Sinonar Corporation

Tzea-Ching Hung

Chen-Jen Yang

Kuo-Chu Yeh

An electrophotographic photoreceptors having a protective layer which contains a specially cross-linked phenolic resin. The cross-linked phenolic resin contains both methylene ether linkages and methylene linkages that are provided such that the oxygen element content of the cross-linked phenolic resin contains no greater than 23.5 wt %, or more preferably between about 21 wt % and 23.5 wt %, of oxygen atoms. In a preferred embodiment, the specially cross-linked phenolic resin is formed by (a) raising the cross-linking temperature from 80.degree..+-.10.degree. C. to about 130.degree. C., in a cascading manner involving at least one intermediate treatment temperature; then (b) lowering the cross-linking temperature from about 130.degree. C. to 80.degree..+-.10.degree. C. The protective layer improves the chemical stability and mechanical strength of the electrophotographic photoreceptor while retaining the desired photoelectric properties thereof.

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Chiang-Hwa Hsien, Taiwan

Tzea-Ching Hung