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5223624 Modified gamma-quinacridone pigment  
A new gamma quinacridone polytype having a yellowish-red color and a distinct X-ray diffraction pattern, said new form being prepared directly in high yield in pigmentary form by oxidation of...
5207829 Pigment preparations  
Pigment preparations whose pigment portion is composed essentially of organic pigments and of pigment additives of the formula I ##STR1## in which P is a radical of an organic pigment and X in the...
5194088 Process for conditioning organic pigments  
A process for converting crude pigments into pigmentary form wherein the crude pigment is premilled, then contacted with a polar solvent at temperatures below 50° C., with or without the presence...
5190586 Pigment composite particles prepared by suspension polymorization  
Disclosed are pigment composite particles which are superior in water resistance, weather resistance, thermal stability and hardness. The pigment composite particles are prepared by...
5145524 Surface modified pigment compositions  
Surface modification of a variety of pigments, particularly quinacridone pigments, and the pigments resulting therefrom whereby the pigment is treated with a poly(vinyl lower alkyl ether) and,...
5137576 Quinacridones having selectively adjusted triboelectric effects  
Quinacridones having selectively adjusted triboelectric effects, which quinacridones contain about 0.05% to 100 percent by weight of triboelectrically active compounds of the general formula I ...
5112404 Pigment formulations, processes for their preparation and their use  
The invention relates to readily dispersible pigment formulations which are stable to flocculation and are used for pigmenting naturally occurring and synthetic materials, preferably paints and...
5108509 Flushed pigment and a method for making the same  
A pigment is formed in an aqueous slurry. A mixture of the pigmented slurry and a vehicle is subjected to high speed, high shear mixing action. The water is forced out of the solid pigment and...
5084100 Quinacridone dispersion milling process  
A dispersion milling process for reducing the particle size of quinacridone pigments wherein the quinacridone is milled in the presence of hydrated aluminum sulfate and, as a crystallizing solvent,...
5084573 2,9-dichloroquinacridone in platelet form  
2,9-Dichloroquinacridone in platelet form having a length of 1-45 μm, a width of 0.1-20 μm and a thickness of 0.05-5 μm; a process for the preparation thereof comprising conversion of the crude...
5082498 Highly concentrated solid pigment formulations  
Solid pigment formulations containing from 70 to 97% by weight, based on the total weight of the formulation, of one or more pigments and also from 3 to 30% by weight, based on the total weight of...
5069719 Organic solvent based ink composition  
Disclosed is an organic solvent based ink composition which contains a specific dye and an organic solvent, especially an alcohol or a glycol and which has excellent stability with time and good...
4986852 Pigments and use thereof  
Pigments of the formula I ##STR1## where A is a five- or six-membered aromatic fused or unfused heterocycle which contains one to three hetero atoms from the series consisting of nitrogen and/or...
4970248 Gamma modification of an azine pigment  
Azine pigment which has one of the possible tautomeric forms of the formula I ##STR1## and which is present in its c-crystalline modification, which is characterized by the interplanar spacings...
4881980 Pigments of the quinacridonequinone series, processes for their preparation and their use  
Pigments of the quinacridonequinone series consisting of 98-20 mol percent of a quinacridonequinone of the general formula (1) ##STR1## in which R denotes a hydrogen or chlorine atom or a methyl or...
4872916 Phosphate ester pigment dispersant  
An aqueous pigment dispersion containing as the dispersing agent a phosphate ester salt having the general formula: ##STR1## wherein: R and R' are the same or different linear or branched alkyl...
4857646 Modified beta-quinacridone pigment  
A new beta quinacridone polytype having a magenta color and a distinct X-ray diffraction pattern, said new form preferably having an average particle size of about 0.2-0.8 μm and being prepared by...
4844742 Surface modified pigment compositions  
Surface modification of a variety of pigments, particularly quinacridone pigments, and the pigments resulting therefrom whereby the pigment is treated with a solvent-free, basic,...
