US4230858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perylene-3,4,9,10-tetracarboxylic acid diimide pigment, its manufacture and its use
Assignee: BASF SE
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Filing: 1978-07-28
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Granted: 1980-10-28
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Expires: 1998-07-28
Abstract
Abstract A new pigmentary form of perylene-3,4,9,10-tetracarboxylic acid diimide of the formula ##STR1## which has a specific surface area (measured by the BET method) of from 5 to 20 m 2 /g and a maximum in the particle size distribution at from 0.2 to 1μ in length and from 0.1 to 0.4μ in width, the mean ratio of length to width being from 4:1 to 1:1, and the proportion of particles between these size limits being at least 50% of the total distribution. The pure shade of the new pigmentary from gives strongly yellowish red colorations which are very pure and very bright. The new pigment also has a good hiding power, which is from 2 to 3 times as great as that of the pigments of the prior art.
Inventors
- 👤 Ludwig Gall
- 👤 Wolfgang Fabian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:15
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; C09D11/03; C09D11/037; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3437; C09B; C09B5/00; C09B5/62; C09B67/00; C09B67/0001; C09B67/0014
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
164 words
A perylene-3,4,9,10-tetracarboxylic acid diimide pigment of the formula ##STR4## which has a specific surface area, measured by the BET method, of from 5 to 20 m 2 /g, and is obtained by recrystallization by the steps of mixing crude perylene-3,4,9,10-tetracarboxylic acid bis-(2',5'-dimethylphenylimide) in the form of agglomerates of from 0.1 to 100 microns which consist of primary particles having a size of from 0.05 to 0.1 microns, in organic liquids selected from the group consisting of aliphatic ketones of 3 to 6 carbon atoms, ethylene glycol, diethylene glycol, ethylene glycol monoalkyl ethers, diethylene glycol monoalkyl ethers, where alkyl is of 1 to 4 carbon atoms, dioxane, tetrahydrofuran, propanol, n-butanol, isobutanol and benzene hydrocarbons, heating the mixture from 50° to 200° C., and maintaining the mixture at this temperature for a period from 7 to 20 hours to obtain a pigment which exhibits complete absorption at from 350 to 560 nm, followed by a sharp rise in reflectance up to a maximum at 650 nm.
Claim 2
Dependent Claim
164 words
A perylene-3,4,9,10-tetracarboxylic acid diimide pigment of the formula ##STR4## which has a specific surface area, measured by the BET method, of from 5 to 20 m 2 /g, and is obtained by recrystallization by the steps of mixing crude perylene-3,4,9,10-tetracarboxylic acid bis-(2',5'-dimethylphenylimide) in the form of agglomerates of from 0.1 to 100 microns which consist of primary particles having a size of from 0.05 to 0.1 microns, in organic liquids selected from the group consisting of aliphatic ketones of 3 to 6 carbon atoms, ethylene glycol, diethylene glycol, ethylene glycol monoalkyl ethers, diethylene glycol monoalkyl ethers, where alkyl is of 1 to 4 carbon atoms, dioxane, tetrahydrofuran, propanol, n-butanol, isobutanol and benzene hydrocarbons, heating the mixture from 50° to 200° C., and maintaining the mixture at this temperature for a period from 7 to 20 hours to obtain a pigment which exhibits complete absorption at from 350 to 560 nm, followed by a sharp rise in reflectance up to a maximum at 650 nm.
Claim 3
Dependent Claim
33 words
The pigment of claim 1 wherein the organic fluids used are n-butanol, isobutanol, ethylene glycol, diethylene glycol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, methyl ethyl ketone, diethyl ketone or mixtures thereof.
Claim 4
Dependent Claim
17 words
The pigment of claim 2 wherein the recrystallization is carried out at from 150° to 180° C.
References Cited (Backward Citations)
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US2905685A
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US2905686A
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US3022299A
Cited
FR1267372A
Cited
GB1202302A
Cited
US3772303A
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US3974136A
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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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |