摘要:
A process for the preparation of pigmentary forms of phthalocyanine and of insoluble polycyclic compounds, wherein the crude pigment is milled in the presence of one or more acids which have a pK of
摘要:
A method of producing a modified pigment by sulfonating a pigment and subsequently oxidizing the pigment. The modified pigment may have sulfonic acid and carboxyl surface modifying groups attached to the surface of the pigment. Charge balancing counterions such as alkali metals, alkaline earth metals and NR1R2R3H+, where R1, R2 and R3 are independently H or C1-C5 alkyl groups, may be associated with the surface modifying groups. The modified pigment is combined with water to produce a dispersion that can be used in such applications as coatings, paints, papers, adhesives, latexes, toners, textiles, fibers, plastics and inks.
摘要:
The invention relates to the use of polyacrylic acids which contain organic terminal groups containing sulphur, comprising at least two carbon atoms, having an average molecular weight Mw of 5 000-30 000 g/mol and which are at least partially neutralized by a base which is selected from the group of alkali hydroxides and ammonia as auxiliary agents for wet grinding of calcium carbonate. The invention also relates to fine particle aqueous suspensions of calcium carbonate which are produced by wet grinding of calcium carbonate in the presence of said polyacrylic acids.
摘要:
A mixture of an organic nanosize pigment comprising of from 50 to 99% by weight of the nanosize pigment and 1 to 50% by weight based of a low molecular weight naphthalene sulfonic acid formaldehyde polymer and its use as a particle growth and crystal phase director for the preparation of a direct pigmentary organic pigment or in pigment finishing.
摘要:
Colored substrate particles which are mainly used in metallic finish of automobiles, domestic electrical articles, tools and the like, decorative finish of plastics, printing ink and the like are disclosed herein. According to the present invention, adhesive property of a color pigment to substrate particles is improved by coating the surface of the color pigment with a specific surface-treatment agent. The colored substrate particles are preferably coated with a polymer polymerized by in situ polymerization, thereby the adhesion of the color pigment to the substrate particles can be further improved.
摘要:
This invention relates to pigment compositions prepared by precipitating a blend of (a) about 60 to about 95 percent by weight of a perylene pigment having the formula ##STR1## wherein R.sup.1 and R.sup.2 are independently C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.7 cycloalkyl, C.sub.7 -C.sub.16 aralkyl, or C.sub.6 -C.sub.10 aryl; and (b) about 5 to about 40 percent by weight of a polycyclic aromatic compound containg at least 5 aromatic rings wherein at least one ring is substituted with at least one keto group.
摘要:
A method of modifying a pigment which comprises dissolving the pigment into sulfuric acid and then mixing water with the pigment-sulfuric acid solution. The modified pigment is excellent in achieving uniform dispersion and has a small particle size. An electrophotographic photoreceptor containing the modified pigment as the organic photoconductor has uniform sensitivity, sufficient charge acceptance and small dark decay.
摘要:
Process for preparing 4,4'-diamino-1,1'-dianthraquinonyl pigments by desulphonation of 4,4'-diamino-1,1'-dianthraquinonyl-3,3'-disulphonic acid in sulphuric acid, characterized in that after the desulphonation water is added to the sulphuric acid solution, 4,4'-diamino 1,1'-dianthraquinonyl is isolated as sulphate, the sulphate is hydrolysed, if necessary by redissolving it in sulphuric acid and adding the solution to water, and the pigment is isolated, if necessary, after treatment with an organic solvent.
摘要:
Stable solutions of azo dyes obtained by diazotizing and coupling m-phenylenediamine or derivatives thereof are prepared after the reaction has ended by treating the resulting reaction mixture with from 0.1 to 1.2 moles of formic acid, based on 1 mole of m-phenylenediamine, at from 60.degree. C. to the boiling point of the reaction mixture.