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Method and a composition for producing an undercoat layer using dialkyl malonate blocked isocyanates (for electrophotographic applications)

  • US 7,937,023 B2
  • Filed: 07/09/2004
  • Issued: 05/03/2011
  • Est. Priority Date: 07/09/2004
  • Status: Expired due to Fees
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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