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Biaxially stretched multilayer polypropylene film and use thereof

A technology of polypropylene film and biaxial stretching, which is applied in the direction of coating, layered products, thin material processing, etc., can solve the problems of low color density, poor appearance, rough image, etc., and achieve high gloss and color density, Excellent lamination adaptability and excellent heat resistance

Inactive Publication Date: 2008-04-09
TOHCELLO CO LTD (JP)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the surface roughness specified in JP-A-2000-127303 is 0.08 to 0.6 μm, and the density of the support is also 0.67 to 0.77 g / cm 3 range, but it is not sufficient to print high-pixel digital images that have been rapidly developed in recent years, and there are problems such as images that tend to become rough and low color density.
In addition, when using a thermal transfer printing sheet for printing, there are disadvantages such as denting of the printing part of the thermal transfer printing sheet due to the heat from the thermal head, and poor appearance.
In particular, the denser the printing density, the larger the depressions, and the unevenness of the high-contrast image is prominent, and there is a problem that the appearance is very unsightly.
In addition, it is also difficult to manufacture in terms of further improving surface smoothness while ensuring concealment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112]

[0113]Add tetrakis[methylene-3-(3',5 '-di-tert-butyl-4'-hydroxyphenyl) propionate] methane (the product of Ciba gaiki company in Japan, product name "Irganox 1010") 1000ppm and the composition of calcium stearate (manufactured by NOF) 1000ppm;

[0114] The propylene monomer (PP-1) is pre-mixed with calcium carbonate powder [average particle size: 1.2 μm, maximum particle size: 5 μm, 90% cumulative frequency particle size is 2.5 μm, moisture content: below 400 ppm (Karl Fischer method, measured at 200°C)] and mix the obtained composition with rutile-type titanium oxide [average particle size: 0.2μm, moisture content: 400ppm] made of propylene monomer (PP-1) and alumina treated in advance The following (Karl Fischer method, measured at 200°C)] mixed compositions were dry-mixed separately to prepare propylene containing 76.5% of propylene monomer (PP-1), 19.5% of calcium carbonate and 4.0% of titanium oxide. Polymer composition (A-1).

[0115]

[0116] Preparation ...

Embodiment 2

[0121] Except that the extrusion ratio of the surface layer / substrate layer / back layer in Example 1 was set to "1 / 8.5 / 1", the same operation was performed as in Example 1 to obtain a base layer thickness of 34 μm and a surface layer thickness of 4 μm. A biaxially oriented laminated polypropylene film with a back layer thickness of 4 μm (total thickness: 42 μm).

[0122] The evaluation results are shown in Table 1.

Embodiment 3

[0124] In Example 1, the extrusion ratio was the same as in Example 2, and the obtained multilayer sheet was heated at 120° C. and stretched 5.0 times in the flow direction (longitudinal direction) of the film. The substrate layer was obtained in the same manner as in Example 1, except that the 5.0-fold stretched sheet was heated at 170°C and stretched 10 times in the direction perpendicular to the flow direction (transverse direction) (area ratio: 50 times). A biaxially oriented laminated polypropylene film having a thickness of 34 μm, a surface layer thickness of 4 μm, and a back layer thickness of 4 μm (total thickness: 42 μm).

[0125] The evaluation results are shown in Table 1.

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Abstract

Disclosed is a biaxially stretched multilayer polypropylene film wherein a front layer and back layer composed of a propylene polymer (a1) are respectively arranged on both sides of a biaxially stretched polypropylene film base layer (B) which is composed of a propylene polymer composition (A) obtained by adding an inorganic compound powder (a2) to the propylene polymer (a1). This biaxially stretched multilayer polypropylene film is characterized in that the front and back layers have a surface roughness (three-dimensional center plane average roughness SRa) of less than 0.08 [mu]m and a glossiness (incident angle: 60 degrees) of not less than 114%, and the multilayer polypropylene film has a total light transmittance of not more than 20% and a density of 0.40-0.65 g / cm<3>.

Description

technical field [0001] The present invention relates to a biaxially stretched laminated polypropylene film suitable as a support for an image printing body, which has low density, and has excellent surface smoothness, concealment, surface gloss, anti-blocking property and lamination adaptability, and its use. Background technique [0002] Biaxially oriented polypropylene film (hereinafter referred to as "OPP film") is used in a wide range of fields represented by packaging materials by making effective use of its excellent properties such as transparency, mechanical strength, and rigidity. In addition, as a method of improving the concealment of the OPP film and bringing surface glossiness, it is proposed to add an organic material such as nylon resin or an incompatible material such as an inorganic material such as glass beads to polypropylene as a core material, and A proposal in which the surface layer is a biaxially oriented film without an added polypropylene layer (JP-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B41M5/382B41M5/50B41M5/52
CPCB41M5/508B32B27/32B41M2205/32B41M5/41B41M2205/02Y10T428/256Y10T428/31692Y10T428/31587Y10T428/31855B32B7/12B32B2255/10B32B2323/10B32B2375/00B32B27/06B32B2307/518
Inventor 本田启志塚田力久保直树清水良浩
Owner TOHCELLO CO LTD (JP)
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