3m Innovative Properties Company

Zhongxing Zhang

Zai-Ming Qiu

Richard M Flynn

Michael J Parent

Daniel R Vitcak

George G I Moore

William M Lamanna

Patricia M Savu

Michael G Costello

Fred E Behr

Naiyong Jing

John G Owens

Richard M Minday

Paul E Rivers

Novel aqueous, acid etch solutions comprising a fluorinated surfactant are provided. The etch solutions are used with a wide variety of substrates, for example, in the etching of silicon oxide-containing substrates.

Fluorinated surfactants for aqueous acid etch solutions

Perfluoro-4-methyl-2-pentene containing the undesirable perfluoro-2-methyl-2-pentene may be purified by contacting the mixture with at least a stoichiometric equivalent of an aqueous inorganic base (relative to the perfluoro-2-methyl-2-pentene), in the presence of a polar solvent.

Process for purifying hexafluoropropene dimers

The present invention relates to optical elements comprising fluorochemical surface treatments having the general structure Rf-[G](CH)&#x2014;X wherein Rf is a fluorinated alkyl group, G is a divalent linking group selected from oxygen (&#x2014;O&#x2014;) and sulfonamido (&#x2014;SOR&#x2014;), m is an integer ranging from 0 to 1, n is an integer ranging from 1 to 24, and X is polar group or polar group containing radical. The invention further relates to materials such as retroreflective sheetings, pavement markings and beaded projection screens comprising a binder and the surface treated optical elements.

Optical elements comprising fluorochemical surface treatment

A method of removing hexafluoropropylene dimers (&ldquo;HFP dimers&rdquo;), dimer hydrides and other oligomers from a fluid is described. The method comprises heating the fluid to isomerize the HFP dimers to the thermodynamic isomer, and contacting the fluid with a tertiary amine (or salts thereof) to form a hexafluoropropylene dimer&mdash;tertiary amine adduct. The method may further comprise the step of separating the dimer adducts from the reaction mixture.

Method of removing hexafluoropropylene dimers

Fire extinguishing compositions and methods for extinguishing, controlling, or preventing fires are described wherein the extinguishing agent is a fluorinated ketone having up to two hydrogen atoms, alone, or in admixture with a co-extinguishing agent selected from hydrofluorocarbons, hydrochlorofluorocarbons, perfluorocarbons, perfluoropolyethers, hydrofluoroethers, hydrofluoropolyethers, chlorofluorocarbons, bromofluorocarbons, bromochlorofluorocarbons, iodofluorocarbons, hydrobromofluorocarbons, and mixtures thereof.

Use of fluorinated ketones in fire extinguishing compositions

A method for obtaining purified perfluorocarbon compositions, and purified compositions containing such perfluorocarbons.

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Woodbury, MN, United States of America

Zhongxing Zhang