Abstract: A resin composite in which a fiber-reinforced resin material comprising fibers and a resin, and a resin expanded body are integrally laminated, wherein the resin expanded body has a hole opened at the interface with the fiber-reinforced resin material and resin of the fiber-reinforced resin material is caused to flow into the hole.

Abstract: A resin composite in which the flatness ratio of cells in a corner section of a core material is 20% or more is provided.

Abstract: High-density polyethylene mixed resin particles used as seed particles during seed polymerization, wherein said seed particles contain a mixed resin of 100 parts by weight of high-density polyethylene and 20 to 100 parts by weight of an ethylene copolymer; said high-density polyethylene has a density of 935 to 960 kg/m3 and a softening temperature of 115 to 130° C.; said ethylene copolymer is a copolymer of an ester-based monomer selected from an acrylic acid alkyl ester and an aliphatic saturated monocarboxylic acid vinyl, and etylene, contains 1 to 20% by weight of an ester-based monomer-derived component, and has a softening temperature of 75 to 110° C.; said acrylic acid alkyl ester is selected from methyl acrylate and ethyl acrylate; and said aliphatic saturated monocarboxylic acid vinyl is selected from vinyl acetate and vinyl propionate.

Abstract: A resin particle aggregate is the resin particle aggregate formed by aggregating a plurality of resin particles including a polymer of a vinyl monomer, includes 100 parts by mass of the resin particles and 1 to 5 parts by mass of a surfactant. The resin particles are cross-linked by a cross-linkable monomer in an amount of 10 to 50% by mass relative to the total mass of the resin particles, the resin particle aggregate contains an inorganic component in an amount of 0.5% by mass or less, the resin particles have a volume average particle diameter D1, particles contained in a dispersion liquid of the resin particle aggregate in water have a volume average particle diameter D2, and the ratio of D2/D1 is 15 or less.

Abstract: An antistatic sheet capable of improving working efficiency includes a laminated body formed by laminating a polymer gel on an antistatic-treated base sheet, the polymer gel comprising: a polymer matrix obtained by copolymerization-crosslinking of a polymerizable monomer having in its molecule at least one polymerizable carbon-carbon double bond and a crosslinkable monomer having in its molecule at least two polymerizable carbon-carbon double bonds; water having dissolved therein at least polyvinyl alcohol-type polymer; and a polyhydric alcohol other than polyvinyl alcohol-type polymer, wherein the water and the polyhydric alcohol are retained in the polymer matrix, the antistatic sheet having a ground resistance of 1.0×105? or more and 1.0×1012? or less, and a surface resistivity of 1.0×104?/? or more and 1.0×1012?/? or less as measured with respect to a surface thereof on a side of the base sheet.

Abstract: A temporary fixing material has a temporary fixing performance such that it can be used for temporarily fixing precision electronic parts made of glass, metals, etc. with ease, and which also can be easily removed from the adherend; an ability to remove contaminants before the temporary fixing; and an antistatic performance such that it can remove static electricity occurring at the time of removal thereof. The temporary fixing material includes a base substrate and a polymer gel, usable for temporarily fixing electronic parts during conveyance or processing thereof, a specific polymer gel is utilized which comprises: a polymer matrix obtained by copolymerization-crosslinking of a polymerizable monomer having in its molecule at least one polymerizable carbon-carbon double bond and a crosslinkable monomer having in its molecule at least two polymerizable carbon-carbon double bonds; and water having dissolved therein at least polyvinyl alcohol-type polymer, the water being retained in the polymer matrix.

Abstract: Carbon black-containing composite resin pre-expanded particles comprising 100 to 400 parts by mass of a polystyrene-based resin with respect to 100 parts by mass of a carbon black-containing polyolefin-based resin; having a carbon black content of 0.5 to 5.0% by mass and a bulk density of 0.015 to 0.25 g/cm3; and having an outermost layer of 30 to 80 pm after undergoing the following tests: (a) one of the carbon black-containing composite resin pre-expanded particles is sliced into a 1-mm slice in such a way that cross-section surfaces of cells are exposed on both surfaces of the slice; (b) the obtained slice is immersed in toluene at 25° C. for 24 hours to extract a polystyrene-based resin component as described above; (c) the cross-section surface of the slice is then subjected to magnified photographing by a microscope; (d) the obtained microscope image is observed.

