Clariant Corporation reveals basic bisazo compounds measured in nanometers, their production, their use as dyestuffs as well as material dyed with these dyestuffs in U.S. Patent Application 20100000033.
Paper dyeings or printings made with nanoparticle basic bisazo compounds formulated by Clariant Corporation (Charlotte, NC) are clear and brilliant and have good light fastness. On exposure to light for a long time, the shade of the dyeing fades tone in tone.
The nanoparticle dyes show very good wet fastness properties; being fast to water, milk, fruit juice, sweetened mineral water, tonic water, soap and sodium chloride solution, urine etc. Furthermore, they have good alcohol fastness properties. The wet fastness properties are improved compared to known dyes showing otherwise similar properties. They do not exhibit a tendency towards two-sidedness, according to German and Swiss inventors Ludwig Hasemann, Friedrich Lehr, Martin Oberholzer and Heidrun Schene.
Paper dyed or printed with the nanoparticle diamines or bisazo compounds can be bleached either oxidatively or reductively, a feature, which is important for the recycling of waste paper and old paper products.
The compounds may also be used to dye paper containing wood-pulp where even dyeings, having good fastness properties are obtained. Furthermore, they may be used for the production of coated paper in accordance with known methods. Preferably when coating, a suitable filler, for example kaolin, is employed in order to give a one-side coated paper.
The compounds are also suitable for dyeing in combination with other dyes for example other cationic or anionic dyes. The compatibility of the compounds when used as a dye in mixtures with other commercially available dyes, may be determined according to conventional methods. The thus obtained dyeings have good fastness properties.
The dye preparations can also be used for dyeing and tinting wood. The wood can be in the form of articles, such as bowls, dishes, toys, but also solid slats and beams, and also in the form of shavings, chips or chipboard. Parts of buildings can similarly be treated with the dye preparations of the present invention, as can furniture.
Paper dyed or printed with the nanoparticle diamines or bisazo compounds can be bleached either oxidatively or reductively, a feature, which is important for the recycling of waste paper and old paper products.
The compounds may also be used to dye paper containing wood-pulp where even dyeings, having good fastness properties are obtained. Furthermore, they may be used for the production of coated paper in accordance with known methods. Preferably when coating, a suitable filler, for example kaolin, is employed in order to give a one-side coated paper.
The compounds are also suitable for dyeing in combination with other dyes for example other cationic or anionic dyes. The compatibility of the compounds when used as a dye in mixtures with other commercially available dyes, may be determined according to conventional methods. The thus obtained dyeings have good fastness properties.
The dye preparations can also be used for dyeing and tinting wood. The wood can be in the form of articles, such as bowls, dishes, toys, but also solid slats and beams, and also in the form of shavings, chips or chipboard. Parts of buildings can similarly be treated with the dye preparations of the present invention, as can furniture.
The application of the liquid dye preparations can be utilized for equalizing color differences in the wood or in a veneer, but also for completely changing the color of the wood or of a veneer. The liquid dye preparations can be utilized as an aqueous stain (in which case water is the main solvent), as an alcoholic-aqueous stain (i.e. the solvent is an alcohol-water mixture) or as stains involving organic solvents (about 30-95% of organic solvents; such stains may also possibly be water thinnable).
