black masterbatch

Black masterbatch

discloses the addition of carbon black and dispersing agent of small molecular weight in the esterification reaction. However, it is necessary to use precipitation, centrifugation, and filtration in order to remove a large amount of agglomerates of carbon black before continuing polymerization in order to obtain black masterbatch. However, this black masterbatch contains only 1-10% of

.carbon black by weight and often contaminates the reactor or reactor piping

teaches using fragile dispersing hydrocarbonic resin or rosin oil resin with a softening point between 70°-195° C. and copolymer with a melting point between 140°-200° C. to manufacture black masterbatch with high concentration. According to this patent, carbon black is first charged into a mill with cationic surfactant and water, ground into colloidal-like fluid aqueous dispersion of carbon black, and then charged with dispersive resin under the control of PH value at a predetermined range. Thereafter, the water is removed and the dried material is blended with copolyester through an extruder to form pellets. However, the manufacture and treatment of the dispersing liquid is relatively complicated

disclose mixing carbon black with liquid polyester to form liquid coloring agent for polyester spinning. However, the liquid coloring agent will lower the viscosity of the spinning polyester and will not have sufficient thermal stability at the spinning temperature between 280°-300° C. so that the liquid coloring agent will be degraded into gas with smaller molecular weight. Further, the polyester will turn to be yellow in color and the filament breakage rate will be increased. In addition, there will be badly influence to the strength, stretch ability, and heat resistance of the fiber

This invention relates to an improved black masterbatch for polyester spinn

It is the primary object of the present invention to provide a black masterbatch of which the carbon black is well dispersed and will not be agglomerated

It is another object of the present invention to provide a black masterbatch of which the components are easily obtained

It is still another object of the present invention to provide a black masterbatch which has a simple manufacturing process

It is still another object of the present invention to provide a black masterbatch which does not need the addition of any surfactant or solvent

It is a further object of the present invention to provide a black masterbatch which possesses good thermal stabilit

Other objects and merits and a fuller understanding of the present invention will be obtained by those having ordinary skill in the art when the following detailed de script ion of the preferred embodiment is read in conjunction with the accompanying drawings wherein like numerals refer to like or similar parts