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Silver coatings and methods of manufacture

  • US 8,399,027 B2
  • Filed: 01/13/2006
  • Issued: 03/19/2013
  • Est. Priority Date: 04/14/2005
  • Status: Active Grant
First Claim
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1. A method of making an antimicrobial wound dressing, the method comprising:

  • preparing a composition comprising silver sulfate and water;

    wherein any stabilizing agent is present in an amount less than 50 ppm based on the total weight of the silver sulfate composition;

    coating the silver sulfate composition on a cellulosic substrate;

    drying the coated substrate at a temperature of 125°

    C. to 190°

    C., such that the coated substrate darkens in proportion to the temperature, turning to a yellow color, a brown color, or a dark brown color;

    wherein after drying, the composition includes less than 20 wt % silver metal, based on the total weight of silver components in the composition; and

    maintaining the dried silver sulfate coated substrate at a relative humidity of no more than 50%;

    wherein the dry antimicrobial wound dressing is color stable.

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