The invention provides a hydrophilizing agent which is to be added to a polymer having a large contact angle to produce a porous polymer film that has a small contact angle and that can maintain this small contact angle even after 168-hour contact with an aqueous sodium hypochlorite solution. The hydrophilizing agent contains a fluoropolymer having a contact angle of 50 or smaller and a weight reduction rate of 7% or lower.

The present invention relates to a processing aid of a non-fluorinated melt-processable polymer and a masterbatch for a processing aid, features the inclusion of a processing aid comprising a fluoropolymer forming clustered secondary particles each having a particle size of 2 m to 2 mm and being a combination of primary fluoropolymer particles each having a diameter of 0.02 m to 0.5 m, and may accelerate the elimination of melt fracture despite the omission of an interfacial agent and decrease extrusion load upon process to thereby enhance productability.

Disclosed is a method for making a polymer or copolymer aerogel product by forming an aerogel polymer or copolymer solution in the presence of a polymer or copolymer catalyst and solvent therefor. The aerogel polymer or copolymer solution is drained onto a spinning disk or cup. The solvent is removed under aerogel forming conditions to produce the aerogel fiber web or yarn product.

Fluoroelastomer crosslinkable composition comprising fluoroelastomer (a) and cross-linking agent (b), wherein fluoroelastomer (a) contains vinylidene fluoride unit, and cross-linking agent (b) is a compound (b1) having a monocyclic aromatic ring (Ar-1), 2 or more hydroxy groups directly bonded to carbon atoms constituting the aromatic ring (Ar-1), and a substituent () directly bonded to a carbon atom constituting the aromatic ring (Ar-1) for which at least one of the Hammett's substituent constants, m and p, is a value of 0.03 or more (excluding a halogen atom, an amino group, a sulfanyl group, an acid group, hydroxy group, and a group containing these groups, and an aromatic ring-containing group in which a group for which at least one of the Hammett's substituent constants is a value of 0.03 or more is directly bonded to a carbon atom constituting the aromatic ring); and/or a salt of the compound (b1) with an onium compound.

To provide a fluorinated resin composition which is capable of forming a resin film excellent in moist heat resistance and solar reflectance. The fluorinated resin composition comprises composite particles, a fluorinated polymer and a liquid medium, wherein the composite particles are a composite having a part or whole of the surface of aluminum particles coated with at least one member selected from the group consisting of an acrylic resin and silica; the total coating amount of the acrylic resin and silica is from 6 to 25 parts by mass per 100 parts by mass of the aluminum particles; and the water surface diffusion area is from 14,000 to 27,000 cm.sup.2/g.

In an aspect, a method of making a composition, comprising forming a solvent mixture comprising a polymer and a solvent; precipitating the solvent mixture with a non-solvent to form the composition comprising the filler in a fibrillated polymer matrix, wherein the composition is in the form of a particulate and at least one of the solvent and the non-solvent comprises a filler; and separating the composition from the solvent and the non-solvent to isolate the composition. In another aspect, a porous material wherein the filler particles are mechanically bonded together by the polymer and wherein the polymer is present as filaments adhering to and connecting the filler particles across interstitial spaces between the filler particles. In another aspect, a precipitated polymer solution produced by a phase inversion where the majority of the liquids can be mechanically removed.