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Inhibition of DEH Photochemistry by Terephthalate-Containing CTL Polymers

IP.com Disclosure Number: IPCOM000102266D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Cox, RJ: AUTHOR [+4]

Abstract

Exposure of 4-diethylaminobenzaldehyde diphenylhydrazone (DEH) to room light causes its photochemical conversion to an indazole derivative, resulting in fatigue of the electrical properties of organic photoconductors. By incorporating polyesters containing terephthalate moieties into the charge transport layer (CTL) binder, the photochemistry of DEH is greatly retarded. Disclosed is a CTL formulation containing DEH and a polymeric binder, wherein the polymer is optimized so as to inhibit the photochemistry of DEH when exposed to 400-480 nm light (blue light). Ester Content and meta/para Ratio PC = polycarbonate PE = polyester PC/PE = carbonate/ester copolymer

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Inhibition of DEH Photochemistry by Terephthalate-Containing CTL Polymers

       Exposure of 4-diethylaminobenzaldehyde diphenylhydrazone
(DEH) to room light causes its photochemical conversion to an
indazole derivative, resulting in fatigue of the electrical
properties of organic photoconductors.  By incorporating polyesters
containing terephthalate moieties into the charge transport layer
(CTL) binder, the photochemistry of DEH is greatly retarded.
Disclosed is a CTL formulation containing DEH and a polymeric binder,
wherein the polymer is optimized so as to inhibit the photochemistry
of DEH when exposed to 400-480 nm light (blue light).
              Ester Content and meta/para Ratio
                        PC = polycarbonate
                        PE = polyester
                     PC/PE = carbonate/ester copolymer

      CTL Polymer     % Ester     meta/para Ratio
                 PC                 0             --
                 PE/PC-36          36           0.2/1.0
                 PE/PC-46          46           9.0/1.0
                 PE/PC-62          62           0.2/1.0
                 PE/PC-69          69           0.3/1.0
                 PE/PC-87          87           6.0/1.0
                 PE               100           0.8/1.0

      The optical absorption spectra of a variety of DEH/CTL
formulations (using the polymer...