Method and a composition for producing an undercoat layer using dialkyl malonate blocked isocyanates (for electrophotographic applications)
First Claim
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1. A method for coating an electrophotographic process element adapted to receive an image from a light source with the light image then being converted to an electric charge image with a conductive polyurethane undercoat layer;
- the method comprising;
a) producing a coating solution comprising a dialkyl malonate capped isocyanate or polyisocyanate, a polyol, a monofunctional alcohol and at least one finely divided metal oxide or mixtures thereof;
b) coating the substrate with the coating solution to produce a coated substrate; and
,c) heating the coated substrate at a temperature up to about 140°
C. wherein the at least one metal oxide is present in an amount equal to from about 40 to about 90 weight percent of solids in the polyurethane layer.
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Abstract
A method and a composition for the production of surface smoothing polyurethane layers for application to a substrate prior to subsequent application of a charge generation layer for electrophotographic applications by preparing a coating solution containing a dialkyl malonate capped isocyanate or polyisocyanate, a polyol and at least one finely-divided metal oxide, coating the substrate with the coating solution and heating the coating solution to a temperature up to about 140° C.
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Citations
24 Claims
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1. A method for coating an electrophotographic process element adapted to receive an image from a light source with the light image then being converted to an electric charge image with a conductive polyurethane undercoat layer;
- the method comprising;
a) producing a coating solution comprising a dialkyl malonate capped isocyanate or polyisocyanate, a polyol, a monofunctional alcohol and at least one finely divided metal oxide or mixtures thereof; b) coating the substrate with the coating solution to produce a coated substrate; and
,c) heating the coated substrate at a temperature up to about 140°
C. wherein the at least one metal oxide is present in an amount equal to from about 40 to about 90 weight percent of solids in the polyurethane layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
- the method comprising;
Specification