Showing papers on "Jet mill published in 1980"

Continuous process for preparing dry metallic salts of higher fatty acids

Abstract: Metallic salts of higher molecular weight fatty acids are produced in a continuous process by feeding fatty acid and base into a plug flow reactor to maintain a residence time of about 2 to about 60 minutes at a temperature of about 75° F. to about 280° F. to obtain a metallic salt, then grinding the metallic salt in a hammer mill to obtain coarse particles and then grinding the coarse particles in a jet mill to obtain fine particles of the metallic salt. Optionally, the fatty acid and base may be fed initially into a stirred-tank reactor to maintain a residence time of about 10 to about 80 minutes at a temperature of from about 115° F. to about 300° F. to initiate metallic salt reaction before feeding the metallic salt reaction mixture into the plug flow reactor.

One-component magnetic developer for developing and transferring positive charge image

Abstract: PURPOSE: To provide the titled developer with improved developing efficiency, transferring efficiency and halftone reproducibility by dispersing magnetic powder having specified characteristics, higher fatty acid or its metal salt and an alcohol- soluble metal-contg. dye in a vinyl aromatic or acrylic resin. CONSTITUTION: The following components are kneaded with a roll mill: 55pts.wt. magnetic powder such as magnetite powder having ≥0.42g/ml bulk density, ≥0.35μm average maximum size measured with an electron microscope and 1W 1.55 maximum size/minimum size ratio, a 41.5pts.wt. styrene-acrylic copolymer, 3.5pts.wt. low mol. wt. polypropyrene, 0.5 part zinc stearate and a 0.7 part negative charge controller such as "BONTRONS-31 ". The kneaded material is melted, allowed to cool, coarsely pulverized, and finely pulverized with a jet mill to obtain a magnetic toner. COPYRIGHT: (C)1981,JPO&Japio