Organic dyes and method of production

Details Organic dyes and method of production Organic dyes and method of production

C - Chemistry, Metallurgy

09

B

241/129, 8/47, 2

C09B 1/00 (2006.01) C09B 67/00 (2006.01)

Patent

CA 1047492

ABSTRACT A method for producing a granular organic dye material having an average particle size of 500 to 900 microns, preferably 500 to 700 microns, and the product thereof, in which finely divided dye material of the order of 20 microns is subjected to an ambient temperature pressure bonding, such as by rolling, to form a thin coherent sheet of material. The thin sheet of material is then mechanically comminuted, for example in a hammer mill, to produce the desired granular dye material with minimum of fines. The granular material and the fines are separated by an air separation device and the fines recirculated to the pressure bonding step.

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