Laminated film most popular for stretch packaging

2022-08-08
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Laminated film for stretch packaging

patent name laminated film for stretch packaging patent applicant Mitsubishi resin Co., Ltd; The address of the principal applicant of mitsukawa Industrial Co., Ltd. is hiroichiro Taniguchi, inventor in Tokyo, Japan; Sasaki Xiushu; Kishima Zhengren application (patent) No 5 application date: July 22, 2003 date of issuance approval Announcement No. approval announcement date: October 19, 2005 specification CD-ROM No. d0542 main classification No. b32b27/32 classification No. b32b27/32 division original application No. priority item 2002.8.26 JP 245502/2002 abstract the invention provides a laminated film for stretch packaging comprising at least three layers, wherein the laminated film comprises two surface layers, and the surface layer comprises ethylene polymer component (a) as the main component, And containing at least one intermediate layer formed by a layer containing lifelong protection of the resin composition as the main component by using residual energy after punching the sample. The resin composition comprises a wt% component (b), which is a polypropylene resin with controlled stereoregularity in specific characteristics; The amount of component (c) is wt%, and component (c) is a crystalline polypropylene resin with a crystal melting peak temperature of 120 ℃ or higher; And component (d) in wt%, which is petroleum resin. The film of the invention is excellent in the following aspects: storage stability of raw material pellets, packaging efficiency, packaging smoothness, elastic recovery, bottom sealing performance, transparency, etc. Sovereignty item 1 A laminated film for stretching bag Jinan experimental machine factory Jinan new era Gold Testing Instrument Co., Ltd. which includes at least three layers, is characterized in that the laminated film contains two surface layers, the surface layer contains component (a) as the main component, component (a) is ethylene polymer, and contains at least one intermediate layer formed by a mixed resin layer, the mixed resin layer contains the resin composition as the main component, The resin composition contains wt% of the following component (b): polypropylene resin with controlled stereoregularity that meets the following requirements (1) and (2): (1) the racemic five unit component [mmmm] determined from 13C-NMR spectrum is 0 7. And (2) racemic five unit components [rrrr] and (1-mmmm) meet the following relationship: [rrrr/(1-mmmm)] ≤ 0.1; Wt% of the following components (c): crystalline polypropylene resin with a crystal melting peak temperature of 120 ℃ or higher; And wt% of the following component (d): at least one resin selected from petroleum resin, terpene resin, benzofuran indene resin, rosin resin and its hydrogenated derivatives. International application pct/jp2003/009248 2003.7.22 international publication wo2004/018203 March 2004 entry date national patent agency China Council for the promotion of international trade patent and Trademark Office institutional address agent wuyihua

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