Optical films cast from styrenic fluoropolymer solutions
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United States of America Patent
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Nov 18, 2014
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May 1, 2012
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Mar 29, 2007
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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:
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