H000564 Pigment milling process  
Aqueous pigment concentrates are produced by a two-step milling process. The process comprises a. pumping a crude with from about 12% to about 48% by weight of surfactant, based on pigment, and...
4777105 Magenta colorant for electrophotographic recording processes  
An improved magenta colorant for electrophotographic multicolor recording processes, comprising mix-crystals from 95 to 60 parts of a compound of the formula I below and 5 to 40 parts of a compound...
4762569 Easily dispersible pigment composition and dispersing method  
The present invention relates to a easily dispersible pigment composition for non-aqueous vehicles, comprising 100 wt. parts of organic pigment or inorganic pigment and 0.5-15 wt. parts of...
4760144 Process for preparation of yellow shade modification of gamma quinacridone  
Process for preparing yellow shade modification of gamma quinacridone whereby the γ II form is converted to the γ I form (1) by milling in an alcohol and in the presence of a base or (2) by...
4760004 Thioquinacridones and isothioquinacridones, preparation and use thereof  
Compounds of the formulae I, II and III ##STR1## in which R is --F, --Cl, --Br, C 1 -C 18 alkoxy, and n is the number 0, 1, 2 or 3, are suitable in particular for use as photoconductive substances.
4758665 Process for preparing high-hiding gamma-modification of unsubstituted linear transquinacridone  
A process for preparing the high-hiding form of the γ-crystal modification of unsubstituted linear transquinacridone having improved tinctorial strength and producing a coating of higher gloss,...
4734137 Process for preparation of organic pigments  
Organic pigments are prepared by dissolving at least one organic pigment in a non-protonic polar solvent in the presence of a caustic alkali and water, and adding to the solution an acid having an...
4732618 Powdered pigments with improved rheological properties, processes for their preparation and their use with a content of at least 5% of unsubstituted quinacridone  
Powdered pigments which contain at least 5% of unsubstituted quinacridone and have improved rheological properties for use in paint systems on an alkyd/melamine, acrylic/melamine,...
4684408 Silanated quinacridone dyes and composite pigments  
Silane quinacridone dyes, composite pigments obtainable therefrom by association with an inorganic substrate, and the processes for preparing them. The dyes have the general formula: ##STR1##...
4655845 Process for preparing organic pigments having excellent application properties  
Process for preparing organic pigments having excellent application properties, which comprises treating finely divided crude pigments of the anthanthrone, pyranthrone, isoviolanthrone, azo,...
4632704 Process for the preparation of high yield pigments  
A process for the preparation of high yield pigments of the series of the diketopyrrolopyrroles, quinacridones, isoindolinones and isoindolines by protolysis of the pigment salt obtained by...
4601759 Pigment compositions, method for producing same, and colored resin compositions  
The present invention relates to pigment compositions which comprise a wet cake of a pigment whose moisture content is reduced to a range from 2 to 19 wt % while keeping the pigment in the wet cake...
4491481 Organic pigment compositions containing an azo compound with a heterocyclic substituent  
A pigment composition comprising (a) an organic pigment and (b) from 0.5% to 20% by weight, based on the weight of organic pigment, of a pigment derivative having the formula: A--[NN--B]...
4478643 Base composition comprising an irradiated organic pigment  
A pigment-containing base composition comprising at least one organic pigment irradiated with low-temperature plasma and at least one polar resin or solvent, which has good dispersibility.
4469523 Borax dispersion milling of quinacridones  
A process of reducing the particle size of oversize crude quinacridones to pigmentary grade material by ball or rod milling the crude quinacridone with 3-10 parts per part by weight pigment of...
4455173 Preparation of pigmentary form of quinacridone pigments  
Pigmentary grade quinacridone pigments are prepared from crude quinacridone by conversion to aggregated low crystallinity quinacridones followed by milling the aggregated low crystallinity...
