The objective of the present invention is to provide a mold-release film that docs not contaminate the mold or the formed body. This invention provides a mold-release film comprising a base material layer formed from a thermoplastic resin, and a surface layer formed from a resin composition layered on at least one surface of the base material layer. The mold-release film has a trouser tear strength, conforming to JIS K 7128-1, of 5 N/mm or stronger. The resin composition has a peel strength of 15 mN/30 mm or weaker, as measured at 175° C. in accordance with JIS Z0237. The resin composition has an elongation at break of 70% or greater, as measured at 175° C. in accordance with JIS K 7127.

Disclosed is a composition comprising a PVDF copolymer where at least one comonomer is selected from Hexafluoropropene, 2,3,3,3-tetrafluoropropylene, 3,3,3-trifluoropropene, from 0.005-5% of one or more inorganic or polymeric nucleating additives and 0.01-20% of one or more dispersing agents having reduced haze. Also disclosed is a method of preparing the composition.

Provided are a polymer film including a particle A having a constricted structure and a polymer B; a laminate including the polymer film and a metal layer or metal wire disposed on at least one surface of the polymer film; and a method of producing the polymer film.

A coating material of the present invention is a coating material containing: a fluorine-containing polymer having at least one of an iodine atom and a bromine atom; and a solvent, wherein a storage elastic modulus G′ of the fluorine-containing polymer is less than 360 kPa, and a total light transmittance of a mixed liquid obtained by mixing and stirring the fluorine-containing polymer and the solvent contained in the coating material is 1.0% or more, the mixed liquid being left to stand for 3 days, stirred again, and left to stand for 30 minutes to measure the total light transmittance.

An expanded beads molded article containing a block copolymer of a polyethylene block and an ethylene-α-olefin copolymer block and having a density of 150 kg/m.sup.3 or more and 500 kg/m.sup.3 or less and a tensile strength of 0.5 MPa or more.

A porous polyimide film is provided to suppress an increase in a dielectric loss tangent even when immersed in water. In the porous polyimide film, a difference between a dielectric loss tangent T1 after being left to stand for 24 hours under an atmosphere of 25° C. and relative humidity of 50% and a dielectric loss tangent T2 after immersion in water for 24 hours under an atmosphere of 25° C. is 0.0030 or less.

A method for producing a fluoropolymer powder including (A1) adding, to a fluoropolymer aqueous dispersion obtained by polymerization using a carboxylic acid type hydrocarbon surfactant, and an acid to adjust a pH to 4.0 or less and cause coagulation to thereby obtain a wet fluoropolymer powder containing a fluorine-containing compound represented by the following general formula (1A), and (B1) heat-treating the wet fluoropolymer powder at a temperature higher than 150° C. and lower than 240° C.: General Formula (1A): H—(CF.sub.2).sub.m—COOH wherein m is 3 to 19.

Provided in this patent disclosure are two types of novel fluoro-monomers that can be polymerized for the fabrication of ion-exchange fluoropolymers. In addition, new proton-conductive zirconium-perfluorophosphonic acid fluoropolymer membranes that can reduce metal crossovers in redox flow batteries are also provided.

Expanded polypropylene beads are prepared from composite particles using a high-temperature and high-pressure kettle type foaming method. The composite particles include a core layer and a skin layer. The core layer includes one or more of the following components, for example in percentage by mass: 20-40% of polypropylene A, 60-80% of polypropylene B, 0-20% of polypropylene C and 0-10% of a thermal-conductive additive. The skin layer includes one or more of the following components, for example in percentage by mass: 40-80% of polypropylene D and 20-60% of polypropylene E. The composite particles are of a multi-layer structure with the skin layer covering the core layer. A resin of the skin layer is easy to sinter at low temperature and in compatibility with a main substrate resin of the core layer. The core layer resin adopts a selected mixture, which promotes molding expansibility.

A foam and a foaming composition are provided. The foam includes a composite material and a plurality of foam cells, wherein the foam cells are disposed in the composite material. The composite material includes a modified sulfur-containing polymer and a fluorine-containing polymer fiber, wherein a degree of orientation as defined by the ratio I.sub.110/I.sub.200 is from 1.0 to 1.3, wherein I.sub.110 is the X-ray diffraction peak intensity of (110) planes of the modified sulfur-containing polymer and I.sub.200 is the X-ray diffraction peak intensity of (200) planes of the modified sulfur-containing polymer.