Sekisui Plastics Co., Ltd.

Sekisui Kasei Co., Ltd.

Ryosuke Harada

Akiyoshi Kusaka

Masaaki Nakamura

Kaori Kuwagaki

Fumitaka Ishimori

Yoshinao Yamaji

Kohei Tanaka

Koichiro Okamoto

Tomoyuki Takahashi

Kengo Nishiumi

Sou Aizawa

Eiji Tokunaga

Keisuke Seto

Takahashi Tomoyuki

Ishimori Fumitaka

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.

Vinyl-based resin particles and method for producing same

Silica-including microcapsule resin particles including an outer shell constituted of a crosslinked polymer and a cavity partitioned with the outer shell, in which the silica-including microcapsule resin particles contain inside the cavity a porous structure in which silica particles are mutually connected, and have a volume average particle diameter of 0.5 to 100 &#x3bc;m.

Silica-including microcapsule resin particles, method for producing same, and application thereof

Fluorescent resin particles which comprise a water-soluble fluorescent dye and a polymer made from a monomer mixture.

Fluorescent resin particles and use thereof

Spherical polyester-based resin particles characterized in that the spherical polyester-based resin particles contain a polyester-based resin and have a crystallinity of 20% or less and an average circularity of 0.96 or more. The spherical polyester-based resin particles according to the present invention can provide suitable resin particles as compounding agents for cosmetics such as foundation, antiperspirants, and skin scrubs; various agents such as matte coating agents for paints, rheology modifying agents, antiblocking agents, slipperiness-imparting agents, light diffusion agents, electroconductive agents, and diagnostic testing agents for medical use; and additives to molded articles such as automobile materials and construction materials.

Spherical polyester resin particles and method for producing same

The present invention provides non-spherical metal-coated irregularly-shaped resin particles that can improve characteristics, such as light diffusion characteristics and reflection characteristics, when used for optical applications, compared with spherical metal-coated resin particles. Specifically, the present invention provides metal-coated irregularly-shaped resin particles in which part of the surface of irregularly-shaped resin particles is coated with metal.

Metal-coated non-spherical resin particles and method for producing same, aligned film of metal-coated non-spherical resin particles and method for producing same, particles, and method for producing particle-aligned film

Polyester-based resin particles including a polyester-based resin as a base resin, in which the base resin exhibits a plurality of endothermic peaks corresponding to crystal melting temperatures by DSC measurement, at least one of the endothermic peaks exists in each region of a low temperature side region and a high temperature side region, a maximum endothermic peak of the low temperature side region and a maximum endothermic peak of the high temperature side region exhibit a crystal melting heat amount ratio (low temperature side crystal melting heat amount/high temperature side crystal melting heat amount) in a range of 0.1 to 1.5, and the polyester-based resin particles have a volume average particle diameter of 1 to 50 &#x3bc;m.

Polyester-based resin particles, process for producing same, and use thereof

A high-recoverability resin particles having a mean particle size of 1 to 100 &#x3bc;m containing a cross-linked (meth)acrylic acid ester-based resin, wherein the high-recoverability resin particles have a recovery rate of 22% or greater, and a 30% compression strength of 1.5 to 5.0 kgf/mm.

High-recoverability resin particles of a crosslinked (meth)acrylic acid ester-based resin, and use thereof

Spacer particles for a resin composition layer have a compressive strength at 10% compressive deformation (10% compressive strength) at room temperature (rt) of 0.05 to 10 MPa, have a rate of change in 10% compressive strength-by a temperature change from rt to 50&#xb0; C. of 5% or less or have a rate of change in 10% compressive strength by a temperature change from &#x2212;20&#xb0; C. to rt of 30% or less, and have a volume average particle diameter of 2 to 200 &#x3bc;m and a coefficient of variation in particle diameter of 15% or less.

Spacer particle for resin composition layer and use thereof

A process for producing resin particles includes a step in which a polymerizable mixture including a polymerizable monomer including at least one of a styrene-based monomer and a (meth)acrylic-based monomer, and a polymerization initiator is absorbed into seed particles in an aqueous medium, without using a dispersant, in the presence of an anionic surfactant not having a polyoxyethylene chain but having an alkyl group; and a step in which the polymerizable monomer is polymerized in an aqueous medium, without using a dispersant, in the presence of an anionic surfactant having a polyoxyethylene chain to thereby obtain resin particles. The resin particles include a resin derived from a polymerizable monomer including at least one of a styrene-based monomer and a (meth)acrylic-based monomer. The proportion by number of particles having a particle diameter in the range of from 80 to 120% of the volume-average particle diameter is 85% or more.

Resin particles and process for producing same, antiglare film, light-diffusing resin composition, and external preparation

Porous resin particles are disclosed that comprise a polymer of a monomer mixture. The monomer mixture includes: a mono(meth)acrylate-based monomer in an amount of 3 wt % to 40 wt % containing: an ethylenic unsaturated group only in a (meth)acrylic acid residue; and a hydroxyl group and at least either an ether group or an ester group in an alcohol residue; another monofunctional vinyl-based monomer in an amount of 10 wt % to 69 wt % containing a single ethylenic unsaturated group; and a polyfunctional vinyl-based monomer in an amount of 30 wt % to 70 wt % containing two or more ethylenic unsaturated groups.

Porous resin particles, method for manufacturing the same, dispersion liquid, and use thereof

The invention provides non-spherical resin particles with a novel shape capable of improving light diffusion, adhesion, oil absorption, and other properties, as well as a manufacturing method and use of the particles. Each non-spherical resin particle includes a concave portion and a convex portion formed in the concave portion, wherein the convex portion has a quasi-spherical surface. The method of manufacturing non-spherical resin particles involves a step of polymerizing 100 parts by weight of a first monomer mixture containing 77 to 99.99 parts by weight of a branched alkyl methacrylate, 0.01 to 3 parts by weight of a polyfunctional monomer, and 0 to 20 parts by weight of a monofunctional (meth)acrylate which is not a branched alkyl methacrylate, in the presence of 0.1 to 0.9 parts by weight of a chain transfer agent and 0 to 100 parts by weight of a (meth)acrylate polymer, to obtain resin particles.

Non-spherical resin particles, manufacturing method thereof, and use thereof

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 () and (), with the second resin component () 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.

A method for producing a deformed shaped particles comprising step of: absorbing a polymerizable vinyl type monomer contained in an aqueous emulsion in a seed particles and polymerizing an absorbed polymerizable vinyl type monomer, wherein

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Shiga, Japan

Ryosuke Harada