Abstract: Polystyrene-based composite resin particles includes 100 to 500 parts by weight of a polystyrene-based resin with respect to 100 parts by weight of an ethylene-vinyl acetate copolymer resin. The polystyrene-based composite resin particles are impregnated with a volatile blowing agent and are pre-expanded to obtain pre-expanded particles; the obtained pre-expanded particles are immersed in tetrahydrofuran for 24 hours to obtain an extract A; and the pre-expanded particles are divided into two halves through the center to prepare halved particles, and the halved particles are immersed in tetrahydrofuran for 24 hours to obtain an extract B; and the obtained extract A and extract B are subjected to a GPC (gel permeation chromatography) measurement and obtain the following results: the polystyrene-based resin having a weight-average molecular weight (Mw) of 100,000 to 500,000 gives a peak obtained from chromatograms for the extract A and for the extract B.

Abstract: Composite resin particles including a polypropylene-based resin and a polystyrene-based resin, wherein the content of the polystyrene-based resin is 100 to 400 parts by mass with respect to 100 parts by mass of the polypropylene-based resin, a surface area section is in a state in which the polystyrene-based resin with a particle diameter of 0.3 ?m or less is dispersed in the polypropylene-based resin, an outermost surface area section is in a state in which the polystyrene-based resin with a particle diameter of 0.3 to 1.5 ?m is dispersed in the polypropylene-based resin, and the ratio of the absorbance derived from the polystyrene-based resin and the absorbance derived from the polypropylene-based resin obtained from an infrared absorption spectrum of the surface of the composite resin particles is 0.5 to 2.5.

Abstract: A composite resin expanded molded article comprising: 100 parts by mass of an ethylene-vinyl acetate copolymer; and 100 to 400 parts by mass of a polystyrene-based resin, wherein the composite resin expanded molded article has an average cell diameter D of 100 to 500 ?m and an average cell membrane thickness T of 1 to 5 ?m.

Abstract: Provided is a plastic foamed article to be attached to an attaching target having a rod-shaped attaching portion having a radial direction, the plastic foamed article including a holding portion for holding the attaching portion in the radial direction in a state attached to the attaching target, the holding portion including a pair of opposite surfaces facing each other for holding the attaching portion between the pair of opposite surfaces and a protrusion provided on one of the pair of opposite surfaces, and at least a part of the protrusion is configured to be elastically deformed by the attaching portion in a state in which the attaching portion is held between the pair of opposite surfaces.

Abstract: Modified polystyrene cross-linked resin particles in which polyacrylic acid ester-based resin fine particles having an average particle diameter in the range of 30 to 1,000 nm are dispersed in polystyrene-based resin particles, wherein the content of gel component fraction insoluble to toluene when about 1 g of the modified polystyrene-based cross-linked resin particles is dissolved in 50 ml of toluene at 25° C. is in the range of from 5 to 25% and the gel component shows a degree of swelling in the range of from 10 to 20 in toluene at 25° C.

Abstract: Disclosed are porous resin particles which contain a polymer of a monomer mixture of a mono(meth)acrylate-based monomer and a polyfunctional vinyl-based monomer. The mono(meth)acrylate-based monomer contains an ethylenic unsaturated group only in a (meth)acrylic acid residue, a hydroxyl group in an alcohol residue, and at least one of an ether group and an ester group in an alcohol residue. The polyfunctional vinyl-based monomer contains two or more ethylenic unsaturated groups. The porous resin particles have a water absorption value of from more than 400 ml to 700 ml per 100 g of the particles and an oil absorption value of from more than 400 ml to 700 ml per 100 g of the particles.

Abstract: A method for producing expanded particles, the method comprising dividing at least two or more times expandable particles including a base resin, which is a composite resin of a polyolefin-based resin and a polystyrene-based resin, and a blowing agent and subjecting each to an expansion step, wherein the expandable particles are subjected to the expansion step directly after being held in a pressurized vessel maintained at 0.1 to 0.4 MPa and ?20 to 30° C.

