Abstract Phthalocyanine pigment intended for the colouration of printing ink in which the elementary particles are coated with a film of a phthalocyanine derivative which is soluble in organic solvents that are miscible with water and which is a compound of the formula: Pc -X-Rm (I) in which R represents an alkyl group having 8 to 18 carbon atoms, Pc represents the residue of a metalliferous or nonmetallised phthalocyanine, X represents a divalent group SO2NH-(CH2)n-NH-, -CH2NH-(CH2)n-NH-(wherein n represents 2 or 3), -SO2-O-aryl, -Ch2-aryl-, and m represents a number from 2 to 4; and process for the preparation of such pigments comprising dispersing a phthalocyanine pigment in a solution of an organosoluble phthalocyanine of formula I above in an organic solvent that is miscible in water and precipitating the organosoluble phthalocyanine on the pigment in suspension by the addition of water; and inks containing such pigment.
PHTHALOCYANINE PIGMENT COMPOSITION INTENDED FOR THE COLOURATION OF PRINTING INK IN WHICH THE ELEMENTARY PARTICLES OF PHTHALOCYANINE PIGMENTS ARE COATED WITH A FILM OF A PHTHALOCTANINE DERIVATIVE WHICH IS INSOLUBLE IN WATER BUT SOLUBLE IN ORGANIC SOLVENTS THAT ARE MISCIBLE WITH WATER AND WHICH IS A COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
50 words
PHTHALOCYANINE PIGMENT COMPOSITION INTENDED FOR THE COLOURATION OF PRINTING INK IN WHICH THE ELEMENTARY PARTICLES OF PHTHALOCYANINE PIGMENTS ARE COATED WITH A FILM OF A PHTHALOCTANINE DERIVATIVE WHICH IS INSOLUBLE IN WATER BUT SOLUBLE IN ORGANIC SOLVENTS THAT ARE MISCIBLE WITH WATER AND WHICH IS A COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
41 words
Pigment composition according to claim 1 wherein the aryl group is benzene or naphthalene either unsubstituted or substituted by up to three alkyl, alkoxy or alkoxycarbonyl groups or halogen atoms, the alkyl and alkoxy groups containing up to 12 carbon atoms.
Claim 4
Dependent Claim
23 words
Pigment composition according to claim 1 wherein there are 1 to 30 parts of the phthalocyanine derivative per 100 parts of phthalocyanine pigment.
Claim 5
Dependent Claim
23 words
Pigment composition according to claim 3 wherein there are 15 to 25 parts of the phthalocyanine derivative per 100 parts of phthalocyanine pigment.
Claim 6
Dependent Claim
97 words
Process for the preparation of the phthalocyanine pigment composition according to claim 1 comprising the steps of firstly making a suspension of the phthalocyanine pigment in a solution of the water insoluble phthalocyanine derivative of formula I of claim 1, in an organic solvent that is miscible in water, wherein the ratio of the amount of the phthalocyanine derivative used to the phthalocyanine pigment used is from 1 to 30 percent and wherein the suspension is made by stirring action at ambient room temperature, and then precipitating the phthalocyanine pigment in suspension by the addition of water.