# US 2014/0194565 A1 · Non-spherical resin particles, manufacturing method thereof, and use thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194565 A1 - Document ID: US20140194565A1 - Status: Published application - Kind: A1 - Application number: 14/240,410 - Filed: 2012-08-27 - Published: 2014-07-10 - Earliest claimed: 2011-08-25 - Assignees: Sekisui Plastics Co., Ltd. - Applicants: Sekisui Plastics Co., Ltd. - Inventors: Ryosuke Harada - Web page: https://patentgrep.com/patent/US20140194565A1 ## CPC - C08L 33/14: of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen - A61K 8/0245: {Specific shapes or structures not provided for by any of the groups of A61K8/0241} - A61K 8/8152: {Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers} - A61Q 1/02: Preparations containing skin colorants, e.g. pigments (preparations in powder form A61Q1/12) - C08F 2/22: Emulsion polymerisation - C08J 3/126: {Polymer particles coated by polymer, e.g. core shell structures} - A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns - G02B 5/0242: {by means of dispersed particles} - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D) - A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## 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 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. In the method, the resin has a site derived from a (meth)acrylic acid ester having a C2-C10 halogenated alkyl group or alicyclic hydrocarbon group and has a weight-average molecular weight of from 150,000 to 1,000,000. The vinyl-based polymerizable monomer contains 5 to 50 wt % crosslinking monomer. ## Claims ### Claim 1 Non-spherical resin particles, each having 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, each of the non-spherical resin particles comprising a first resin component and a second resin component which is different from the first resin component, the second resin component residing locally near a surface of that particle. ### Claim 2 (depends on 1) The non-spherical resin particles as set forth in claim 1, wherein: each of the non-spherical resin particles has a partly missing sphere shape; the missing part has a surface at least a part of which is formed of the second resin component; and the rest of the surface of the particle is formed of the first resin component. ### Claim 3 (depends on 1) The non-spherical resin particles as set forth in claim 1, wherein said particles are semi-spherical. ### Claim 4 (depends on 1) The non-spherical resin particles as set forth in claim 1, wherein said particles are shaped like a biconvex lens. ### Claim 5 (depends on 1) The non-spherical resin particles as set forth in claim 1, wherein said particles are shaped like a mushroom. ### Claim 6 (depends on 1) The non-spherical resin particles as set forth in claim 1, wherein said particles have a horseshoe-like cross-section. ### Claim 7 (depends on 1) The non-spherical resin particles as set forth in claim 1, wherein the first resin component is a hydrophilic resin, and the second resin component is a hydrophobic resin. ### Claim 8 A method of manufacturing non-spherical resin particles, comprising either the set of steps of: allowing particles of a resin to absorb a vinyl-based polymerizable monomer contained in an aqueous emulsion; and polymerizing the absorbed vinyl-based polymerizable monomer or the set of steps of: dissolving a resin in a vinyl-based polymerizable monomer to prepare a solution; and polymerizing the solution in an aqueous medium, wherein: the resin has a moiety derived from a (meth)acrylic acid ester having in an ester moiety thereof a C2-C10 halogenated alkyl group or alicyclic hydrocarbon group and has a weight-average molecular weight of from 150,000 to 1,000,000 as measured by gel permeation chromatography; and the vinyl-based polymerizable monomer contains a crosslinking monomer in an amount of 5 to 50 wt % as based on a total amount of the vinyl-based polymerizable monomer. ### Claim 9 (depends on 8) The method as set forth in claim 8, wherein the vinyl-based polymerizable monomer contains a (meth)acrylic acid ester having an alkylene oxide group of a general formula: where R1 is either H or CH3, R2 and R3 are different C2-C5 alkylene groups, m and n are numbers from 0 to 50, at least either m or n being not 0, and R4 is either H or CH3. ### Claim 10 (depends on 1) An emulsifier, comprising non-spherical resin particles as set forth in claim 1. ### Claim 11 (depends on 1) An external preparation, comprising non-spherical resin particles as set forth in claim 1. ### Claim 12 (depends on 1) An emulsion, comprising non-spherical resin particles as set forth in claim 1. ### Claim 13 (depends on 1) A coating agent, comprising non-spherical resin particles as set forth in claim 1. ### Claim 14 (depends on 1) A light diffuser, comprising non-spherical resin particles as set forth in claim 1. ### Claim 15 (depends on 1) An optical member, comprising a base material and the non-spherical resin particles as set forth in claim 1, wherein the non-spherical resin particles are semi-spherical and arranged on the base material so that plane portions thereof face the base material. ### Claim 16 (depends on 15) The optical member as set forth in claim 15, serving as a light diffusing film, wherein the base material is a transparent film base material.