Patent Issued for Transparent, Colorless Infrared Radiation Absorbing Compositions Comprising Nanoparticles

By a News Reporter-Staff News Editor at Journal of Engineering -- PPG Industries Ohio, Inc (Cleveland, OH) has been issued patent number 8324300, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Adochio, William (Edmond, OK); Gaudet, Gregory T. (Newark, IL); Rardon, Daniel E. (Pittsburgh, PA); Still, Mark A. (Firestone, CO).

This patent was filed on January 20, 2010 and was cleared and issued on December 4, 2012.

From the background information supplied by the inventors, news correspondents obtained the following quote: "Compositions with enhanced capacity to absorb infrared ('IR') radiation are desired in many applications, such as for solar control films for architectural and automobile glass, reheat additives in polymers, and additives to increase the drying and/or cure rate of polymeric coating compositions, among others. As a result, IR absorbing materials, such as indium tin oxide, antimony tin oxide, titanium nitride, and lanthanum hexaboride particles are often included in such compositions. For many applications, however, such particles do not provide a sufficiently high level of IR radiation absorption in the wavelength range of .about.800 to 1400 nanometers, which is often of particular commercial importance. As a result, to achieve adequate performance, the IR absorbing particles must often be included in the composition in amounts such they impart an undesired color to the composition in applications where colorless compositions are required. Moreover, since such additives are often relatively expensive, the cost impact of utilizing such additives in the required amount can often be prohibitive.

"It would be desirable to provide optically clear IR radiation absorbing compositions comprising infrared absorbing particles dispersed in a binder in which the composition is transparent and colorless and exhibits excellent IR absorption in the wavelength range of .about.800 to 1400 nanometers."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "In certain respects, the present invention is directed to compositions of matter that are transparent and colorless. In some embodiments, the compositions of the present invention comprise: (a) a binder; and (b) no more than 500 parts per million, based on the total weight of the composition, of non-stoichiometric tungsten oxide particles having an average primary particle size of no more than 300 nanometers dispersed in the binder.

"In other embodiments, the compositions of the present invention comprise: (a) a binder; and (b) generally spherical non-stoichiometric tungsten oxide particles having an average primary particle size of no more than 300 nanometers dispersed in the binder. These compositions of the present invention produce films that are transparent and colorless and have a surface resistance of greater than 1.0.times.10.sup.10 .OMEGA./square.

"The present invention is also directed to, among other things, related injection stretch-blow molded articles and coated articles and methods."

For the URL and additional information on this patent, see: Adochio, William; Gaudet, Gregory T.; Rardon, Daniel E.; Still, Mark A.. Transparent, Colorless Infrared Radiation Absorbing Compositions Comprising Nanoparticles. U.S. Patent Number 8324300, filed January 20, 2010, and issued December 4, 2012. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=72&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=3573&f=G&l=50&co1=AND&d=PTXT&s1=20121204.PD.&OS=ISD/20121204&RS=ISD/20121204

Keywords for this news article include: Nanoparticle, Nanotechnology, Emerging Technologies, PPG Industries Ohio Inc.

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