Laminating film for stretch packaging

Patent name: Mitsubishi Plastics Co., Ltd., a patent applicant for laminated film for stretch packaging; Koichi Koguchi, inventor of Idemitsu Kosan Co., Ltd., Japan; Koichi Saguchi, Japan; Hideki Sasaki; 2003.07.22 certification date approval announcement number 1684827 approval announcement date 2005.10.19 specification CD-ROM D0542 main classification number B32B27/32 classification number B32B27/32 division original application number priority item 2002.8.26 JP 245502/2002 Abstracts The invention provides A laminated film for stretch packaging comprising at least three layers, wherein the laminated film contains two surface layers, the surface layer contains ethylene polymer component (A) as a main component, and contains at least one An intermediate layer formed from a layer containing a resin composition as a main component, the resin composition containing the component (B) in an amount of 30 to 75% by weight, and the component (B) has a controlled stereoregularity in terms of specific characteristics. Polypropylene resin; Component (C) in an amount of 20-60 wt%; Component (C) is a crystalline polypropylene resin having a crystal melting peak temperature of 120C or higher; and the amount is 5-30 wt%. Component (D), Component (D) is a petroleum resin. The film of the present invention is excellent in the following aspects: storage stability of raw material pellets, packaging efficiency, package finish, elastic recovery, bottom sealing performance, transparency, and the like. Slaves 1. A laminated film for stretch packaging comprising at least three layers, characterized in that the laminated film contains two surface layers, the surface layer containing component (A) as a main component, group Component (A) is an ethylene polymer, and contains at least one intermediate layer formed of a mixed resin layer containing a resin composition as a main component, the resin composition containing the following group in an amount of 30 to 75% by weight. Component (B): Polypropylene resin having controlled stereoregularity satisfying the following requirements (1) and (2): (1) The meso pentad fraction determined from the 13C-NMR spectrum [mmmm] is 0.2-0.7, and (2) the racemic pentad fraction [rrrr] and (1-mmmm) satisfy the following relationship: [rrrr/(1-mmmm)] ≤ 0.1; the number is 20-60 wt% of the following group Component (C): a crystalline polypropylene resin having a crystal melting peak temperature of 120C or more; and a quantity of 5 to 30 wt% of the following component (D): at least one member selected from the group consisting of a petroleum resin, a terpene resin, and benzo Furan-indene resins, rosin resins and their hydrogenated derivatives. International Application PCT/JP2003/009248 2003.7.22 International Publication WO2004/018203 Date 2004.3.4 Date of Entry into the Country Patent Agencies China Council for the Promotion of International Trade Patent and Trademark Office Agency Address Agent Wu Yihua

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