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Photocatalyst-binder compositions

  • US 5,854,169 A
  • Filed: 05/09/1997
  • Issued: 12/29/1998
  • Est. Priority Date: 10/26/1993
  • Status: Expired due to Term
First Claim
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1. A composition comprising:

  • particles of a photocatalyst activated by light, said particles having a diameter of about 1-100 nm and a surface area of at least 30 m2 /g;

    said photocatalyst capable of catalyzing oxidation or reduction reactions;

    a binder for adhering said particles to a surface, said binder consisting essentially of a substantially non-oxidizable polymer having a backbone sequence of 12 or more atoms, where no more than one in six backbone atoms is carbon, the binder consisting of less than 20 wt % oxidizable carbon and hydrogen atoms;

    wherein the particles are dispersed throughout said binder, and wherein the composition forms an abrasion-resistant, thermostable and adherent film when applied to a surface, the binder transmitting a substantial portion of activating light to activate the photocatalyst particles;

    said composition, when applied to a surface and in contact with an organic compound, being Effective, in the presence of activating light, to degrade at least a portion of said organic compound.

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