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Merchandisers having anti-fog coatings and methods for making the same

  • US 8,221,846 B2
  • Filed: 11/10/2009
  • Issued: 07/17/2012
  • Est. Priority Date: 05/02/2002
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing a refrigerator door having a substantially transparent substrate, the method comprising the acts of:

  • mixing an isocyanate with a polyol to form a mixture, the isocyanate comprising a compound selected from the group consisting of ε

    -caprolactam blocked toluene diisocyanate, 3,5-dimethylpyrazole blocked toluene diisocyanate, 3,5-dimethylpyrazole blocked isophorone diisocyanate, 3,5-dimethylpyrazole blocked isophorone diisocyanate trimer, 3,5-dimethylpyrazole blocked hexamethylene diisocyanate biuret, diethyl malonate blocked hexamethylene diisocyanate biuret, ε

    -caprolactam blocked hexamethylene diisocyanate trimer, 3,5-dimethylpyrazole blocked hexamethylene diisocyanate trimer, methylethylketoxime blocked hexamethylene diisocyanate trimer, 3,5-dimethylpyrazole and diethyl malonate blocked isophorone diisocyanate trimer, 3,5-dimethylpyrazole and diethyl malonate blocked hexamethylene diisocyanate biuret, 3,5-dimethylpyrazole and diethyl malonate blocked hexamethylene diisocyanate trimer and a combination thereof, wherein the mixture comprises less than about 55% by weight of polyol, and wherein the mixture is substantially free of surfactant;

    applying the mixture to at least a portion of the substantially transparent substrate; and

    curing the mixture to form a coating, the coating showing a change in L* of less than about 10.0, a change in a* of less than about 1.2, and a change in b* of less than about 6.0, when the coating is exposed to fluorescent light having a radiant intensity of 0.05 mw/cm2 over a period of greater than 5 days, wherein, using CIELAB values, L* measures the psychometric lightness of a coating, an L* value of 100 indicating clear and a value of 0 indicating black, a* measures the color of the coating as referenced against a red(+) and green(−

    ) axis, and b* measures the color of the coating as referenced against a yellow(+) and blue(−

    ) axis,wherein the coating comprises a hydrophobic surface,wherein the substrate is part of a refrigerator door or is used to manufacture a refrigerator door.

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