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Infrared-IR-absorbing-polyvinyl-butyral-composition-sheet-thereof-and-laminate-containing-the-same

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Infrared (IR) absorbing polyvinyl butyral composition, sheet thereof and laminate containing the same

Details

Inventors: Fisher, W. Keith;
Assignee: Solutia, Inc. (St. Louis, MO)
Primary Examiner: Reddick; Judy M.
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto

A polyvinyl butyral composition is disclosed which is comprised of polyvinyl butyral resin containing an IR absorbing effective amount of lanthanum hexaboride or a mixture of lanthanum hexaboride and at least one of tin oxide and antimony tin oxide. Also disclosed are a sheet of the IR absorbing polyvinyl butyral and a glass laminate having the IR absorbing polyvinyl butyral sheet disposed between two sheets of glass.

DETAILED DESCRIPTION This invention is directed to a polyvinyl butyral composition comprising polyvinyl butyral resin containing an IR absorbing effective amount of lanthanum hexaboride.
Preferably the polyvinyl butyral resin contains an IR absorbing effective amount of a mixture of lanthanum hexaboride and at least one of indium tin oxide and antimony tin oxide.
The lanthanum hexaboride and any indium tin oxide and/or antimony tin oxide are present as fine particles, i.
e.
, having a particle size that will not interfere with the visual transmission through a sheet comprised of such an IR absorbing polyvinyl butyral.
This invention is also directed to a sheet formed from the polyvinyl butyral composition of this invention as well as a glass laminate comprised of two sheets of glass having the sheet of this invention disposed therebetween.
The sheet formed from the polyvinyl butyral composition of this invention may be used with heat absorbing glass to form a laminate with optimum solar absorbing properties.
The glass laminate of this invention is particularly efficient at reducing IR transmission without degradation of the efficiency over time.

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