Patent ID: 6063536
Filing Date: 2000-05-16
Classification: C08F,G03G

Abstract:
A thermal fixing developer material for electrography comprising(A) a propylene-based copolymer wax wherein said polyproplene-based copolymer hasa weight average molecular weight (M.sub.w)determined by gel permeation chromatography (GPC) of from 3,000 to 50,000,a melting point determined by differential scanning calorimer (DSC) of from 120.degree. C. to 140.degree. C., anda propylene content of at least 90% by mole of propylene, and wherein said propylene-based copolymer hasa compositional distribution CM.sub.n /CM.sub.w determined by gel permeation chromatography-Fourier transform infrared spectroscopy (GPC-FTIR) of from 1.0 to 2.0, CM.sub.n being the ethylene content in % by mole, at the point in the GPC chromatogram corresponding to the number average molecular weight, determined by GPC-FTIR, and CM.sub.w being the ethylene content in % by mole, at the point in the GPC chromatogram corresponding to the weight average molecular weight, determined by GPC-FTIR, or/ anda ratio X.sub.R of from 1.0 to 1.5, where X.sub.R=X.sub.L X.sub.H, X.sub.L being an average ethylene content of a lower molecular weight portion, determined by the GPC-FTIR, and X.sub.H being an average ethylene content of a residual higher molecular weight portion, determined by the GPC-FTIR, said lower molecular weight portion being the lower molecular portion of the GPC chromatogram occupying 30% of the total area of the chromatogram, said residual higher molecular weight portion being the higher molecular weight portion of the GPC chromatogram occupying the residual 70% of the total area of the chromatogram;(B) a binder; and(C) a colorant.