公开(公告)号：US20230088053A1

公开(公告)日：2023-03-23

申请号：US17908896

申请日：2021-02-03

Applicant: PRIME POLYMER CO., LTD.

Inventor： Jun BIRUKAWA ,  Satoshi TAMURA ,  Hiroki SHIMIZU

IPC: C08L23/12 ,  C08F110/06 ,  B32B27/08 ,  B32B27/32

Abstract: An object of the present invention is to provide a film for a capacitor such that the film excels in high-temperature dielectric breakdown voltage (high-temperature BDV) and has blocking resistance, and bleeding-out of, for instance, a nucleating agent is suppressed even after long-term storage. The present invention pertains to a multilayer polypropylene film for a capacitor, the film including a base layer composed of a propylene polymer composition containing a propylene homopolymer (X) and 0.0001 to 0.05 mass % of a polymer-based α-crystal nucleating agent (C), and a front layer or a back layer composed of a propylene-based polymer (Y) on at least one surface of the base layer, wherein the base layer and the front layer or back layer are stretched.

公开(公告)号：US20180286588A1

公开(公告)日：2018-10-04

申请号：US15562796

申请日：2016-03-30

Applicant: PRIME POLYMER CO., LTD.

Inventor： Satoshi TAMURA ,  Jun BIRUKAWA ,  Hiroki SHIMIZU

IPC: H01G4/18 ,  C08F110/06 ,  C08K5/053 ,  C08K5/1575 ,  C08J3/20 ,  C08J5/18 ,  H01G4/33

CPC classification number: H01G4/18 ,  B29C47/0021 ,  B29C47/0057 ,  B29C55/143 ,  B29K2023/12 ,  B29K2995/0053 ,  B29L2031/3406 ,  C08F110/06 ,  C08J3/201 ,  C08J5/18 ,  C08K5/053 ,  C08K5/156 ,  C08K5/1575 ,  C08L23/12 ,  H01G4/33

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.