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US 5,616,532 AGranted
Photocatalyst-binder compositions
AssigneeE. Heller & Company
InventorsAdam Heller, Michael V. Pishko, Ephraim Heller
Life of this patent
Estimating the term…
Abstract
A photocatalyst composition containing a substantially non-oxidizable binder which allows large amounts of photocatalytic particles to be adhered to a surface. Upon application to a surface, the composition dries or cures to form an adherent, abrasion-resistant, thermostable, and photocatalytic coating.
Claims49
A self-cleaning composition comprising:
- particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions to degrade organic compounds that contact the composition;
- 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 incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects.
A self-cleaning composition comprising:
- particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions to degrade organic compounds that contact the composition;
- a binder for adhering said particles to a surface, said binder consisting essentially of hydrated aluminum oxide, hydrated silicon oxide, colloidal tin dioxide, or mixtures thereof,
- 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 incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects.
1 more element
A curable self-cleaning composition comprising:
- (a) ultraviolet light-absorbing photocatalyst particles having a surface area of at least about 30 m.sup.2 /g,;
- (b) a binder consisting essentially of a substantially non-oxidizable polymer, hydrated aluminum oxide, hydrated silicon oxide, colloidal tin oxide, or mixtures thereof, wherein the particles of the photocatalyst are dispersed in the binder, and wherein the binder transmits a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects.
A self-cleaning composition comprising:
- particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions to degrade organic compounds that contact the composition;
- 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
- a film-forming hydrophobic composition permeable to organic molecules and to molecular oxygen,
- wherein the composition dries to form an abrasion-resistant, thermostable and adherent film when applied to a surface, the binder transmitting a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects.
3 more elements
A composite adhered to a surface, the composite comprising:
- a first layer consisting essentially of particles of a photocatalyst responsive to ultraviolet light dispersed in a substantially non-oxidizable binder, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions to degrade organic compounds, 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;
- and
- a second, hydrophobic layer permeable to organic molecules and to molecular oxygen.
A self-cleaning composition comprising:
- particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm and a surface area at least about 30 m.sup.2 /g;
- and
- a substantially non-oxidizable binder for adhering particles to a surface, said binder consisting essentially of an inorganic colloid or a polymer having a backbone sequence of 12 or more atoms where no more than one in six backbone atoms is carbon, the binder having fewer than 20% by weight oxidizable carbon and hydrogen atoms,
- wherein the particles are dispersed in the binder and the composition forms an abrasion-resistant, thermostable and adherent film, the binder transmitting a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects.
1 more element
A self-cleaning composition comprising:
- particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm and a surface area at least about 30 m.sup.2 /g;
- and
- a substantially non-oxidizable binder for adhering said particles to a surface,
- wherein the particles are dispersed in the binder in the absence of photoactivity-masking agents, and wherein the composition forms an abrasion-resistant, thermostable and adherent film when applied to a surface, the binder transmitting a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects.
1 more element
Dependencies are inferred from the claim text.