Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1994-02-25
1995-02-07
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528271, 528354, 560158, 560180, 560182, 560186, C08G 1842
Patent
active
053876652
ABSTRACT:
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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Die Makromolekulare Chemie, vol. 190, Oct. 1989, No. 10, Hironobu Fukuzaki, et al., "Low-Molecular-Weight Copolymers Composed of L-Lactic Acid and Various DL-Hydroxy Acids as Biodegradable Carriers", pp. 2571-2577.
Ajioka Masanobu
Misawa Akira
Mitsui Toatsu Chemicals Inc.
Welsh Maurice J.
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