Industrial Technology Research Institute

Sinonar Corporation

Tsong-Shin Jean

Chen-Jen Yang

Tzu-Yu Lin

Weir-Torn Jiaang

Jui-Fa Chang

Tsing-Tang Song

Chih-Shin Chuang

Kuo-Chu Yeh

Kuei-Fei Teng

Han-Bin Cheng

Kai-Der Ker

Lung-Tarn Wu

Ching-Liang Yang

The present invention relates to a silicon-containing copolymer which includes a maleic anhydride repeating unit, a norbornene repeating unit, and at least one silicon group-containing norbornene repeating unit. The silicon-containing copolymer is suitable for use as a top layer resist in a bilayer resist system.

Silicon-containing copolymer and photosensitive resin composition containing the same

A family of photoreceptors for use in electrophotography are disclosed which contain a binary charge generation composition of oxytitanium phthalocyanine and copper phthalocyanine. The charge generation composition exhibits adjustable photosensitivity by adjusting a ratio between said oxytitanium phthalocyanine and said copper phthalocyanine. To optimize its performance, the charge generation composition is subject to an ammonia-modified complexation-mediated crystal transformation, and the resultant composition is characterized by Bragg diffraction angles (2.theta..+-.2.degree.) of 7.7, 9.4, 10.7, 13.3, 15.2, 15.7, 26.3, 27.4, and 28.4 degrees with respect to the CuK.alpha. characteristic X-ray wavelength at 1.54 .ANG. and absorption maxima centered around 615, 690, and 770 nm in the optical absorption spectrum. The photosensitivity of the charge generation composition can be modulated according to the formula of ##EQU1## where i denotes each component in the charge generation mixture, X is the molar fraction V.sub.ddp is the dark development potential and E.sub.1/2 is the half decay energy.

Infrared sensitive electrophtographic photoreceptors and method for

An ammonia-modified titanyl phthalocyanine for use in preparing charge generating layer of a photoreceptor is disclosed. The ammonia-modified titanyl phthalocyanine is obtained by a process comprising the following steps: (a) reacting titanium tetrachloride with halogen-containing naphthalene to obtain an unmodified titanyl phthalocyanine; (b) dispersing the unmodified titanyl phthalocyanine in an organic solvent; and (c) subjecting the unmodified titanyl phthalocyanine to an ammonia-induced complexation-mediated crystal transformation so as to obtain the ammonia-modified titanyl phthalocyanine. The ammonia-induced complexation-mediated crystal transformation step can be achieved by either bubbling ammonia gas through the titanyl phthalocyanine-containing organic solution or by adding an ammonia-saturated aqueous solution to the titanyl phthalocyanine-containing organic solution. The ammonia-modified titanyl phthalocyanine is characterized by having Bragg diffraction angles of 7.5, 9.3, 13.6, 14.3, 17.9, 24.0, 27.2, and 29.1 degrees, and vibrational absorption resonances at 1492 cm.sup.-1, 1416 cm.sup.-1, 1333 cm.sup.-1, 1120 cm.sup.-1, 1072 cm.sup.-1, 962 cm.sup.-1, 894 cm.sup.-1, 752 cm.sup.-1, and 731 cm.sup.-1. The photoreceptor shows excellent spectral sensitivity at wavelengths in the near-infrared range (750-825 nm), and excellent cyclic stability evidenced by the observed negligible changes in the dark development potential after prolonged exposure cycles.

Electrophotographic photoreceptors containing titanyl phthalocyanine

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Hsinchu, Taiwan

Tsong-Shin Jean