Patent ID: 8389189
Filing Date: 2013-03-05
Classification: G03G

Abstract:
1. A resin binder for toners, comprising core/shell particles each comprising a core portion containing a crystalline polyester obtained by polycondensing an alcohol component containing an aliphatic diol having 2 to 12 carbon atoms and a carboxylic acid component containing an aliphatic dicarboxylic acid compound having 8 to 12 carbon atoms in an amount of from 70 to 100 mol %, and a non-crystalline resin (A) obtained by polycondensing an alcohol component and a carboxylic acid component containing at least one succinic acid compound selected from the group consisting of an alkyl (C 9 to C 18 ) succinic acid and an alkenyl (C 9 to C 18 ) succinic acid in an amount of from 3 to 60 mol %; and a shell portion containing a non-crystalline resin (B) obtained by polycondensing a carboxylic acid component and an alcohol component containing an aliphatic dialcohol having 2 to 5 carbon atoms in an amount of 80 mol % or more; wherein the carboxylic acid component of the non-crystalline resin (B) contained in the shell portion contains at least one succinic acid compound selected from the group consisting of an alkyl (C wherein the non-crystalline resin (B) contained in the shell portion has a softening point lower than a softening point of the non-crystalline resin (A) contained in the core portion.