A film for use in architectural applications (e.g. for roofs, walls or windows of buildings) comprises a polymeric material and an additive, wherein said polymeric material is a fluoropolymer and said additive is selected from titaniumnitride and tungsten oxide. Preferred polymeric materials may be ethylene chlorotrifluoroethylene (ECTFE) or an ethylene-tetrafluoroethylene copolymer (ETFE).

The present invention relates to a composition for fuel cell membranes and a process for the preparation thereof. In particular, the present invention relates to thermo-mechanically and chemically stable polymer electrolyte membranes which have been prepared without compromising proton conductivity by using multifunctional polydopamine and mechanically robust nanocellulose.

A composition comprising a mixture of fluoropolyether acids or salts having a number average value of about 800 to about 2500 g/mol. The amount of fluoropolyether acids or salt in the mixture having a molecular weight of not more than 500 g/mol is not more than 50 ppm by weight of the total amount of fluoropolyether acids or salts in the mixture. The amount of fluoropolyether acids or salts in the mixture having a molecular weight of 2500 g/mol or greater is not more than 40% by weight of the total amount of fluoropolyether acids or salts in the mixture. Preferably the fluoropolyether acids or salts comprise an anionic group selected from the group consisting of carboxylate, sulfonate, sulfonamide anion and phosphonate. Also disclosed is an aqueous dispersion polymerization process for fluoropolymer manufacture employing polymerization agent comprising the specified mixture of fluoropolyether acids or salts.

A polyimide porous film includes: a polyimide porous film body; and at least one of resin particles and a resin porous film, the at least one of the resin particles and the resin porous film adhering to one surface or both surfaces of the polyimide porous film body, and containing a fluorine-based resin or containing a fluorine-based resin and an acrylic resin.

A fluorine-containing dispersion is disclosed, the solid content of the fluorine-containing dispersion including a fluorine-containing polymer powder and polyimide. The fluorine-containing polymer powder has a mass ratio greater than 85% in the solid content, and the polyimide has a mass ratio less than 15% in the solid content. An average particle size of the fluorine-containing polymer powder is less than or equal to 3 μm. A method of preparing the fluorine-containing dispersion, and a fluorine-containing composite film made using the fluorine-containing dispersion are also disclosed.

A process for producing an ion exchange precursor resin membrane involves co-extruding an ion exchange precursor resin with an incompatible polymer to form a multilayer film having a layer of the ion exchange precursor resin supported on a layer of the incompatible polymer. The layer of incompatible polymer is then removed from the layer of ion exchange precursor resin to provide the ion exchange precursor resin membrane. The ion exchange precursor resin membrane may be converted to an ion exchange resin membrane by hydrolysis, and subsequent acidification if desired. Ion exchange resin membranes and ion exchange precursor resin membranes having a uniform thickness of 25 microns or less may be formed by the process.

A fluororesin film contains a fluororesin. The fluororesin contains two fluororesin species having different composition ratios of polymerized units. The fluororesin film has on at least one surface thereof a ten-point average roughness of 0.100 to 1.200 μm and an arithmetic average roughness of 0.010 to 0.050 μm, and the fluororesin film has a breakdown strength of 400 V/μm or higher.

Disclosed are copolymers which are useful in hydrophilically modifying porous fluoropolymer supports. An example of the copolymers is: ##STR00001##
Also disclosed are a method of preparing such copolymers, a method of modifying porous fluoropolymer surfaces, and hydrophilic fluoropolymer porous membranes prepared therefrom. Also disclosed is a method of filtering fluids by the use of the hydrophilic fluoropolymer porous membranes.

A composition for manufacturing a crosslinked ethylene tetrafluoroethylene (ETFE) copolymer with enhanced abrasion resistance and heat resistance is provided, the composition including ETFE, about 0.1-10% w/w of a metal oxide that effectively scavenges high levels of fluoride ions; and a crosslinking agent. Methods of using and making the composition are also provided.

To provide an ion exchange membrane for alkali chloride electrolysis which has high membrane strength and low membrane resistance, thereby capable of reducing the electrolysis voltage during alkali chloride electrolysis. In this ion exchange membrane (1) for alkali chloride electrolysis, a reinforcing material 20 formed by weaving reinforcing yarns 22 and sacrificial yarns 24 is disposed in a layer (S) 14, and layer (S) 14 has elution portions 28 formed by elution of at least portions of the sacrificial yarns 24. In a cross section perpendicular to reinforcing yarns of the warp, the average distance (d1) from the center of a reinforcing yarn 22 to the center of the adjacent reinforcing yarn 22, the total area (P) obtained by adding the cross-sectional area of an elution portion 28 and the cross-sectional area of a sacrificial yarn 24 remaining in the elution portion 28, the number (n) of elution portions between adjacent reinforcing yarns 22, and the ion exchange capacity of a layer (Sa) located on the most anode side in the layer (S) 14 during alkali chloride electrolysis, are controlled to be within specific ranges, respectively.