldehyde, glutaric dialdehyde, maleic acid anhydride, epichlorohydrin polydiol, glycidyl methacrylate, N-methylol-acrylamide, ethylene glycol dimethacrylate, tetraallyloxyethane, tetraallyloxymethane, glyoxal-bis-acrylamide, bis-acrylamidoacetic acid, acrylamidoglycollic acid and reaction products of epichlorohydrin and bis-phenol-A.
Claim 3
Dependent Claim
15 words
A thickener for stabilizing dispersions, which comprises a macromolecular substance as claimed in claim 1.
Claim 4
Dependent Claim
23 words
An additive for improving the flow of liquid aqueous media by thickening them, which comprises a macromolecular substance as claimed in claim 1.
Claim 5
Dependent Claim
22 words
A flocculant for fluid physicochemically nonuniform substances which are to be separated, which comprises a macromolecular substance as claimed in claim 1.
Claim 6
Dependent Claim
19 words
A flocculant for working up inorganic and organic sludges, which comprises a macromolecular substance as claimed in claim 1.
Claim 7
Dependent Claim
31 words
A water-soluble macromolecular substance of claim 1 wherein the proportion of the at least bi-functional cross-linking component, based on the monomer units of the polymer is 1 to 25 mol %.
Claim 8
Dependent Claim
23 words
A water-soluble macromolecular substance of claim 6 wherein the proportion of the at least bi-functional cross-linking component is 1.4 to 20 mol %.
Claim 9
Dependent Claim
96 words
A water-soluble macromolecular substance of claim 1 wherein the water-soluble cellulose ether is selected from the group consisting of methyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose and carboxymethyl cellulose and the water-soluble polymer component containing synthetic acrylic units is a substance comprising structural units selected from the group consisting of homopolymers and copolymers of acrylamide, acrylamide derivatives, acrylic acid, methacrylic acid, 2-acrylamido-2-methylpropane-sulphonic acid, vinyl caprolactam, vinylpyrrolidone, acrylic acid esters, methacrylic acid esters, acrylonitrile, partly hydrolyzed acrylonitrile, acrylonitrile drivatives, graft copolymers of acrylamide on methyl cellulose and graft polymers of acrylamide and acrylic acid on methyl cellulose.
Claim 10
Dependent Claim
39 words
A water-soluble macromolecular substance of claim 1 wherein the proportions of the water-soluble polymer component containing synthetic acrylic units, based on the total weight of the cellulose ether component and said polymer component is 1 to 25% by weight.
Claim 11
Dependent Claim
20 words
A water-soluble macromolecular substance of claim 9 wherein the proportion of said polymer component is 1.8 to 9.0% by weight.
Claim 12
Dependent Claim
17 words
An additive for improving dry-plaster compositions based on gypsom comprising a water-soluble macromolecular substance of claim 1.
Claim 13
Dependent Claim
17 words
An additive for improving dry-plaster compositions based on cement comprising a water-soluble macromolecular substance of claim 1.
Claim 14
Dependent Claim
18 words
An additive for improving dry-plaster compositions based on cement mortor comprising a water-soluble macromolecular substance of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |