Methods of making and using optical film, light-diffusing film

US7369192B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Nickey Ambrose · Greenwood, US
• Grant Hay · Niskayuna, US
• Eugene David Herrmann · Clifton Park, US
• Karkala Arun Kumar · Evansville, US
• Philip Peters · Greenwood, US
• Joe Riello · Pittsfield, US

Key dates

• Filing date: Jun 7, 2007
• Grant date: May 6, 2008
• Expiry date: Jun 7, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/0051
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An embodiment of a method of making an optical film comprises heating the optical film comprising greater than or equal to 80 wt. % polycarbonate to a sufficient temperature to stretch the optical film, wherein the weight percent is based on a total weight of the optical film; and stretching the optical film. A resulting stretched optical film has a linear CTE measured in a direction parallel to a stretching direction of less than or equal to 50×10−6 cm/cm/° C.