The present disclosure is directed to provide polyamide-based resin pre-expanded particles which can serve as a raw material of a polyamide-based resin foam shaped product having an excellent mechanical strength. Polyamide-based resin pre-expanded particles of the present disclosure contain a polyamide-based resin. The polyamide-based resin pre-expanded particles have an expansion ratio of 1.0 or more, wherein the expansion ratio is a ratio (ρ1/ρ2) of a density ρ1 (g/cm.sup.3) to a density ρ2 (g/cm.sup.3) after being pressurized with air at 0.9 MPa and then heated for 30 seconds with saturated steam at a temperature higher than a thermal fusion temperature by 5° C.

The present invention provides a two-component foamable silicone composition comprising: a component A comprising (a) at least one polyorganosiloxane having at least one vinyl group, (b) at least one chemical blowing agent, and (c) at least one catalyst; and a component B comprising (d) at least one polyorganosiloxane having at least one vinyl group, and (e) at least one polyorganosiloxane having at least one —SiH group, and at least one expandable graphite in an amount of less than 10% by weight, based on the total weight of the component B, which exhibits excellent flame retardancy, good sealing performance, high compression rate, low gasket density, good dispensing continuity and good cell structure. The present invention also provides a preparing method and use thereof.

A masterbatch composition suitable for use as a flame retardant in extruded polymer foams, and process for manufacturing the same, and extruded foams containing same; the composition comprising: (a) 20 to 40 parts by weight base resin comprising styrene homopolymer or copolymer; (b) 1 to 16 parts by weight acid scavenger comprising an epoxy-based compound; (c) 2 to 6 parts by weight antioxidant comprising an alkyl or aryl phosphite; and (d) 45 to 60 parts by weight flame retardant comprising a non-hexabromocyclododecane (HBCD) brominated polymer or copolymer, wherein the amounts of (a), (b), (c), and (d) total 100 parts by weight; and (e) 0.6 to 10 parts by weight of pH moderator, based on 100 parts of (a) base resin plus (e) water soluble pH moderator.

Provided are a porous film having excellent surface smoothness and a method for producing the same. The surface roughness of a porous film of polyvinylidene fluoride, polyethersulfone, polyimide and/or polyamide-imide is Ra 30,000 Å or less. The opening diameter of the porous film is preferably from 100 nm to 5000 nm. The method for producing a porous film preferably includes a step for kneading a varnish containing fine particles and at least one resin selected from the group consisting of polyvinylidene fluoride, polyether sulfone, polyamic acid, polyimide, polyamide-imide precursor, and polyamide-imide. The varnish preferably has a viscosity at 25° C. of 0.1-3 Pa.Math.s, a solids fraction concentration of 10-50 mass %, and a fine particle average particle size of 10-5000 nm.

A liquid crystalline polymer composition for foam molding using a supercritical fluid as a foaming agent. The liquid crystalline polymer composition includes a liquid crystalline polymer and a scale-like inorganic filler, in which a content of the scale-like inorganic filler is 1 part by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the liquid crystalline polymer composition.

A method for producing an expanded rigid foam with sealed pores includes at least the following steps: a) a mixture is prepared containing at least: an anionic polymer suited for ionotropic gelation; a foaming agent; a source of multivalent cations, said multivalent cations not being released in the mixture a); and a solvent; b) the mixture is stirred so as to obtain a foam; c) a compound capable of releasing protons in a sufficient amount to release said multivalent cations is added to the foam such that the anionic polymer gels ionotropically; d) the foam is dried. A foam is obtained in this manner and an object (for example a package, a heat-insulating or flame-retardant material) is made from this foam.

Method of preparing a porous material includes preparing a mixture of from about 10 to about 30% by mass of a matrix material, from about 20 to about 60% by mass of a plurality of particles, from about 20 to about 60% by mass of a porogen, and from about 1 to about 10% by mass of an interfacial compatibilizer. The matrix material and the porogen may be selected so as to be phase separated in the mixture. The method may further include placing the mixture into a form; initiating a solidification of the matrix material during which the porogen remains nonvolatile and the matrix material and the porogen remain phase separated; and removing at least a portion of the porogen to obtain the porous material. Porous materials produced by the methods. Microfluidic channels produced by the methods.

A foamed sheet including: a polylactic acid; and a filler, wherein the foamed sheet has a compressive stress of 0.2 Mpa or less when the cushioning coefficient of the foamed sheet is 10 or less; and wherein the foamed sheet has a puncture strength of 2 N or more when the sheet thickness of the foamed sheet is 2 mm.

The polyolefin resin foam sheet is a polyolefin resin foam sheet having a plurality of cells in an inside thereof, wherein the 50% compressive strength is 120 kPa or less; the MD elongation percentage is 400% or less; and the TD elongation percentage is 200% or less.

Provided is a separator for a non-aqueous secondary battery, the separator contains a porous substrate, and a heat resistant porous layer that is provided on one side or on both sides of the porous substrate, and that contains a heat resistant resin and barium sulfate particles, in which an average primary particle size of the barium sulfate particles contained in the heat resistant porous layer is from 0.01 μm to less than 0.30 μm, and in which a volume ratio of the barium sulfate particles in a solid content portion of the heat resistant porous layer is from 5% by volume to less than 30% by volume.