Browse Prior Art Database

Dodecylphenol End-Capped Epoxy Resins as Flash Fusible Toner Resins

IP.com Disclosure Number: IPCOM000120182D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 36K

Publishing Venue

IBM

Related People

Baird, BW: AUTHOR [+6]

Abstract

While bis-phenol A epoxy resins have been extensively used as toner components in a large number of electrophotographic printing and copying applications, they are unsuitable for use in flash fusible toners when they contain charge additives having acidic characteristics. With these acidic characteristics, the resins react and become cross-linked during the melt-mix process which leads to undesirable physical properties. Treatment of epoxy resins with dodecylphenol produces end-capped resins which are stable to processing, i.e., will not react or cross-link. Different molecular weight resins can be end capped in a one-step (base catalyzed) reaction.

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Dodecylphenol End-Capped Epoxy Resins as Flash Fusible Toner Resins

      While bis-phenol A epoxy resins have been extensively used as
toner components in a large number of electrophotographic printing
and copying applications, they are unsuitable for use in flash
fusible toners when they contain charge additives having acidic
characteristics.  With these acidic characteristics, the resins react
and become cross-linked during the melt-mix process which leads to
undesirable physical properties.  Treatment of epoxy resins with
dodecylphenol produces end-capped resins which are stable to
processing, i.e., will not react or cross-link.  Different molecular
weight resins can be end capped in a one-step (base catalyzed)
reaction.  This structural modification does not adversely affect the
other desirable properties of the resin, such as friability, thermal
stability, low glass transition temperature, and tribocharging
properties.  The end-capped resins are stable to the presence of
acidic charge additives, even at elevated temperatures, for days. In
addition, the solubility (compatibility) of the charge additives in
the end-capped resin is enhanced.  While a variety of phenolic
derivatives can be used to cap the epoxy resins, the use of the long
alkyl chain derivative improves the wettability of the toner to paper
and enhances fuse performance.

      Disclosed anonymously.