Invention Grant
- Patent Title: Polypropylene for film capacitor, biaxially stretched film for film capacitor, film capacitor, and process for producing the same
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Application No.: US15562796Application Date: 2016-03-30
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Publication No.: US10256041B2Publication Date: 2019-04-09
- Inventor: Satoshi Tamura , Jun Birukawa , Hiroki Shimizu
- Applicant: PRIME POLYMER CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: PRIME POLYMER CO., LTD.
- Current Assignee: PRIME POLYMER CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Foley & Lardner LLP
- Priority: JP2015-073210 20150331
- International Application: PCT/JP2016/060304 WO 20160330
- International Announcement: WO2016/159044 WO 20161006
- Main IPC: H01G4/18
- IPC: H01G4/18 ; C08J5/18 ; C08K5/156 ; C08L23/12 ; C08F110/06 ; C08K5/1575 ; H01G4/33 ; C08J3/20 ; C08K5/053 ; B29C47/00 ; B29C55/14 ; B29K23/00 ; B29L31/34

Abstract:
A polypropylene (F) for film condensers having the following requirements: (1) an MFR (JIS K 7210, 230° C., 2.16 kg load) in the range of 1-10 (g/10 min), (2) an mmmm fraction that is at least 93%, (3) a erythro position defect amount as measured using 13C-NMR that is less than 0.1 mol %, (4) ash content obtained by complete combustion in atmosphere that is at most 50 ppm, (5) chlorine content as measured by ion chromatography that is at most 5 ppm; and (6) is obtained by including a propylene homopolymer for which Mw/Mn as measured via GPC is 6.5-12 and an α-crystal nucleating agent with a melting point of at most 290° C.
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