Toner containing resin prepared by a combination of emulsion followed by suspension polymerization
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United States of America Patent
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-
Jul 10, 2001
Grant Date -
N/A
app pub date -
Oct 13, 1999
filing date -
Oct 13, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for preparing thermoplastic toner resins is disclosed and the toner resins produced by said method. More particularly, an emulsion polymerized resin, constituting a high molecular weight component, is used as a seed for subsequent suspension polymerization of a lower molecular weight component. The emulsion micelles are swelled with monomers and subsequent suspension polymerization produces particles where the high and low molecular weight components are interpenetrated to form a resin with a bimodal distribution of molecular weight. A toner composition is made using the resin as the main component. The resin particle has a first resin portion having a particle size in the range of about 50 to about 200 nm. and a number average molecular weight in the range of about 10.sup.4 to about 10.sup.7, and a second resin portion formed around the first resin portion with a number average molecular weight lower than that of said first resin portion, the resin having a polydispersity in the range of 5 to 50.
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