Invention Grant
- Patent Title: Polypropylene film and laminated material thereof
- Patent Title (中): 聚丙烯膜及其层压材料
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Application No.: US11791866Application Date: 2005-11-28
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Publication No.: US07732027B2Publication Date: 2010-06-08
- Inventor: Yoichi Matsuura , Masanori Takeuchi , Kouji Kataoka , Hiroshi Nozawa
- Applicant: Yoichi Matsuura , Masanori Takeuchi , Kouji Kataoka , Hiroshi Nozawa
- Applicant Address: JP JP
- Assignee: Toray Advanced Film Co., Ltd.,Sumitomo Chemical Company Limited
- Current Assignee: Toray Advanced Film Co., Ltd.,Sumitomo Chemical Company Limited
- Current Assignee Address: JP JP
- Agency: DLA Piper LLP (US)
- Priority: JP2004-343559 20041129
- International Application: PCT/JP2005/021761 WO 20051128
- International Announcement: WO2006/057378 WO 20060601
- Main IPC: B29D22/00
- IPC: B29D22/00 ; B32B15/08 ; B32B27/00 ; C08L23/00 ; B65D81/32 ; B65D81/34 ; B65D77/20

Abstract:
A polypropylene film comprising 70-90 wt. % polymer (a), 2-10 wt. % polymer (b), 2-10 wt. % polymer (c) and 3-20 wt. % polymer (d) and having a haze of 8-30% (wherein the polymer (a) is a block copolymer prepared by producing a polymer part (component a1) by polymerizing in a first step monomers composed mainly of propylene in the absence of an inert solvent and producing an ethylene/propylene copolymer part (component a2) in a second step by polymerization subsequently carried out in a gas phase; the polymer (b) is an ethylene-based polymer having a density of 0.91-0.97 g/cm3 and a melt flow rate of 5-30 g/10 min; the polymer (c) is an ethylene/α-olefin random copolymer having a density of 0.86-0.90 g/cm3 and a melt flow rate of 0.3-5 g/10 min; and the polymer (d) comprises two or more propylene-based polymers different in molecular weight from each other).
Public/Granted literature
- US20080213519A1 Polypropylene Film and Laminated Material Thereof Public/Granted day:2008-09-04
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