Fine particle application of dyes or optical brightener to leathers or fabrics in a tumbling drum at low volumes in a hydrophobic solvent

摘要

An improved process for the dyeing of organic material, especially synthetic organic material, from organic solvents with application of a short goods-to-liquor ratio, byPP(A) APPLYING A CONCENTRATED ORGANIC DYE LIQUOR HEATED TO AT LEAST 80 C with a goods-to-liquor ratio of 1:1.5 to 1:4 in atomized form to said organic material maintained in motion in an essentially closed chamber, preferably at a temperature below the absorption temperature of the dyestuffs, said concentrated organic dye liquor containing at least one dyestuff or optical brightener dissolved and/or finely dispersed in an organic solvent and having affinity to the fibers of the substrate to be dyed;PP(B) HEATING THE THUS TREATED ORGANIC MATERIAL AFTER APPLICATION OF THE WHOLE AMOUNT OF THE DYE LIQUOR TO A TEMPERATURE OF 100 TO 150 C;PP(c) finishing the dyeing by keeping the treated organic material at this temperature in an advantageously saturated organic solvent vapor atmosphere until complete fixation of the dyestuff is obtained;PP(D) OPTIONALLY SUBSEQUENTLY FINISHING AND/OR WASHING THE DYED ORGANIC MATERIAL AFTER EXTENSIVE REMOVAL OF THE RESIDUAL LIQUOR, BY APPLYING AN ORGANIC SOLUTION, SUSPENSION AND/OR ORGANIC SOLVENT IN ATOMIZED FORM AT A GOODS-TO-LIQUOR RATIO OF 1:1.5 TO 1:4, ANDPP(E) DRYING THE DYED ORGANIC MATERIAL.