| abstract |
This improved toner for electrophotography is composed mainly of a vinyl polymer. The vinyl polymer is specified as follows; its mean molecular number lies between 1,000 and 10,000 (pref. 2,000 and 8,000), its mean mol wt. lies between 41 and 200 (pref. 50 and 150), its glass transition temp lies between 50 and 70 deg.C (pref. 50 ar 65 deg.C), its viscosity when the sheer rate is 1 sec-1 at 110 deg.C is 50,000-5,000,000 poise (preferred 50,000-3,500,000) and when the sheer rate is 10,000 sec -1 at 190 deg.C it is 10-1,000 poise (prefd. 100-1,000 poise). The polymer is that the monomer to be polymerised is selected from among acrylate methyl, acrylate ethyl, acrylate propyl, acrylate butyl, acrylate octyl, methacrylate methyl, methacrylate ethyl, methacrylate propyl, vinyltoluene, etc. |