Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Patent
1994-10-20
2000-10-24
Codd, Bernard
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
430 56, 430 64, 525 61, G03G 1504, C08F 1606
Patent
active
06136486&
ABSTRACT:
The invention is a self-cross-linked polyvinyl butyral (PVB) binder for organic photoconductors (OPC's) used in electrophotography. The no cross-linked form of the binder is available from Monsanto Co. in the U.S.A. a Butvar.TM., and from Sekisui Chemical Co. in Japan as Slek.TM.. I discovered that the PVB may be self-cross-linked by subjecting it to a thermal cure at between about 150.degree.-300.degree. C. for about 2 hours. I think other ways of cross-linking, for example, e-beam, UV or X-ray radiation, will achieve results similar to those I obtained with heat. No cross-linker, nor cross-linkable copolymer nor catalyst is required to accomplish the cross-linking. After self-cross-linking, the PV has good mechanical durability and good anti-solvent characteristics. In addition, he self-cross-linked PVB's glass transition temperature (T.sub.g) increases from about 65.degree. C. to about 170.degree. C. Also, when conventional photoconductor pigments are dispersed in the self-cross-linked PVB, they are well dispersed, and the resulting OPC's have good charge acceptance, low dark decay, and, in general, good photodischarge characteristics. Also, OPC's with the self-cross-linked PVB exhibited improved adhesion, so multi-layered OPC's made according to this invention will hav improved inter-layer bonding and longer economic lives.
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Websters II New Riverside University Dictionary pp. 916 and 1123 (1988).
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Codd Bernard
Hewlett--Packard Company
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