Abstract: The present invention provides resin particles including polymer obtained of a monomer mixture containing a monofunctional (meth)acrylic ester monomer, a monomer represented by a general formula (I); CH2?C(R1)—COO—(CH2CH2O)n—CO—C(R1)?CH2??(I) where R1 is a hydrogen or a methyl group and n is an integer from 1 to 4, and a monomer represented by a general formula (II); CH2?C(R2)—COO—(CH2CH2O)m—CO—C(R2)?CH2??(II) where R2 is a hydrogen or a methyl group and m is an integer from 5 to 15. The resin particles have a volume average particle diameter of 5 to 50 ?m, a recovery rate of 15% or more to less than 30%, and a compression strength (MPa) that provides a multiplication product in the range of 24.5 to 60.0 obtained by multiplying the compression strength and the volume average particle diameter (?m).

Abstract: The present invention provides porous resin particles made of a polymer of a monomer mixture, wherein the monomer mixture contains, as monomers, at least methyl methacrylate and a (meth)acrylic-based cross-linkable monomer, a content of the methyl methacrylate in the monomer mixture is 1 to 50% by weight, a content of the (meth)acrylic-based cross-linkable monomer in the monomer mixture is 50 to 99% by weight, the porous resin particles have a specific surface area of 130 to 180 m2/g, a pore volume of 0.3 to 0.7 ml/g, and an average pore size of 13 to 16 nm, an amount of unreacted methyl methacrylate remaining in the porous resin particles is 20 ppm or less, and the porous resin particles have a thermal decomposition starting temperature of 260° C. or more.

Abstract: Disclosed are non-spherical resin particles that allow for improvement of light diffusion, light reflection, and other related properties, and a manufacturing method thereof. The particles have a circular outline when viewed from a direction in which a maximum projected area is produced and a non-circular outline when viewed from a direction in which a minimum projected area is produced, The particles comprise first and second, different resin components (1) and (2), with the second resin component (2) residing locally near the surface of the non-spherical resin particles. The method of manufacturing non-spherical resin particles involves either allowing particles of a resin to absorb a vinyl-based polymerizable monomer contained in an aqueous emulsion followed by polymerization of the absorbed monomer or dissolving a resin in a vinyl-based polymerizable monomer followed by polymerization of the obtained solution in an aqueous medium.

Abstract: An adhesive hydrogel contains: a polymer matrix of a copolymer of a monofunctional monomer and a crosslinking monomer (a); another polymer component; water; and a polyhydric alcohol, wherein: either a structural unit derived from the monofunctional monomer contained in the polymer matrix or the other polymer component or both contain a structural unit derived from at least one compound (b) selected from the group consisting of ethylenically unsaturated carboxylic acids, ethylenically unsaturated carboxylic acid salts, and ethylenically unsaturated carboxylic acid derivatives having a hydroxyl group, an acid group, a salt thereof, an amino group, and/or an ammonium group; and the other polymer component contains a polymer compound (c) with a side chain having an oxyalkylene group or a polyoxyalkylene group.

Abstract: Modified polystyrene-based resin particles comprising polyacrylic acid ester-based resin microparticles having an average particle diameter in the range of from 30 to 1,000 nm being dispersed in polystyrene-based resin particles, such that the polyacrylic acid ester-based resin microparticles are present (1) in the area ratio of from 0.1 to 15% in a surface area, which includes areas up to 20 ?m from the surface of each resin particle, and (2) present in the area ratio of from 11 to 50% in the inner area, which includes the area between the center of each resin particle and an point 30% of the radius from the center of each particle.

Abstract: Expanded composite polystyrene-based resin particles having a plurality of cells and cell membranes separating the plurality of cells, said cell membranes including a polystyrene-based resin forming a continuous phase and polyacrylic acid alkyl ester-based resin fine particles dispersed in said continuous phase to form a dispersed phase, and said polystyrene-based resin being complexed with said polyacrylic acid alkyl ester-based resin fine particles, wherein said dispersed phase is present in the form of a plurality of layers in a cell membrane thickness direction in a cell membrane cross-section of said expanded composite polystyrene-based resin particles.