US4250079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of a perylene-3,4,9,10-tetracarboxylic dianhydride pigment with improved properties
Assignee: BASF Corp
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Filing: 1979-05-10
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Granted: 1981-02-10
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Expires: 1999-05-10
Abstract
Abstract A process for the manufacture of perylenetetracarboxylic dianhydride pigments having improved dispersibility, which comprises adding at least one primary aliphatic or cycloaliphatic amine containing at least 12 carbon atoms to an aqueous alkaline solution of an alkali metal salt or ammonium salt of perylenetetracarboxylic acid, acidifying the reaction mixture, whereupon the free perylenetetracarboxylic acid precipitates and is then converted by heating the reaction mixture into the dianhydride, which is isolated in the conventional manner.
Inventors
- 👤 Fridolin Babler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:19
CPC Classifications
C; C09; C09B; C09B5/00; C09B3/00; C09B3/14; C09B67/00; C09B67/0001; C09B67/002
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
A process for the manufacture of a modified perylenetetracarboxylic acid pigment composition, having extremely good dispersibility and a small portion of imide groups present in the pigment, which process comprises (a) adding 0.01 to 0.2 moles of at least one primary aliphatic or cycloaliphatic amine having at least 12 carbon atoms, per each mole of perylenetetracarboxylic acid to an aqueous alkaline solution of an alkali metal salt or ammonium salt of perylenetetracarboxylic acid, (b) acidifying the reaction mixture to precipitate free perylenetetracarboxylic acid at a temperature between 0° and 100° C., (c) heating the reaction mixture to reflux to convert the acid to the corresponding anhydride, and (d) isolating the pigment composition.
Claim 2
Dependent Claim
112 words
A process for the manufacture of a modified perylenetetracarboxylic acid pigment composition, having extremely good dispersibility and a small portion of imide groups present in the pigment, which process comprises (a) adding 0.01 to 0.2 moles of at least one primary aliphatic or cycloaliphatic amine having at least 12 carbon atoms, per each mole of perylenetetracarboxylic acid to an aqueous alkaline solution of an alkali metal salt or ammonium salt of perylenetetracarboxylic acid, (b) acidifying the reaction mixture to precipitate free perylenetetracarboxylic acid at a temperature between 0° and 100° C., (c) heating the reaction mixture to reflux to convert the acid to the corresponding anhydride, and (d) isolating the pigment composition.
Claim 3
Dependent Claim
20 words
A process for pigmenting plastics which comprises incorporating therein an effective amount of a pigment composition according to claim 1.
Claim 4
Dependent Claim
24 words
A pigmented composition which comprises (a) a high molecular weight polymer; and (b) an effective amount of a pigment composition according to claim 1.
Claim 5
Dependent Claim
14 words
A process according to claim 1 which comprises adding stearylamine as primary aliphatic amine.
Claim 6
Dependent Claim
20 words
A process according to claim 1 which comprises adding 0.03 to 0.08 mole of amine, per each mole of pigment.
Claim 7
Dependent Claim
18 words
A process according to claim 1, wherein a solution of the amine in an organic solvent is added.
Claim 8
Dependent Claim
25 words
A process according to claim 6, wherein the organic solvent is an alcohol or mixture of monovalent aliphatic alcohols containing 1 to 4 carbon atoms.
Claim 9
Dependent Claim
20 words
A process according to claim 6 which comprises adding 1 to 4 parts of solvent per 1 part of pigment.
Claim 10
Dependent Claim
21 words
A process according to claim 1, wherein the treatment with amine is carried out in the presence of a texture improver.
Claim 11
Dependent Claim
26 words
A process according to claim 9, wherein the texture improver is a fatty acid containing at least 18 carbon atoms, or a salt or amide thereof.
Claim 12
Dependent Claim
21 words
A process according to claim 9 which comprises adding 0.02 to 0.2 mole of texture improver, per each mole of pigment.
Claim 13
Dependent Claim
28 words
A process according to claim 9 which comprises adding 0.03 to 0.08 mole of amine and 0.02 to 0.1 mole of texture improver, per each mole of pigment.
Claim 14
Dependent Claim
10 words
The modified perylenetetracarboxylic dianhydride pigments obtained according to 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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |