Polyolefin waxes modified to make them polar in photocopier toners
View Patent ↗The present invention relates to the use of polyolefin waxes which have been prepared by means of metallocene catalysts and have been modified to make them polar in photocopier toners and also to photocopier toners comprising such polyolefin waxes modified to make them polar.
1. A method for making a photocopier toner comprising the steps of polar modifying a nonpolar ethylene homopolymer wax prepared using a metallocene catalyst to form a polar ethylene homopolymer wax and adding said polar ethylene homopolymer wax to the photocopier toner, wherein said polar modifying step further comprises reacting said nonpolar ethylene homopolymer wax prepared using a metallocene catalyst with maleic anhydride, wherein the polar ethylene homopolymer wax has a melt viscosity measured at 170° C. of from 5 to 10 000 mPa.s, a saponification number of from 0.1 to 100 mg KOH/g and a softening point of from 80 to 160° C.
2. A photocopier toner made in accordance with the method of claim 1 .
3. A photocopier toner comprising at least one resin, at least one pigment, and at least one polar modified ethylene homopolymer wax prepared in accordance with the method of claim 1 .