Process fro producing resin for a toner
AssigneeMitsubishi Rayon Co., Ltd.
InventorsRyo Funato, Syuji Takahiro, Keiji Yoshida, Shinji Kubo, Motoshi Inagaki
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Abstract
A process for producing a toner resin by a two-step suspension polymerization process, which entails preparing a polymer of high molecular weight having a weight average molecular weight of greater than about 350,000 from at least one monomer having a polymerizable vinyl group using a compound having at least three t-butyl peroxide groups in one molecule, as a polymerization initiator, and then preparing a low molecular weight polymer in the presence of the high molecular weight polymer. A toner having an excellent fixing property and offset resistance can be obtained from the above resin.
Claims6
A resin for dry type toner, consisting essentially of a high molecular weight polymer having a weight average molecular weight of greater than about 350,000 and obtained from at least one monomer having a polymerizable vinyl group using a compound having at least three t-butyl peroxy groups per molecule as initiator, and a low molecular weight polymer prepared in the presence of said high molecular weight polymer, and having a softening temperature (Ts) of about 110.degree. C. to 170.degree. C. and a glass transition point (Tg) of about 40.degree. C. to 63.5.degree. C.
Dependencies are inferred from the claim text.