Patent US4507422A successfully refreshed from Google Patents.
US4507422A
Expired / Lapsed
US
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Water soluble polymers and dispersions containing them
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1984-05-21
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Granted: 1985-03-26
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Expires: 2004-05-21
Abstract
Abstract Pigment dispersions contain, as dispersing agent novel water soluble polymers containing acid groups, preferably polyacrylic acid or copolymers of polyacrylic acid with AMPS, having polydispersity below 1.5 and molecular weight in the range about 1,000 to about 5,000.
Inventors
- 👤 David Farrar
- 👤 Malcolm Hawe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:08
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/004; C08; C08F; C08F6/00; C08F6/04; C09D7/00; C09D7/40; C09D7/45
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
72 words
A dispersion of pigment in an aqueous medium containing a dispersing agent for the pigment and in which the dispersing agent is a water soluble polymer formed from one or more ethylenically unsaturated monomers comprising acidic monomers selected from acrylic acid and 2-acrylamido-2-methyl propane sulphonic acid, or a water soluble salt thereof, and which has PD below 1.5 and Mw (measured as the sodium salt) of from about 1,000 to about 5,000.
Claim 2
Dependent Claim
72 words
A dispersion of pigment in an aqueous medium containing a dispersing agent for the pigment and in which the dispersing agent is a water soluble polymer formed from one or more ethylenically unsaturated monomers comprising acidic monomers selected from acrylic acid and 2-acrylamido-2-methyl propane sulphonic acid, or a water soluble salt thereof, and which has PD below 1.5 and Mw (measured as the sodium salt) of from about 1,000 to about 5,000.
Claim 3
Dependent Claim
18 words
A dispersion according to claim 1 in which PD is 1.05 to 1.4 and Mw is below 4,000.
Claim 4
Dependent Claim
30 words
A dispersion according to claim 1 in which the polymer is polyacrylic acid or a copolymer of acrylic acid and 2-acrylamido-2-methyl propane sulphonic acid, or a water soluble salt thereof.
Claim 5
Dependent Claim
40 words
A dispersion of pigment in water containing a dispersing agent that is polyacrylic acid, or a water soluble salt thereof, having PD below 1.5 and Mw, measured on the full sodium salt, in the range about 1,000 to about 3,300.
Claim 6
Dependent Claim
40 words
A dispersion of pigment in water containing a dispersing agent that is polyacrylic acid, or a water soluble salt thereof, having PD below 1.5 and Mw, measured on the full sodium salt, in the range about 1,000 to about 3,300.
Claim 7
Dependent Claim
16 words
A dispersion according to claim 4 in which Mw is in the range 1,800 to 2,200.
Claim 8
Dependent Claim
22 words
A dispersion according to claim 4 in which the pigment is china clay and Mw is in the range 1,800 to 2,200.
Claim 9
Dependent Claim
33 words
A dispersion according to claim 4 in which the pigment is selected from china clay, talc, titanium dioxide and calcium carbonate and has a particle size in the range 0.1 to 50 microns.
Claim 10
Dependent Claim
13 words
A dispersion according to claim 4 in which PD is 1.05 to 1.4.
Claim 11
Dependent Claim
12 words
A dispersion according to claim 4 which is a paper coating dispersion.
Claim 12
Dependent Claim
39 words
A dispersion in water made by grinding calcium carbonate in water containing a dispersing agent that is polyacrylic acid, or a water soluble salt thereof, having PD below 1.5 and Mw in the range about 2,500 to about 4,500.
Claim 13
Dependent Claim
39 words
A dispersion in water made by grinding calcium carbonate in water containing a dispersing agent that is polyacrylic acid, or a water soluble salt thereof, having PD below 1.5 and Mw in the range about 2,500 to about 4,500.
Claim 14
Dependent Claim
18 words
A dispersion according to claim 10 in which Mw is in the range about 3,300 to about 3,900.
Claim 15
Dependent Claim
16 words
A dispersion according to claim 10 in which PD is in the range 1.05 to 1.4.
Claim 16
Dependent Claim
51 words
A dispersion in water made by grinding calcium carbonate in water containing a dispersing agent that is a copolymer of acrylic acid and 2-acrylamido-2-methyl propane sulphonic acid, or a salt thereof, having PD below 1.5 and Mw, measured on the full sodium salt, in the range about 1,500 to about 3,500.
Claim 17
Dependent Claim
51 words
A dispersion in water made by grinding calcium carbonate in water containing a dispersing agent that is a copolymer of acrylic acid and 2-acrylamido-2-methyl propane sulphonic acid, or a salt thereof, having PD below 1.5 and Mw, measured on the full sodium salt, in the range about 1,500 to about 3,500.
Claim 18
Dependent Claim
18 words
A dispersion according to claim 13 in which Mw is in the range about 2,250 to about 2,750.
Claim 19
Dependent Claim
16 words
A dispersion according to claim 13 in which PD is in the range 1.05 to 1.4.
Claim 20
Dependent Claim
46 words
An aqueous dispersion paint comprising a pigment, a binder for the paint and a dispersing agent for the pigment that is polyacrylic acid or a salt thereof having PD below 1.5 Mw, measured on the full sodium salt, in the range about 1,500 to about 5,000.
Claim 21
Dependent Claim
46 words
An aqueous dispersion paint comprising a pigment, a binder for the paint and a dispersing agent for the pigment that is polyacrylic acid or a salt thereof having PD below 1.5 Mw, measured on the full sodium salt, in the range about 1,500 to about 5,000.
Claim 22
Dependent Claim
14 words
A paint according to claim 16 in which PD is from 1.05 to 1.4.
Claim 23
Dependent Claim
18 words
A paint according to claim 16 in which Mw is in the range about 1,500 to about 4,500.
Claim 24
Dependent Claim
30 words
A paint according to claim 16 in which the pigment is selected from titanium dioxide, china clay and calcium carbonate and has a particle size of 0.2 to 25 microns.
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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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |