US4115386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perylene-3,4,9,10-tetracarboxylic acid diimide pigment, its manufacture and its use
Assignee: BASF SE
•
Filing: 1976-09-22
•
Granted: 1978-09-19
•
Expires: 1996-09-22
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 10 to 35 m 2 /g and a maximum in the particle size distribution at from 0.1 to 0.5 μm, the proportion of particles between these sizes being at least 50% of the total distribution and the mean ratio of length to width being from 3:1 to 1:1. The pure shade of the new pigmentary form gives strongly yellowish red colorations which are very pure and very bright. The new pigmentary form also has a good hiding power, which is from 2 to 3 times as great as that of the pigmentary forms of the prior art.
Inventors
- 👤 Ludwig Gall
- 👤 Wolfgang Fabian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:15
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: 3
Claim 1
Independent Claim
81 words
A particulate 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 10 to 35 m 2 /g and particle length distribution range in which a maximum value is reached at from about 0.1 to 0.5 μm, the proportion of particles between these limits being at least about 50% of the total distribution, and the mean ratio of length to width of the particles is from about 3:1 to 1:1.
Claim 2
Dependent Claim
81 words
A particulate 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 10 to 35 m 2 /g and particle length distribution range in which a maximum value is reached at from about 0.1 to 0.5 μm, the proportion of particles between these limits being at least about 50% of the total distribution, and the mean ratio of length to width of the particles is from about 3:1 to 1:1.
Claim 3
Dependent Claim
27 words
A perylenetetracarboxylic acid diimide pigment as claimed in claim 1, wherein the mean ratio of length to width of the pigment particles is from 2:1 to 1:1.
References Cited (Backward Citations)
US2905685A
Cited
US2905686A
Cited
DE1113773B
Cited
US3006882A
Cited
US3022299A
Cited
GB1202302A
Cited
US3772303A
Cited
US3974136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |