Polyester resin composition for toner

Abstract

A polyester resin composition for a toner comprising a titanium compound in an amount of from 0.005 to 4% by weight, and an inorganic phosphorus compound in an amount of from 0.001 to 5% by weight; a toner comprising the polyester resin composition as defined above; and a process for preparing the polyester resin composition for a toner as defined above, comprising the step of polycondensing the raw material monomers for the polyester in the presence of a titanium compound and an inorganic phosphorus compound. The polyester resin composition for a toner is suitably used as a resin binder for a toner for developing a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like, a process for preparing the same, and a toner comprising the polyester resin composition.

1 . A polyester resin composition for a toner comprising: 
 the product of condensing raw material monomers in the presence of a titanium compound catalyst represented by the formula (I):     Ti(X) n (Y) m   (I)   wherein X is a triethanolaminate or a diethanolaminate; Y is an alkoxy group, alkenyloxy group or acyloxy group, each having a total number of carbon atoms of from 1 to 28; and each of n and m is an integer of from 1 to 3, wherein a sum of n and m is 4; in an amount of from 0.005 to 4% by weight, and    an inorganic phosphorus compound in an amount of from 0.001 to 5% by weight.    
   
   
       2 . The polyester resin composition according to  claim 1 , wherein a weight ratio of the titanium compound to the inorganic phosphorus compound is from 0.07 to 5.  
   
   
       3 . The polyester resin composition according to  claim 1 , wherein the inorganic phosphorus compound is an inorganic phosphoric acid or a salt thereof.  
   
   
       4 . The polyester resin composition according to  claim 1 , wherein the inorganic phosphorus compound is a polyphosphoric acid or a salt thereof.  
   
   
       5 . The polyester resin composition according to  claim 4 , wherein the polyphosphoric acid or a salt thereof has a number-average molecular weight of from 110 to 1000.  
   
   
       6 - 8 . (canceled)  
   
   
       9 . The polyester resin composition according to  claim 1 , which is prepared by using as raw material monomers for the polyester an alcohol component comprising an alcohol having a bisphenol A adduct in an amount of from 10 to 100% by mol and a carboxylic acid component.  
   
   
       10 . The polyester resin composition according to  claim 1 , which is prepared by using as raw material monomers for the polyester an alcohol component and a carboxylic acid component comprising an alkenyl-substituted succinic acid compound of which alkenyl group has 2 to 20 carbon atoms.  
   
   
       11 . The polyester resin composition according to  claim 1 , wherein the softening point of the polyester resin composition is from 90° to 170° C.  
   
   
       12 . A toner comprising the polyester resin composition as defined in  claim 1 .  
   
   
       13 . A process for preparing the polyester resin composition for a toner as defined in  claim 1 , comprising the step of polycondensing the raw material monomers for the polyester in the presence of a titanium compound and an inorganic phosphorus compound.