Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.

Polymer, polymer microfiber, polymer nanofiber and applications including filter structures

Described are fluorochemical surfactants derived from nonafluorobutanesulfonyl fluoride that contain polyalkyleneoxy side chains and may be copolymerized with acrylic acid or methacrylic acid to form polyacrylates or polymethacrylates. The surfactants surprisingly lower the surface tension of water and other liquids in the same or similar low values achieved by premier surfactants such as those derived from perfluorooctane sulfonyl fluoride.

Fluorochemical sulfonamide surfactants

Thermoplastic bicomponent binder fiber can be combined with other media, fibers and other filtration components to form a thermally bonded filtration media. The filtration media can be used in filter units. Such filter units can be placed in the stream of a mobile fluid and can remove a particular load from the mobile stream. The unique combination of media fiber, bicomponent binder fiber and other filtration additives and components provide a filtration media having unique properties in filtration applications.

Filter medium and structure

Fluorochemical urethane compositions comprising one or more compounds or oligomers having at least on fluorine-containing repeatable unit and at least one fluorine-containing terminal group are described. The compositions are useful as coatings or incorporated as melt additives. The fluorochemical compositions impart oil and water repellency to the substrate. In other aspects, this invention relates to processes for imparting oil and water repellency characteristics to substrates and articles.

Water- and oil-repellency imparting ester oligomers comprising perfluoroalkyl moieties

A sound absorptive multilayer composite having an air-impermeable barrier, an air-permeable reinforcing core having an airflow resistance of at least about 100 mks Rayls and a thickness at least about ⅓ the final composite thickness, an air-permeable open cell foam or fibrous pad having an airflow resistance less than about 2000 mks Rayls and a thickness at least about 1/10 the final composite thickness and a semipermeable airflow-resistive membrane having an airflow resistance of about 500 to about 4000 mks Rayls can provide improved acoustic performance. For example, existing vehicular headliner designs may be improved by adding a properly chosen and properly positioned semipermeable airflow-resistive membrane, a properly chosen and properly positioned air-impermeable barrier, or a properly chosen and properly positioned open cell foam layer.

Sound absorptive multilayer composite

Fluorocarbon acrylate and methacrylate esters and polymers

Fluorocarbonsulfonamidoalkanols and sulfates thereof

Perfluoro amine compounds and quaternary derivatives

Perfluoroalkyl acrylate polymers and process of producing a latex thereof

The invention includes a polymer of a vinyl or allyl fluorocarbon ester of the formula: Rf.SO2.N(R1)R.COOCH=CH2 or Rf.SO2.N(R1)R.COOCH2CH=CH2 where Rf is a perfluoroalkyl group of 4 to 12 carbon atoms, R1 is hydrogen or an alkyl group of 1 to 6 carbon atoms and R is an alkylene bridging group of 1 to 12 carbon atoms. The vinyl and allyl esters may be bulk, solution, e.g. toluene, or emulsion polymerized using peroxide catalysts, e.g. acetyl or benzoyl peroxides, either alone or together or with other ethylenic monomers such as maleic anhydride, acrylonitrile, vinyl chloride, vinyl acetate, vinyl silicones, styrene, methyl acrylate, methyl methacrylate, ethylene, isoprene and butadiene. The polymer may be modified by the use of plasticizers, carbon black, zinc oxide or by copolymerization with polyfunctional compounds which cause cross-linking. Examples describe the polymerization of N-ethyl- and N-methyl- N-perfluoro-octanesulphonyl glycine vinyl ester and the copolymeriation of N-methyl-N-perfluoro-octanesulphonyl-11-amino-undecanoic acid allyl ester and maleic anhydride. Specifications 758,467 and 857,335 are referred to.ALSO:The invention comprises vinyl and allyl esters of a perfluoroalkanesulphonamido alkylene-monocarboxylic acid having the formula: Rf SO2 N(R1)R-COOCH=CH2 or RfSO2N(R1)R-COOCH2-CH=CH2 where Rf is a perfluoroalkyl group containing 4 to 12 carbon atoms, R is an alkylene bridging group containing 1 to 12 carbon atoms and R1 is hydrogen or an alkyl group containing 1 to 6 carbon atoms. They may be prepared by esterifying the corresponding acid or prepared directly by condensing an alkali metal salt of a perfluoroalkylsulphonamide with a vinyl or alkyl ester of an omega halogenated carboxylic acid. These esters may be polymerised or copolymerised with other ethylenic compounds (see Group IV(a)) to yield a polymer that, when coated on the surface of an article, gives both a water and oil repellent surface. The monomeric esters may be used in a similar manner. In Examples (1) the sodium salt of N-ethyl-perfluoro-octanesulphonamide is condensed with vinyl chloroacetate. (2) the N-methylcompound is similarly used. (3) N-methyl-N-perfluoro-octanesulphonyl-11-amino-undecanoic acid is esterified with vinyl acetate in the presence of sulphuric acid and mercuric acetate. (4) N-perfluoro-octanesulphonyl glycine is esterified with allyl alcohol in the presence of betanaphthalene sulphonic acid. (5) N-methyl-N-perfluoro-octanesulphonyl - 11 - amino - undecanoic acid is similarly esterified. Specifications 758,467 and 857,335 are referred to.

Arthur H Ahlbrecht

Papers

Fluorocarbon acrylate and methacrylate esters and polymers

Fluorocarbonsulfonamidoalkanols and sulfates thereof

Perfluoro amine compounds and quaternary derivatives

Perfluoroalkyl acrylate polymers and process of producing a latex thereof

Fluorocarbon vinyl-type esters and polymers