Isometric isoindoline yellow pigment

Details Isometric isoindoline yellow pigment Isometric isoindoline yellow pigment

2008-12-08

2011-12-13

Green, Anthony (Department: 1731)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C524S101000, C544S284000, C544S300000

Reexamination Certificate

active

08075683

ABSTRACT:
Pigment of formula wherein R1is CONR4R5or C(═NR6)NR7R8, R2, R3, R4and R5are each independently of the others H, C1-C5alkyl, or phenyl which is unsubstituted or substituted from 1 to 5 times by C1-C5alkyl or by halogen, R6is phenyl which is unsubstituted or substituted from 1 to 4 times by C1-C5alkyl or by halogen, R7is H or C1-C5alkyl, and R8is a direct bond or a carbonyl bridge to R6, which pigment consists of primary particles the average aspect ratio of which is from 4 to 1, preferably from 3.5 to 1, especially from 3 to 1, and for 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 (formula), wherein a is the semimajor axis and b is the semiminor axis of the equivalent ellipse. That pigment preferably has a narrow particle size distribution and is, as are analogous pigments, prepared by a novel process. The invention relates also to a process for the preparation of that pigment, wherein R1CH2CN or (formula) is dispersed in an acidic aqueous medium containing from 70 to 99% by weight water, preferably in the presence of a dispersant, and is reacted with solid (formula).preferablyɛ=a2-b2a

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