The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 2009
Filed:
Aug. 03, 2004
Michael K. Gerlach, Brookline, MA (US);
Gerald N. Nkwantah, Brockton, MA (US);
Jonathan M. Mack, Boylston, MA (US);
Pradnya V. Nagarkar, Newton, MA (US);
Philip J. Ralli, Sudbury, MA (US);
Michael K. Gerlach, Brookline, MA (US);
Gerald N. Nkwantah, Brockton, MA (US);
Jonathan M. Mack, Boylston, MA (US);
Pradnya V. Nagarkar, Newton, MA (US);
Philip J. Ralli, Sudbury, MA (US);
Seiko Epson Corporation, Tokyo, JP;
Abstract
An improved method of forming an intrinsic polarizer, referred to as a K-type polarizer, includes stretching a polymeric film a first stretching step. The polymeric film comprises a hydroxylated linear polymer which is converted after the first stretching step to form dichroic, copolymer polyvinylene blocks aligned in the polymeric film. The polymeric film is stretched in a second stretching step while converting the hydroxylated linear polymer. This method produces an improved K-type polarizer with excellent polarizing and color characteristics. For example, the dichroic ratio is higher than 100, the color shift for light passed through the polarizer in a crossed configuration is low, and the absorption of light in the blue region of the visible spectrum is more than one half of the absorption for light in the middle of the visible spectrum.