Patent US3272927A successfully refreshed from Google Patents.
US4460732A
Expired / Lapsed
US
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Particulate dispersions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1983-06-17
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Granted: 1984-07-17
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Expires: 2003-06-17
Abstract
Abstract A dispersion in an aqueous medium of an organic particulate solid substantially all the particles of which have a size less than 100 microns which dispersion contains a polymeric composition which is soluble in the aqueous medium and which comprises a copolymer of at least one hydrophobic monomer as herein defined and at least one hydrophilic monomer as herein defined.
Inventors
- 👤 Richard Buscall
- 👤 Terence Corner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:32
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; C09B67/0085; C09B67/009; C09K; C09K23/00; C09K23/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
In a dispersion in an aqueous medium of an organic particulate solid, substantially all the particles of which have a size less than 100 microns, which dispersion contains a polymeric composition which (a) is soluble in the aqueous medium and (b) comprises a copolymer of at least one hydrophobic monomer and at least one hydrophilic monomer, the improvement in which the said at least one hydrophobic monomer provides less than 20% by weight of the copolymer and is selected from the class consisting of long chain alkyl, containing 12 to 18 carbon atoms, or aryl esters of an acrylic or C 1-15 -alkacrylic acid; vinyl-esters of a long chain alkanoic acids having 6-30 carbon atoms; and vinyl aromatic compounds and vinyl-ended macromers thereof, and the said at least one hydrophilic monomer provides more than 80% by weight of the copolymer and contains an acidic group and/or a salt thereof.
Claim 2
Dependent Claim
149 words
In a dispersion in an aqueous medium of an organic particulate solid, substantially all the particles of which have a size less than 100 microns, which dispersion contains a polymeric composition which (a) is soluble in the aqueous medium and (b) comprises a copolymer of at least one hydrophobic monomer and at least one hydrophilic monomer, the improvement in which the said at least one hydrophobic monomer provides less than 20% by weight of the copolymer and is selected from the class consisting of long chain alkyl, containing 12 to 18 carbon atoms, or aryl esters of an acrylic or C 1-15 -alkacrylic acid; vinyl-esters of a long chain alkanoic acids having 6-30 carbon atoms; and vinyl aromatic compounds and vinyl-ended macromers thereof, and the said at least one hydrophilic monomer provides more than 80% by weight of the copolymer and contains an acidic group and/or a salt thereof.
Claim 3
Dependent Claim
18 words
A dispersion as claimed in claim 1 wherein the acidic group is a carboxylic and/or a sulphonic acid.
Claim 4
Dependent Claim
43 words
A dispersion as claimed in claim 2 wherein the carboxylic acid is a mono-olefinic carboxylic acid having the general formula ##STR4## wherein R 6 is a substituent selected from the class consisting of hydrogen, halogen, cyano, alkyl, aryl aralkyl, alkaryl or cycloaliphatic groups.
Claim 5
Dependent Claim
14 words
A dispersion as claimed in claim 3 wherein the carboxylic acid is acrylic acid.
Claim 6
Dependent Claim
27 words
A dispersion as claimed in claim 1 wherein the said hydrophobic monomer is lauryl methacrylate, α-methyl-styrene, vinyl stearate, α-methyl-styrene macromer, a 1- or 2-naphthyl methacrylate, or vinylnaphthalene.
Claim 7
Dependent Claim
18 words
A dispersion as claimed in claim 1 wherein the organic particulate solid is an organic pigment or dye.
Claim 8
Dependent Claim
20 words
A dispersion as claimed in claim 6 wherein the dye is a reactive dye as defined in the Colour Index.
Claim 9
Dependent Claim
16 words
A dispersion as claimed in claim 1 wherein the aqueous medium comprises a concentrated electrolyte solution.
Claim 10
Dependent Claim
13 words
A dispersion as claimed in claim 8 wherein the electrolyte is sodium chloride.
Claim 11
Dependent Claim
50 words
A process for the production of a free-flowing powder which comprises an organic dye or pigment which process comprises at least the step of evaporating to dryness a dispersion of the organic pigment or dye in an aqueous medium containing as dispersing agent a copolymer as defined in claim 1.
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |