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1. US20110023754 - Isometric isoindoline yellow pigment

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1. A pigment of formula

( MOL) ( CDX)
wherein R 1 is CONR 4R 5 or C(═NR 6)NR 7R 8,
R 2, R 3, R 4 and R 5 are each independently of the others H, C 1-C 5alkyl, or phenyl which is unsubstituted or substituted from 1 to 5 times by C 1-C 5alkyl or by halogen,
R 6 is phenyl which is unsubstituted or substituted from 1 to 4 times by C 1-C 5alkyl or by halogen, R 7 is H or C 1-C 5alkyl, and
R 8 is a direct bond or a carbonyl bridge to R 6,
which pigment consists of primary particles the average aspect ratio of which is from 4 to 1, and/or the ellipses equivalent to the contours of the primary particles on a two-dimensional electron microscopic image have an average numerical eccentricity ε of from 0 to 0.80, the numerical eccentricity ε being defined as
( NB)
wherein a is the semimajor axis and b is the semiminor axis of the equivalent ellipse.
2. A pigment according to claim 1, containing ≧90% by weight particles≦0.50 μm and ≧50% by weight particles≦0.40 μm.
3. A pigment according to claim 1, containing ≧80% by weight particles≦0.45 μm and ≧60% by weight particles≦0.40 μm.
4. A pigment according to claim 2, wherein the ratio of the proportion by weight of primary particles of size D max to the proportion by weight of primary particles of size 0.55 μm is ≧10.
5. A pigment according to claim 2, wherein the ratio of the proportion by weight of primary particles of size D max to the proportion by weight of primary particles of size D max+0.170 μm is ≧6.
6. A pigment according to claim 2, wherein
≧60% by weight of the primary particles are in the range D max±75 nm, wherein D max denotes the particle size which corresponds to the maximum of the particle size distribution by weight; and/or
the fraction of medium primary particle size, excluding 16% by weight fines fraction and 16% by weight coarse fraction, has a spread of ≦130 nm,
the fraction of medium primary particle size, excluding 16% by weight fines fraction and 16% by weight coarse fraction, has a spread of ≦122 nm.
7. A pigment according to claim 1, which consists of primary particles the average aspect ratio of which is from 3.5 to 1, and the ellipses equivalent to the contours of the primary particles on a two-dimensional electron microscopic image have an average numerical eccentricity ε of from 0.05 to 0.80, with
( NB)
wherein a is the semimajor axis and b is the semiminor axis of the equivalent ellipses.
8. A process for the preparation of a pigment of formula

( MOL) ( CDX)
wherein R 1 is CONR 4R 5 or C(═NR 6)NR 7R 8,
R 2, R 3, R 4 and R 5 are each independently of the others H, C 1-C 5alkyl, or phenyl which is unsubstituted or substituted from 1 to 5 times by C 1-C 5alkyl or by halogen,
R 6 is phenyl which is unsubstituted or substituted from 1 to 4 times by C 1-C 5alkyl or by halogen, R 7 is H or C 1-C 5alkyl, and
R 8 is a direct bond or a carbonyl bridge to R 6,
wherein R 1CH 2CN or

( MOL) ( CDX)
is dispersed in an acidic aqueous medium containing from 70 to 99% by weight water, optionally in the presence of a dispersant, and is reacted with solid

( MOL) ( CDX)
9. A process according to claim 8, wherein the pH value is in the range of from 2.5 to 6.5.
10. A process according to claim 8, wherein the acidic aqueous medium contains an organic acid having a water-solubility of at least 5 g per litre of water, the dispersant is a polyfunctional compound having a molecular weight>320 Da, and the reaction medium contains from 0 to 10% by weight neutral organic substances.
11. A process according to claim 8, wherein the dispersant comprises aromatic sulfonic groups and alkali and alkaline earth salts thereof and is obtained by condensation of aromatic compounds with formaldehyde.
12. A process according to claim 8, wherein the fully reacted reaction mixture containing the pigment is heated to a temperature of from 40 to 200° C., optionally under pressure.
13. A process according to claim 12, wherein before or during the after-treatment the composition of the reaction mixture is changed within the limits indicated for the reaction or by addition of up to 200% by weight of neutral organic substances, based on the amount of water.
14. Amass-coloured high molecular weight material containing from 0.01 to 70% by weight, based on the total coloured high molecular weight material, of a pigment according to claim 1.
15. A method of mass-colouring a high molecular weight material comprising the step of mixing of the pigment according to claim 1 to the high molecular weight material.
16. The pigment according to claim 1, wherein pigment is a compound of formula

( MOL) ( CDX)
17. The process according to claim 8, wherein the pigment prepared is a compound of formula

( MOL) ( CDX)