| 摘要 |
Polypropylene is colored readily and homogeneously by adding to the molten polymer a pigment composition consisting of polypropylene wax as a carrier, a pigment dispersed in the carrier, and a non-ionic dispersing agent in an amount sufficient to disperse the pigment in the wax at a temperature above the melting point of the latter. Many pigments and dispersing agents stable at the melting temperature of polypropylene for a period sufficient to permit dispersing the pigment in the molten polymer are commercially available.
|
