US5776238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pigments
Assignee: BASF Corp
•
Filing: 1996-12-16
•
Granted: 1998-07-07
•
Expires: 2016-12-16
Abstract
Abstract The present invention provides a process for converting a crude pigment into pigmentary form which comprises kneading the crude pigment in the presence of a liquid carboxylic acid and optionally a salt.
Inventors
- 👤 Paul Kerwin
- 👤 Robert Langley
- 👤 Arthur Stark Walls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:12
CPC Classifications
C; C09; C09C; C09C3/00; C09B; C09B67/00; C09B67/0001; C09B67/0017
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
A process for converting a crude non-pigmentary form of an organic pigment into pigmentary form which comprises a) kneading the crude non-pigmentary form of an organic pigment in the presence of a liquid carboxylic acid having 6 to 20 carbon atoms and optionally an inorganic or organic salt, and b) separating the pigment produced from step (a) from the liquid carboxylic acid and optional inorganic or organic salt.
Claim 2
Dependent Claim
68 words
A process for converting a crude non-pigmentary form of an organic pigment into pigmentary form which comprises a) kneading the crude non-pigmentary form of an organic pigment in the presence of a liquid carboxylic acid having 6 to 20 carbon atoms and optionally an inorganic or organic salt, and b) separating the pigment produced from step (a) from the liquid carboxylic acid and optional inorganic or organic salt.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 in which the carboxylic acid is 2-ethyl hexanoic acid, oleic acid, caproic acid, valeric acid or enanthic acid.
Claim 4
Dependent Claim
27 words
A process as claimed in claim 1 which is carried out at a temperature from 20° C. up to the a temperature at which the acid boils.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1 which is carried out at a temperature from 80° C. to 120° C.
Claim 6
Dependent Claim
19 words
A process as claimed in claim 1 in which the kneader is a batch kneader or a continuous kneader.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 5 in which a twin screw extruder is used.
Claim 8
Dependent Claim
27 words
A process as claimed in claim 1 in which the acid is introduced into a screw kneader through one inlet at the beginning of the screw kneader.
Claim 9
Dependent Claim
18 words
A process as claimed in claim 1 in which the acid is recovered after use and is recycled.
Claim 10
Dependent Claim
29 words
A process as claimed in claim 1 in which a salt is present and the amount of salt is 0.1 to 20 parts by weight per part of pigment.
Claim 11
Dependent Claim
28 words
A process as claimed in claim 1 in which the pigment is a phthalocyanine, a partially halogenated phthalocyanine, a quinacridone, a dioxazine, a diketopyrrolo pyrrole or a perylene.
Claim 12
Dependent Claim
23 words
A process as claimed in claim 1 in which the pigment is treated with a conventional pigment additive during or after the kneading.
Claim 13
Dependent Claim
26 words
A process as claimed in claim 11 in which the pigment is phthalocyanine and the pigment additive is an amine salt of a phthalocyanine sulphonic acid.
References Cited (Backward Citations)
GB710229A
Cited
GB844405A
Cited
US3510331A
Cited
US3617323A
Cited
US4167420A
Cited
GB2042576A
Cited
US5472490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |