The Dow Chemical Company

Dow Global Technolgoies LLC

William C Sumner

Pak-Wing Steve Chum

Leonardo C Lopez

Kevin E Howard

Shaofu Wu

Xuming Chen

Philip J Brondsema

Robert A Koster

Gale G Hoyer

William G Kozak

Willis J Pennington

Susan E Vilmer

The fluoropolymer compositions of the present invention generally incorporate ingredients comprising one or more fluoropolymers, an ultraviolet light protection component (hereinafter UV protection component), and optionally one or more additional ingredients if desired. The UV protection component includes a combination of at least one hindered tertiary amine (HTA) compound having a certain structure and a weight average molecular weight of at least 1000. This tertiary amine is used in combination with at least one organic, UV light absorbing compound (UVLA compound) having a weight average molecular weight greater than 500. When the HTA compound and the UVLA compound are selected according to principles of the present invention, the UV protection component provides fluoropolymer compositions with significantly improved weatherability characteristics for protecting underlying materials, features, structures, components, and/or the like. In particular, fluoropolymer compositions incorporating the UV protection component of the present invention have unexpectedly improved ability to resist blackening, coloration, or other de gradation that may be caused by UV exposure. As a consequence, devices protected by these compositions would be expected to have dramatically improved service life. The compositions have a wide range of uses but are particularly useful for forming protective layers in optoelectronic devices.

Optoelectronic devices incorporating fluoropolymer compositions for protection

Ortho-aromatic diaryl ethers, such as o-biphenylyl phenyl ether, are hydrolyzed to corresponding phenolic compounds, such as o-phenylphenol and phenol, when contacted with water in the presence of ceria or thoria at a temperature of between about 250.degree. C. and 700.degree. C.

Process for hydrolysis of ortho-aromatic di-aryl ethers

A method removing water from aqueous alkali metal hydroxide solutions by contacting the solution with an organic liquid at elevated temperatures and pressures to form an organic liquid-water phase and a hydroxide solution phase and thereafter separating the organic water phase from the hydroxide solution phase.

Method of removing water from alkali metal hydroxide solutions

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Midland, MI, United States of America

William C Sumner