Belt

{
  "publication_number": "US9624372B2",
  "country": "US",
  "kind": "B2",
  "title": "Belt",
  "abstract": "In the belt according to the present invention, the whole or a part of a belt body is formed from a thermoplastic resin composition (C) comprising a thermoplastic resin (A) and a modified ethylene copolymer (B) dispersed and contained therein. The modified ethylene copolymer (B) is preferably a copolymer, modified with an unsaturated carboxylic acid or a derivative thereof, of ethylene with at least one monomer component selected from (i) olefin components except for ethylene, (ii) diene components and (iii) ester components having an ethylenically unsaturated group. The belt according to the present invention hardly causes abrasion, damage, cracks, breakage and the like on the belt body and is remarkably excellent in durability, even if the belt is used at a high load for a long time.",
  "claims": [
    "1. A belt, excluding toothed belts, wherein the whole or a part of a belt body is formed from a thermoplastic resin composition (C) comprising a thermoplastic resin (A) and a modified ethylene copolymer (B), and obtained by dispersing the modified ethylene copolymer (B) into the thermoplastic resin (A), wherein the thermoplastic resin (A) is at least one selected from the group consisting of polyacetal resins and polyamide-based thermoplastic elastomers, wherein a weight proportion [(B)/(A)] of the modified ethylene copolymer (B) to the thermoplastic resin (A) is in the range of 0.1/99.9 to 30/70, and the thermoplastic resin (A) and the modified ethylene copolymer (B) form a continuous phase and a disperse phase, respectively, in the thermoplastic resin composition (C), wherein the modified ethylene copolymer (B) in the thermoplastic resin composition (C) has an average dispersed particle aspect ratio of 1 to 3.5 and an average dispersed particle diameter of not more than 3 μm.",
    "2. The belt according to claim 1, wherein the modified ethylene copolymer (B) is a copolymer modified with an unsaturated carboxylic acid or a derivative thereof, the copolymer being a copolymer of ethylene with at least one monomer component selected from the group consisting of (i) olefin components except for ethylene, (ii) diene components and (iii) ester components having an ethylenically unsaturated group.",
    "3. The belt according to claim 1, wherein the modified ethylene copolymer (B) is an ethylene-propylene-diene copolymerized rubber modified with an unsaturated carboxylic acid or a derivative thereof.",
    "4. The belt according to claim 1, wherein the thermoplastic resin composition (C) has a hardness (JIS K6253, durometer type A) of not less than 60.",
    "5. The belt according to claim 2, wherein the thermoplastic resin composition (C) has a hardness (JIS K6253, durometer type A) of not less than 60."
  ],
  "description_excerpt": "The present invention relates to a belt (excluding toothed belts) utilized for power transmission, conveyance and the like, particularly to a belt in which the whole or a part of a belt body is formed from a specific thermoplastic resin composition.\n\nConveyance belts and transmission belts require bending fatigue resistance, abrasion resistance, heat resistance, durability and the like, for example, as flat belts, V-belts and the like. Belts are usually imparted with a tension and used in an elongated state. Belts are used in combination with resin-made or metal-made pulleys rotating at a high speed, and are contacted with pulleys, and caused to be wound therearound and to be rubbed together, and are exposed to collision with and rubbing on conveyed materials, and the like.\n\nJapanese Patent Laid-Open Nos. 2009-197896 and 2011-121689 disclose conveyance flat belts whose belt body is formed from a thermoplastic elastomer such as a thermoplastic polyurethane elastomer.\n\nHowever, if conventional flat belts and V-belts having a belt body thereof formed from a thermoplastic elastomer such as a thermoplastic polyurethane elastomer are used as high-load power transmission belts, the belt body abrades and cracks in an early stage, and provides the belts with insufficient durability in some cases.\n\nTherefore, it is an object of the present invention to provide a belt (excluding toothed belts) which does not cause abrasion, damage, cracks, breakage, and the like on the belt body in an early stage, and is thus remarkably excellent in durability even if being used at a high load for power transmission and the like.",
  "cpc": [
    "C08L 75/06",
    "B65G 15/32",
    "C08G 18/4277",
    "C08G 18/4854",
    "C08G 2350/00",
    "C08G 2380/00",
    "C08G 2410/00",
    "C08G 69/40",
    "C08G 69/44",
    "C08J 5/00",
    "C08L 101/00",
    "C08L 2207/04",
    "C08L 23/0869",
    "C08L 23/16",
    "C08L 23/26",
    "C08L 53/025",
    "C08L 67/02",
    "C08L 67/025",
    "C08L 75/04",
    "C08L 75/12",
    "C08L 77/02",
    "C08L 77/06",
    "C08L 77/12",
    "F16G 1/14",
    "Y10T 428/1372"
  ],
  "ipc": [
    "B65G 15/32",
    "C08G 69/40",
    "C08G 69/44",
    "C08L 23/08",
    "C08L 23/16",
    "C08L 23/26",
    "C08L 53/02",
    "C08L 67/02",
    "C08L 75/04",
    "C08L 75/06",
    "C08L 75/12",
    "C08L 77/02",
    "C08L 77/06",
    "C08L 77/12",
    "F16G 1/14"
  ],
  "assignees": [
    "Nitta Corp"
  ],
  "inventors": [
    "Takahiko Yoshida",
    "Shoji Shimizu",
    "Akihiko Matsumoto"
  ],
  "filing_date": "2012-03-29",
  "publication_date": "2017-04-18",
  "grant_date": "2017-04-18",
  "priority_date": "2011-03-31",
  "application_number": "US-201214007818-A",
  "family_id": "46931605",
  "cited_by_count": 3,
  "citations": [
    "US3882191A",
    "JPS62243631A",
    "US5149739A",
    "US5693714A",
    "JPH05287140A",
    "JPH05287141A",
    "US5594062A",
    "JPH0987477A",
    "JPH10103411A",
    "US6231965B1",
    "JPH11100512A",
    "US6207723B1",
    "JP2001247760A",
    "JP2004107440A",
    "US20090242094A1",
    "US20090275690A1",
    "JP2008266354A",
    "JP2008260887A",
    "US20100260991A1",
    "JP2009197896A",
    "US20100036028A1",
    "EP2228325A1",
    "US20120053020A1",
    "JP2011121689A",
    "US20140017429A1"
  ]
}