Abstract: The present invention provides vinyl-based resin particles capable of easily smoothing the surface of a thermosetting resin film when the particles are used as a pore-forming material for a thermosetting resin. Specifically, the present invention provides vinyl-based resin particles for use in making a thermosetting resin porous, the particles having a temperature of 230° C. or higher and lower than 300° C. at 10% mass loss when heated at a rate of 10° C./min in an air atmosphere, and the particles having a mass loss percentage of 85 to 100% after being heated at 350° C. for 5 hours in an air atmosphere.

Abstract: Biodegradable resin particles including a polyhydroxy alkanoate. In the biodegradable resin particles, an amount of a Ca component present in the particles is 10 to 10,000 ppm, the biodegradable resin particles have a volume average particle diameter of 2 to 50 ?m, the biodegradable resin particles have a BET specific surface area of 0.8 to 10 m2/g, and the biodegradable resin particles have a linseed oil absorption of 50 to 300 ml/100 g. The resin particles of the present invention can be suitably used by being included in an external preparation, such as a cosmetic or a quasi-drug.

Abstract: Biodegradable resin particles including a recessed portion in a surface of the particles; and a hollow portion within the particles. The biodegradable resin particles of the present invention can be used in external preparations, such as cosmetics and quasi-drugs; coating materials, such as powder coating compositions and matting agents for coating compositions; rheology modifying agents; anti-blocking agents; smoothing agents; light-diffusing agents; additives for advanced ceramics sintering; fillers for adhesives; and agents for medical diagnosis and examination and can also be used by being added to a resin composition for automotive materials, construction materials, or the like or to a molded product thereof.

Abstract: The present invention provides vinyl-based resin particles capable of easily smoothing the surface of a thermosetting resin film when the particles are used as a pore-forming material for a thermosetting resin. Specifically, the present invention provides vinyl-based resin particles for use in making a thermosetting resin porous, the particles having a temperature of 230° C. or higher and lower than 300° C. at 10% mass loss when heated at a rate of 10° C./min in an air atmosphere, and the particles having a mass loss percentage of 85 to 100% after being heated at 350° C. for 5 hours in an air atmosphere.

Abstract: Organic-inorganic composite particles include: a vinyl polymer that is a polymer of a polymerizable vinyl monomer; and inorganic particles including inorganic oxide and/or inorganic nitride. The thermal conductivity of the inorganic particles is 10 W/(m·K) or more. The inorganic particles are subjected to a surface treatment by acidic phosphoric acid ester having no polymerizable functional group, and by at least one polymerizable compound selected from the group consisting of: carboxylic acid having a polymerizable functional group; acidic phosphoric acid ester having a polymerizable functional group; and lactone having a polymerizable functional group. The polymerizable compound is bonded to the vinyl polymer, and the inorganic particles are unevenly located on surface layers of the organic-inorganic composite particles so that the inorganic particles form one or more layers.

Abstract: The present invention provides vinyl-based resin particles capable of forming uniform pores in a thermosetting resin film when the particles are used as a pore-forming material for a thermosetting resin. Specifically, the present invention provides vinyl-based resin particles for use in making a thermosetting resin porous, the particles having a temperature of 300 to 350° C. at 10% mass loss when heated at a rate of 10° C./min in an air atmosphere, and the particles having a mass loss percentage of 85 to 100% after being heated at 350° C. for 5 hours in an air atmosphere.

Abstract: Provided are hollow particles each having a shell including at least one layer, wherein the hollow particles have an average particle diameter of 10 to 200 nm and the at least one layer contains a vinyl-based resin.

Abstract: Organic-inorganic composite particles include: a vinyl polymer that is a polymer of a polymerizable vinyl monomer; and inorganic particles including inorganic oxide and/or inorganic nitride. The thermal conductivity of the inorganic particles is 10 W/(m·K) or more. The inorganic particles are subjected to a surface treatment by acidic phosphoric acid ester having no polymerizable functional group, and by at least one polymerizable compound selected from the group consisting of: carboxylic acid having a polymerizable functional group; acidic phosphoric acid ester having a polymerizable functional group; and lactone having a polymerizable functional group. The polymerizable compound is bonded to the vinyl polymer, and the inorganic particles are unevenly located on surface layers of the organic-inorganic composite particles so that the inorganic particles form one or more layers.

Abstract: An expandable panel reinforcing material, including an expandable composition layer including at least a plastic component of a crosslinked polymer matrix having curability, a curing agent of the plastic component, a curing accelerator of the plastic component, a crosslinked polymer matrix, a filler, and a thermally decomposable blowing agent having a decomposition temperature of T° C., and a sheet-like fiber layer that is laminated on the expandable composition layer, in which the expandable composition layer exhibits a storage elastic modulus (G?) of 1×101 to 1×104 Pa when the storage elastic modulus (G?) is measured with a dynamic viscoelasticity measuring apparatus [provided that a measuring temperature is (T?10)° C.].

Abstract: A metal panel reinforcing material comprising a resin composition, including a plastic component that has at least curability and is for a crosslinked polymer matrix, a curing agent for the plastic component, a curing accelerator for the plastic component, and a crosslinked polymer matrix, and a sheet-like fiber substrate, in which when the metal panel reinforcing material is stuck to a metal panel having a thickness of 0.8 mm and heated to be integrated into a reinforced metal panel, the metal panel reinforcing material exhibits the following properties to said metal panel: in three-point bending measured at a span of 100 mm, (i) a strength improvement rate of strength at 1 mm displacement is 120% or more, (ii) a maximum strength improvement rate is 200% or more, and (iii) a strain energy up to a maximum point is 0.5 N·m or more.

Abstract: A hydrogel comprising water, a gel strength improving agent, and a polymer matrix containing the water and the gel strength improving agent, in which the polymer matrix includes a copolymer of a monofunctional monomer having one ethylenically unsaturated group and a polyfunctional monomer having 2 to 6 ethylenically unsaturated groups, the copolymer has a hydrophilic group binding to its main chain, and the hydrogel has a breaking strength of 5 kPa or more and a breaking elongation of 200% or more in a tensile test.

Abstract: Provided are hollow particles each having a shell including at least one layer, wherein the hollow particles have an average particle diameter of 10 to 200 nm and the at least one layer contains a vinyl-based resin.