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Resins for electrohotographic toners
| Details |
Inventors: Misawa, Akira; Ajioka, Masanobu;
Assignee: Mitsui Toatsu Chemicals, Inc. (Tokyo, JP)
Primary Examiner: Welsh; Maurice J.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A resin for electrophotographic toner comprising a degradable polyester resin which is an amorphous poly (.alpha.-hydroxycarboxylic acid) prepared by direct dehydration-polycondensation of an .alpha.-hydroxycarboxylic acid and having, preferably, a number-average molecular weight ranging from 2000 to 7000. A further resin for electrophotographic toner comprising a degradable polyester resin which may be prepared by reacting an amorphous or semicrystalline poly (.alpha.-hydroxycarboxylic acid), having a number-average molecular weight ranging from 1000 to 7000 or 2000 to 7000 and prepared by direct dehydration-polycondensation of an .alpha.-hydroxycarboxylic acid, with a polyol having at least three hydroxyl groups or a polycarboxylic acid having at least three carboxyl groups in the molecule and, in case of the reaction product with the polyol can further be reacted with a diisocyanate to give an urethane-modified polyester. These polyesters can likewise be used as resins for toner. |
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DETAILED DESCRIPTION OF THE INVENTION The term "amorphous poly-(.
alpha.
-hydroxycarboxylic acid)" herein used means "poly(.
alpha.
-hydroxycarboxylic acid)" which does not have a melting point and is prepared by directly dehydrating and polycondensing a mixture of optical isomers of .
alpha.
-hydroxycarboxylic acid or several kinds of .
alpha.
-hydroxycarboxylic acids.
The presence of any melting point can be confirmed by a thermal property-determining device generally used such as DSC.
In the preparation of amorphous poly-(.
alpha.
-hydroxycarboxylic acid) of this type, the content of the optical isomers is at least 10 mole% and more preferably at least 20 mole% on the basis of the molar amount of the whole .
alpha.
-hydroxycarboxylic acid monomers.
This is because if the content thereof is less than 10 mole%, the resulting poly-(.
alpha.
-hydroxycarboxylic acid) has a clear melting point and impairs the fixability of the final toner product.
Amorphous poly-(.
alpha.
-hydroxycarboxylic acid) prepared by other means such as copolymerization of different kinds of .
alpha.
-hydroxycarboxylic acids can likewise be used in the present invention in addition to the foregoing poly-(.
alpha.
-hydroxycarboxylic acids).
In other words, the amorphous poly(.
alpha.
-hydroxycarboxylic acids) usable herein are not limited to those prepared by the specific production methods and those having specific mixing ratios of monomers.
In addition, the term "semicrystalline poly(.
alpha.
-hydroxycarboxylic acid)" means, contrary to the foregoing amorphous polymer, a poly-(.
alpha.
-hydroxycarboxylic acid) which has a clear melting point and is prepared by directly dehydrating and polycondensing an .
alpha.
-hydroxycarboxylic acid.
In the preparation of semicrystalline poly(.
alpha.
-hydroxycarboxylic acid) of this type, the content of the optical isomers is less than 10 mole% and more preferably 0 to 5 mole% on the basis of the molar amount of the wholes .
alpha.
-hydroxycarboxylic acid monomers used.
If the content of the optical isomer is not less than 10 mole%, the resulting poly-(
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Molecular Biology 
