Optical films cast from styrenic fluoropolymer solutions

US8889043B2 · kind B2 · utility

Assignee

• Akron Polymer Systems, Inc. · US

Inventors

• Bin Wang · Beijing, CN
• Thauming Kuo · Kingsport, US
• Douglas Stephens McWilliams · Kingsport, US
• Frank W. Harris · Akron, US
• Ted Calvin Germroth · Kingsport, US
• Jiaokai Jing · Uniontown, US
• Dong Zhang · Uniontown, US
• Xiaoliang Zheng · Hudson, US

Key dates

• Filing date: May 1, 2012
• Grant date: Nov 18, 2014
• Expiry date: May 1, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/3083
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method for casting a styrenic fluoropolymer film on a substrate includes preparing a polymer solution by dissolving the fluoropolymer in a solvent or solvent blend whose Hansen solubility parameters (HSPs. MPa1/2) satisfy the following relations: |SPb−SPp|<5, |SPb−SPs|<4, |SPb(H)−SPp(H)|<7, and 2<|SPb(H)−SPs(H)|<10 wherein SPb, SPp, SPs, are the total Hansen solubility parameters of solvent/solvent blend, fluoropolymer, and substrate, respectively; SPb(H), SPp(H), and, SPs(H) are the hydrogen-bond Hansen solubility parameters of solvent/solvent blend, fluoropolymer, and substrate, respectively; wherein the fluoropolymer comprises a moiety of:wherein R1, R2, and R3 are each independently hydrogen atoms, alkyl groups, substituted alkyl groups, or halogens, wherein at least one of R1, R2, and R3 is a fluorine atom, and wherein R is each independently a substituent on the styrenic ring, n is an integer from 0 to 5 representing the number of the substituents on the styrenic ring.