Patent US4170487A successfully refreshed from Google Patents.
US4170487A
Expired / Lapsed
US
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Process for granulating pigment compositions
Assignee: BASF Corp
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Filing: 1978-03-24
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Granted: 1979-10-09
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Expires: 1998-03-24
Abstract
Abstract A process for producing a pigment or dyestuff composition in the form of dustless readily-dispersible granules which comprises contacting, with agitation, an aqueous dispersion of a pigment, a protective colloid, an aliphatic or araliphatic amine which is liquid at temperatures below 100° C., insoluble in water at pH values above 7, and soluble in water at pH values below 7, and an organic carrier, the pH value being first above 7, maintaining the temperature above the melting point of the amine compound, and reducing the pH to below 7 to render the amine compound soluble in water, and recovering the resulting granules.
Inventors
- 👤 George H. Robertson
- 👤 Robert L. Rooney
- 👤 Robert B. Todd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:32
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0092; C09B67/0095
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
173 words
A process for producing a pigment or dyestuff composition in the form of dustless readily-dispersible granules which comprises contacting, with agitation, (1) an aqueous dispersion of a pigment, (2) a protective colloid, (3) an aliphatic or araliphatic amine which is liquid at temperatures below 100° C., insoluble in water at pH values above 7, and soluble in water at pH values below 7, and (4) an organic carrier which has a melting point above 40° C. and which is soluble in, or at least softened by the amine and is insoluble or can be rendered insoluble in water throughout the pH range used in the process, the pH value being first above 7, maintaining the temperature above the melting point of the amine compound, stirring at least until the pigment has migrated from the aqueous phase to the organic phase consisting of the protective colloid and the amine, and then reducing the pH to below 7 to render the amine compound soluble in water, and recovering the resulting granules in a solvent-free condition.
Claim 2
Dependent Claim
173 words
A process for producing a pigment or dyestuff composition in the form of dustless readily-dispersible granules which comprises contacting, with agitation, (1) an aqueous dispersion of a pigment, (2) a protective colloid, (3) an aliphatic or araliphatic amine which is liquid at temperatures below 100° C., insoluble in water at pH values above 7, and soluble in water at pH values below 7, and (4) an organic carrier which has a melting point above 40° C. and which is soluble in, or at least softened by the amine and is insoluble or can be rendered insoluble in water throughout the pH range used in the process, the pH value being first above 7, maintaining the temperature above the melting point of the amine compound, stirring at least until the pigment has migrated from the aqueous phase to the organic phase consisting of the protective colloid and the amine, and then reducing the pH to below 7 to render the amine compound soluble in water, and recovering the resulting granules in a solvent-free condition.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1, in which the amine is a C 6 -C 12 linear, branched alkyl or cycloalkyl amine.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 1, in which the amount of amine is from 0.1 to 2 parts by weight per part of pigment.
Claim 5
Dependent Claim
25 words
A process as claimed in claim 1, in which the amount of amine is from 0.3 to 0.6 parts by weight per part of pigment.
Claim 6
Dependent Claim
58 words
A process as claimed in claim 1, in which the carrier is a carboxylic acid ester, a carboxylic acid amide, a phosphate ester, a resin, a vinyl polymer, a styrene polymer, a polyolefin, a fatty alcohol, a fatty amine which does not give water soluble salts, a fatty oxazoline, a water insoluble carboxylic acid or a rosin derivative.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 1, in which the amount of carrier is from 0.05 to 2 parts by weight per part of pigment.
Claim 8
Dependent Claim
25 words
A process as claimed in claim 6, in which the amount of carrier is from 0.1 to 0.7 parts by weight per part of pigment.
Claim 9
Dependent Claim
36 words
A process as claimed in claim 1, in which the protective colloid is mixed with an aqueous pigment slurry or an aqueous dispersion of the amine before the pigment or dyestuff and amine are brought together.
Claim 10
Dependent Claim
16 words
A process as claimed in claim 1, in which the protective colloid is a cellulose derivative.
Claim 11
Dependent Claim
25 words
A process as claimed in claim 1, in which the amount of protective colloid is up to 15% by weight of the pigment or dyestuff.
Claim 12
Dependent Claim
23 words
A process as claimed in claim 10, in which the amount of protective colloid is less than 5% by weight of the pigment.
Claim 13
Dependent Claim
23 words
A process as claimed in claim 1, which is carried out at a temperature at which the carrier is dissolved in the amine.
Claim 14
Dependent Claim
27 words
A process as claimed in claim 1, in which the stirring is such as will produce granules of a size from 0.1 to 5 mm. in diameter.
Claim 15
Dependent Claim
27 words
A process as claimed in claim 1, in which the stirring is such as will produce granules of a size from 0.5 to 2 mm. in diameter.
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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |