Abstract:
A liquid preparation of a paper dye comprising a) 15 to 50% by weight of the dye of the formula CuPc[SO2NH(CH2)3N(CH3)2]2 to 3[SO3H]1 to 2 (1), in which CuPc represents copper phthalocyanine, or the alkali metal salt of (1), b) 5 to 15% by weight of ∈-caprolactam, c) 1 to 8% by weight of formic acid, d) 1 to 7% by weight of benzyl alcohol, e) 0 to 3% by weight of a lower aliphatic organic acid, f) 0 to 5% by weight of an inorganic salt and g) water, to complete to 100% by weight, a process for the production of said preparation and the use thereof for dyeing, in particular dyeing of paper.
Abstract:
Described is a process for preparing concentrated solutions or suspensions of anionic organic compounds which comprises a) acidifying an aqueous solution or suspension of an anionic organic compound containing salts and/or impurities to a pH of 4.5 or less, if the pH is above this value, so that b) the anionic organic compound is water-insoluble and precipitates in the form of the free acid, c) bringing the suspension to a salt content below 2% by weight, based on the total weight of the retentate, by means of ultrafiltration with a membrane having pore diameters of from 0.001 to 0.02 μm, and d) optionally washing out the salts with water having a pH below 4,5, e) optionally carrying out acid-free washing with water thereafter, and then f) concentrating, so that the amount of anionic organic compound is 5-50% by weight, and g) if desired, bringing the anionic organic compound into solution by adding an appropriate base.
Abstract:
Disclosed are dye mixtures for shading white paper which may contain fluorescent brightener. The dye mixtures comprise a violet dye according to the formula (1) or (2) indicated in claim 1 and sufficient of a red, blue or further violet anionic azo dye that this dye mixture is capable of producing in the Cielab color co-ordinates system a relative hue angle of 270 to 295° when the dyeing contains 0.00005 to 0.005% by weight of dye, based on the weight of the paper, with the proviso that the value 0.005% is excluded.
Abstract:
The present invention provides a composition, which comprises a latent activator. It also provides a process for the preparation of these compositions, substrates coated with these compositions and a process for their preparation, a process for preparing marked substrates using these compositions and marked substrates obtainable by the latter process.
Abstract:
Fiber products, comprising in their body at least 20% by weight of cellulose fibers, and adequate amounts of an acid and a cationic retention aid for the acid, can be marked by means of a laser beam.
Abstract:
The present invention relates to novel yellow anionic dyes, a process for their preparation, certain novel intermediates for their preparation and the use of these dyes for dyeing natural or synthetic materials, in particular, paper.
Abstract:
A process for the preparation of concentrated solutions or suspensions of anionic organic compounds is described, which process comprises a) acidifying an aqueous solution or dispersion of an anionic organic compound that comprises salts and/or impurities to a pH of 4.5 or less, if the pH is above that value, so that the anionic organic compound becomes insoluble in water and precipitates out in the form of the free acid, b) bringing the suspension obtained from the previous step to a salt content below 2% by weight, based on the total weight of retentate, by means of ultra-filtration with a ceramic membrane or an acid-resistant organic membrane having a pore size of from 1 to 20 nm, and c) optionally washing out of the salts with water at a pH of less than 4.5, d) optionally carrying out acid-free washing with water thereafter, and then e) concentrating so that the content of anionic organic compound is from 5 to 50 % by weight, and f) optionally bringing the anionic organic compound into solution by adding a suitable base.
Abstract:
Coating composition comprising a char forming compound as a first compound capable of forming a colored substance upon exposition to energy; at least one latent activator selected from the group consisting of ammonium phosphate, ammonium polyphosphate, ammonium sulfite, ammonium thiosulfate, ammonium sulfamate and ammonium sulfate; and a second compound capable of forming a colored substance upon exposition to energy selected from the group consisting of color formers, oxygen containing transition metal compounds, and metal-chelate-type color forming systems; a coating composition comprising a char forming compound as a first compound capable of forming a colored substance upon exposition to energy, and a second compound capable of forming a colored substance upon exposition to energy selected from the group consisting of color formers and metal-chelate-type color forming systems; a process for the preparation of these compositions, substrates coated with these compositions and a process for their preparation, a process for preparing marked substrates using these compositions and marked substrates obtainable by the latter process.
Abstract:
Fiber products, comprising in their body at least 20% by weight of cellulose fibers, and adequate amounts of an acid and a cationic retention aid for the acid, can be marked by means of a laser beam.
Abstract:
Coating composition comprising a char forming compound as a first compound capable of forming a coloured substance upon exposition to energy; at least one latent activator selected from the group consisting of ammonium phosphate, ammonium polyphosphate, ammonium sulfite, ammonium thiosulfate, ammonium sulfamate and ammonium sulfate; and a second compound capable of forming a coloured substance upon exposition to energy selected from the group consisting of colour formers, oxygen containing transition metal compounds, and metal-chelate-type colour forming systems; a coating composition comprising a char forming compound as a first compound capable of forming a coloured substance upon exposition to energy, and a second compound capable of forming a coloured substance upon exposition to energy selected from the group consisting of colour formers and metal-chelate-type colour forming systems; a process for the preparation of these compositions, substrates coated with these compositions and a process for their preparation, a process for preparing marked substrates using these compositions and marked substrates obtainable by the latter process.