4451654 Conditioning of finely divided crude organic pigments  
A process for the preparation of deeply colored organic pigments by crystallizing finely divided crude organic pigments, whose primary particles have a size of ≤0.2 μm, in C 3 -C 5 -alkanes, C...
4439240 Aqueous milling of quinacridone pigment  
Pigmentary grade quinacridone pigments are prepared from crude quinacridone by dry milling the crude quinacridone to form aggregated low crystallinity material followed by milling the low...
4426231 Light stable quinacridonequinone pigments  
Quinacridonequinone pigments photostabilized with from 2.5 to 20 wt. % Mn(OH) 2 are disclosed. The Mn(OH) 2 is precipitated on the pigment from an aqueous solution of a divalent manganese salt by...
4400515 Quinacridone mixtures, process for their manufacture and their use as pigments  
Compositions of linear trans-quinacridones containing at least one component (I) selected from unsubstituted, chloro- and methyl-substituted quinacridone and at least one component (II) selected...
4371643 Particle size reduction of pigments by non-salt milling  
Pigment compositions prepared from a pigment, a hydroxylic solvent, and a polar polymer may be reduced in particle size by grinding in the absence of a salt to produce a pigment which may be used...
4317682 Pigment compositions and use thereof  
There is provided a pigment composition comprising 100 parts by weight of a pigment and from 0.3 to 30 parts by weight of a colorless or slightly colored aromatic compound having the following...
4298398 Process for converting premilled crude quinacridone to pigmentary form  
Process for converting premilled quinacridone to pigmentary form by contacting the premilled quinacridone with aqueous alkaline medium in the presence of a quaternary ammonium compound.
4286998 Light stable quinacridonequinone yellow pigment  
A solid solution of a quinacridonequinone with a stabilizer selected from the group consisting of 2-anilinoacridone, 5,6,7,8-tetrahydro-2-anilinoacridone, 6-anilinoquinolone and 2-aminoacridone of...
4277288 Fluidized granulation of pigments using organic granulating assistant  
A process for producing a substantially dry, low dusting, free flowing granular pigment composition comprises (a) contacting a fluidized bed of pigment and a granulating assistant, (b) optionally...
4272298 Process for conditioning a pigment in liquid ammonia  
A process for conditioning a pigment or disperse dye which comprises treating the colorant with liquid ammonia and results in an improvement of the dyeing properties and may be accompanied by a...
4260424 Method for preparing a pigment composition  
A method for preparing a resinous pigment composition is disclosed which method includes charging pigment, water and water-insoluble resin which is solid at room temperature into a mill containing...
4247696 Process for preparing gamma phase quinacridone  
Finely divided gamma crystal phase quinacridone pigments are prepared by a process wherein a crude quinacridone of an arbitrary crystal phase is dissolved in dimethyl sulfoxide in the presence of a...
4247695 Process for preparation of quinacridone pigments using moderately concentrated acid  
A process for preparing beta or gamma crystals of linear quinacridone, substituted quinacridone or solid solutions thereof by contacting premilled quinacridone with 45-60% by weight sulfuric acid...
4212975 Process for the manufacture of the gamma-crystal modification of linear trans-quinacridone  
Unsubstituted linear trans-quinacridone of the gamma-crystal modification is obtained by cyclization of 2,5-dianilino-terephthalic acid with the 2.5 to 4-fold quantity of polyphosphoric acid or of...
4197404 Preparation of γ-quinacridone pigment  
In a process for preparing pigmentary γ-quinacridone by oxidizing β-dihydroquinacridone with a mild alkali-stable oxidizing agent in a liquid medium consisting of alkali metal hydroxide, water...
4196016 Grinding of pigments  
A method of salt grinding pigments wherein the material to be ground is milled with an inorganic salt, an organic conditioner, and larger particles such as balls or nails for comminuting the...
Matches 201 - 250 out of 322 < 1 2 3 4 5 6 7 >