Abstract: A low plate-out fluorescent pigment concentrate containing from about 5 up to about 40 weight percent of a fluorescent pigment, based upon the total weight of the fluorescent pigment concentrate, about 5 to about 20 weight percent of an inorganic filler, based upon the total weight of the fluorescent pigment concentrate, and a minimum of 2 up to about 10 weight percent of a silica gel or a precipitated silica, based upon the total weight of the fluorescent pigment concentrate. The inert filler has an average particle size of about 2 microns or less. There is also from about 1 to about 10 weight percent of an organic polymer selected from the group consisting of (i) an oxidized polyethylene wax, (ii) an unoxidized polyethylene wax, (iii) a low molecular weight ethylene-acrylic acid copolymer, (iv) a bivalent metal salt of (1) or (iii), and (v) a combination of at least two of (i), (ii), (iii) and (iv), based upon the total weight of the fluorescent pigment concentrate.

Abstract: An apparatus is disclosed for comminuting a colored pigment bar and mixing the comminuted pigment with an uncolored plastic material to form a colored plastic material which is subsequently molded or extruded into a colored plastic article. The apparatus features a rotating, discontinuous cutting blade to minimize static electricity formation so as to allow more thorough mixing of the pigment with the uncolored material. A storage mechanism is also disclosed to store the colored pigment bars and bring them into contact with the cutting blade.

Abstract: A micrometer mixer having a rotary cutter with a replaceable shaver means is used to powderize pigment bars and mix it with plastic pieces. The apparatus further has a hopper and chute mechanism and a controllable trigger mechanism to automatically feed the pigment bar to the replaceable shaver means.

Abstract: Fatty acid amide coated pigments are obtained and used to formulate with uncolored thermoplastic materials. The colors of the pigments are fully developed and extremely high pigment loadings are obtained. The coated pigments are formed by admixing the pigment with melted fatty acid amide; solidifying the material by cooling it; grinding the material; and separating out the fines. The coated pigments particles are compounded with thermoplastic materials by low shear means, such as, injection molding. An improved form of the coated pigments can be obtained by admixing the melted fatty acid amide, and the pigment; extruding the admixture to form a creamy mass; solidifying and forming the creamy mass by passing it through cold and forming rollers; grinding the resultant wafer-like material; and separating out the fines.

Abstract: Fatty acid amide coated pigments are obtained and used to formulate with thermoplastic or thermoset materials. The colors of the pigments are fully developed and extremely high pigment loadings are obtained. The coated pigments are formed by admixing the pigment with melted fatty acid amide; solidifying the material by cooling it; grinding the material; and separating out the fines. The coated pigment particles are compounded with thermoplastic or thermoset materials by low shear means, such as, injection molding. An improved form of the coated pigments can be obtained by admixing the melted fatty acid amide and the pigment; extruding the admixture to form a creamy mass; solidifying and forming the creamy mass by passing it through cold and forming rollers; grinding the resultant wafer-like material; and separating out the fines.