US4542175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for thickening aqueous systems
Assignee: Roehm GmbH Darmstadt
•
Filing: 1983-08-12
•
Granted: 1985-09-17
•
Expires: 2003-08-12
Abstract
Abstract What is disclosed is a method for thickening aqueous systems in the acid range at a pH below 7 by the addition of an aqueous dispersion of a synthetic polymer having a molecular weight of at least 500,000, and which is water soluble or at least colloidally dispersible at a pH below 7, said polymer comprising (A) 5-100 percent by weight of at least one monomer having at least one basic nitrogen atom (B) 0-95 percent by weight of at least one monomer which has at most limited solubility in water, and (C) 0-30 percent by weight of at least one further non-basic, water soluble comonomer.
Inventors
- 👤 Herbert Fink
- 👤 Klaus Huebner
- 👤 Gerhard Markert
- 👤 Norbert Suetterlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:23
CPC Classifications
A; A61; A61Q; A61Q19/00; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/8141; A61K8/8152; B; B01; B01J; B01J19/00; B01J19/06; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/34; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3769; C11D3/3773; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23G; C23G1/00; C23G1/02; C23G1/025; D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/263
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
147 words
The method of thickening an aqueous system, which method comprises mixing the aqueous system with an aqueous dispersion, different from said aqueous system, of particles of a synthetic copolymer, free of acid groups, comprising (A) 20-100 percent by weight of a basic unsaturated free radically polymerizable monomer having a pK b -value from 3 to 6 and at least one basic nitrogen atom, (B) 0-95 percent by weight of a neutral unsaturated free radically polymerizable comonomer which has at most limited solubility in water, and (C) 0-30 percent by weight of a neutral unsaturated free radically polymerizable comonomer which is water soluble, said polymer having a molecular weight of at least 500,000 and being water soluble at a pH value below 7, said mixture of the aqueous system and aqueous dispersion having a pH value below 7, whereby said copolymer is present therein in a dissolved state.
Claim 2
Independent Claim
147 words
The method of thickening an aqueous system, which method comprises mixing the aqueous system with an aqueous dispersion, different from said aqueous system, of particles of a synthetic copolymer, free of acid groups, comprising (A) 20-100 percent by weight of a basic unsaturated free radically polymerizable monomer having a pK b -value from 3 to 6 and at least one basic nitrogen atom, (B) 0-95 percent by weight of a neutral unsaturated free radically polymerizable comonomer which has at most limited solubility in water, and (C) 0-30 percent by weight of a neutral unsaturated free radically polymerizable comonomer which is water soluble, said polymer having a molecular weight of at least 500,000 and being water soluble at a pH value below 7, said mixture of the aqueous system and aqueous dispersion having a pH value below 7, whereby said copolymer is present therein in a dissolved state.
Claim 3
Dependent Claim
49 words
A method as in claim 1 wherein said copolymer comprises, as component (A), units of an ester of an α,β-unsaturated polymerizable carboxylic acid, said ester having at least one basic nitrogen atom therein and the alcohol residue of said ester having a total of at least five carbon atoms.
Claim 4
Dependent Claim
43 words
A method as in claim 2 wherein said ester is an ester of an alkanol also containing a basic nitrogen atom and having an alkylene group with at least three carbon atoms between the ester oxygen atom thereof and said basic nitrogen atom.
Claim 5
Dependent Claim
31 words
A method as in claim 3 wherein the said alkylene group contains at least three carbon atoms in a straight chain between the ester oxygen atom and the basic nitrogen atom.
Claim 6
Dependent Claim
37 words
A method as in claim 1 wherein said aqueous system is admixed with such an amount of said aqueous dispersion of synthetic copolymer that a thickening of at least 10 percent is effected in said aqueous system.
Claim 7
Dependent Claim
46 words
A method as in claim 5 wherein the amount of aqueous dispersion of synthetic copolymer is such that the thickening effect, calculated as the product of the initial viscosity of the aqueous system and of the percentage thickening, has a value of at least 1,000 mPa.s.
Claim 8
Dependent Claim
20 words
A method as in claim 1 wherein said aqueous system is thickened to a viscosity of at least 1,000 mPa.s.
Claim 9
Dependent Claim
39 words
A method as in claim 1 wherein said aqueous dispersion of synthetic copolymer is admixed in an amount containing from 0.5 to 10 percent by weight of the synthetic copolymer, calculated on the water portion of the aqueous system.
Claim 10
Dependent Claim
22 words
A method as in claim 1 wherein said aqueous system to be thickened contains at least 20 percent by weight of water.
Claim 11
Dependent Claim
18 words
A method as in claim 1 wherein said aqueous system is an aqueous dispersion of a synthetic resin.
Claim 12
Dependent Claim
20 words
A method as in claim 10 wherein said synthetic resin is self-cross linking under the influence of an acid catalyst.
Claim 13
Dependent Claim
15 words
A method as in claim 2 wherein said component (A) is an ester of 3-dialkylamino-2,2-dimethylpropanol.
Claim 14
Dependent Claim
19 words
A method as in claim 1 wherein said synthetic compolymer comprises at most 60 percent by weight of component(A).
Claim 15
Dependent Claim
57 words
A method as in claim 1 wherein said synthetic copolymer comprises as component (B), at least 20 percent, by total weight of the polymer, of at least one member selected from the group consisting of alkyl esters of acrylic acid and of methacrylic acid, said ester having 1 to 4 carbon atoms in the alkyl portion thereof.
Claim 16
Dependent Claim
21 words
A method as in claim 1 wherein said synthetic resin copolymer comprises from 0.01 to 0.5 percent of a crosslinking agent.
References Cited (Backward Citations)
US3300429A
Cited
US3356627A
Cited
US3432454A
Cited
US3575881A
Cited
GB1393374A
Cited
US3947396A
Cited
GB2043081A
Cited
US4396734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |