Polyurethane foam toner supplying roller and method for...

Details Polyurethane foam toner supplying roller and method for... Polyurethane foam toner supplying roller and method for...

2008-05-28

2011-10-11

Gray, David (Department: 2852)

Electrophotography

Image formation

Development

Reexamination Certificate

active

08036580

ABSTRACT:
A toner supplying roller is provided in which a polyurethane foam layer can be obtained without decreasing the reactivity of the polyurethane material, and in which contamination by a catalyst remaining in the polyurethane foam layer is suppressed, so that a good image can be obtained. Moreover, the toner supplying roller has suitable aperture cells in the surface, suitably performs the scraping off of the development residual toner and toner supply between the toner supplying roller and the developing roller, and forms a uniform toner thin film on the developing roller, so that a good image can be obtained. In a toner supplying roller including a polyurethane foam layer that is formed on the mandrel periphery using a polyurethane material including a polyol and a polyisocyanate, the polyol and the polyisocyanate have an amine number of 3 mg KOH/g or more and 15 mg KOH/g or less in total.

REFERENCES:
patent: 5768668 (1998-06-01), Shiraki et al.
patent: 2008/0070147 (2008-03-01), Uchino et al.
patent: 9-274373 (1997-10-01), None
patent: 2001-9958 (2001-01-01), None
patent: 2002-363237 (2002-12-01), None
patent: 2002361649 (2002-12-01), None
patent: 2004-37630 (2004-02-01), None
patent: 2004151499 (2004-05-01), None
Machine English Translation of JP 2002-361649.
Machine English Translation of JP 2004-151499.

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