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Heat-sealable polypropylene laminated stretch film

A heat-sealing layer, stretched polypropylene technology, applied in the direction of layered products, synthetic resin layered products, packaging items, etc. rigid effect

Active Publication Date: 2017-09-22
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The films in the above-mentioned Patent Documents 4 to 5 cannot be said to have sufficient heat resistance at high temperatures, and a polypropylene film having high heat resistance, excellent impact resistance, and transparency has not yet been known.
[0010] That is, these films do not exceed the category of conventional polypropylene films, and their applications are limited. For example, attention has not been paid to heat resistance at high temperatures exceeding 150°C.

Method used

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  • Heat-sealable polypropylene laminated stretch film
  • Heat-sealable polypropylene laminated stretch film
  • Heat-sealable polypropylene laminated stretch film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0193] Using 2 melt extruders, in the first extruder, as polypropylene resin, in M w / M n =7.7, M z+1 / M n =140, MFR=5.0, [mmmm]=97.3% propylene homopolymer (manufactured by Japan Polypropylene Corporation: NOVATEC PP "SA4L") as the substrate layer (A), in the second extruder, propylene- Ethylene-butene random copolymer (Pr-Et-Bu) (density 0.89g / cm 3 , MFR4.6g / 10min, melting point 128°C) 85% by weight, propylene-butene random copolymer (Pr-Bu) (density 0.89g / cm 3 , MFR9.0g / 10min, melting point 130°C) 15% by weight mixed resin as the heat-sealing layer (B), in the mold to become the base material layer (A) / heat-sealing layer (B), the base material The sequence of layer (A) and heat-sealing layer (B) is melted and co-extruded into a sheet at 250°C by means of a T-die, then cooled and solidified with a cooling roll at 30°C, and then cooled and solidified at 135°C along the length Stretch to 4.5 times in the direction, then clamp both ends with clamps, introduce into a hot ...

Embodiment 2

[0195] In the substrate layer (A), 10 parts by weight of low molecular weight polypropylene (Hi-WAX "NP105" manufactured by Mitsui Chemicals, Inc.) with a molecular weight of 10000 was added to 90 parts by weight of "SA4L" to form 100 parts by weight After the two are dry-blended, a 30mm twin-screw extruder is used for melt-kneading to obtain mixture granules. Using these particles as the base material layer (A), a laminated film was obtained in the same manner as in Example 1. The physical properties of the obtained film are shown in Table 1, Table 2, and Table 3.

Embodiment 3

[0197] A laminated film was obtained in the same manner as in Example 1 except that the preheating temperature in transverse stretching was 173°C, and the stretching temperature and heat treatment temperature were 167°C. The physical properties of the obtained film are shown in Table 1, Table 2, and Table 3.

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Abstract

The present invention provides a heat-sealable stretched polypropylene laminated film having a low shrinkage rate comparable to that of PET at 150°C and high rigidity. The stretched polypropylene laminated film is characterized in that it comprises: a base material layer (A) mainly composed of a polypropylene resin, a propylene random copolymer and The heat-sealing layer (B) of a polypropylene block copolymer, having a heat shrinkage ratio of 10% or less in the MD direction and a TD direction at 150° C., and an impact strength of 0.6 J or more.

Description

technical field [0001] This invention relates to heat sealable polypropylene laminated stretch films. More specifically, it relates to a biaxially stretched heat-sealable polypropylene laminated stretch film which has sufficient heat-sealing strength for packaging, has good transparency, and is suitable for applications requiring dimensional stability and high rigidity at high temperatures. Various fields, and excellent heat resistance and mechanical properties. Background technique [0002] At present, stretched films using polypropylene are widely used in a wide range of applications such as food, packaging of various products, electrical insulation, and surface protection films, and there are also applications requiring heat sealability. Conventionally, as a heat-sealable film, a coextruded laminated polypropylene resin film obtained by laminating a low melting point polyolefin resin on a polypropylene resin has been widely used. Such a heat-sealable film has a shrinkag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B29C55/02B32B27/00B29K23/00B29L9/00
CPCB29C55/023B29C55/143B29K2023/12B29K2023/14B32B27/08B32B27/205B32B27/32B32B2307/206B32B2307/306B32B2307/54B32B2307/558B32B2307/734B32B2439/70
Inventor 木下理山田浩司多贺敦
Owner TOYOBO CO LTD