Biaxially stretched biodegradable film

A biaxial stretching and biodegradation technology, which can be used in thin material processing, other household utensils, transportation and packaging, and can solve the problems of promoting the production of dioxins

Inactive Publication Date: 2005-05-18
MITSUBISHI PLASTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned vinylidene chloride has become a current environmental pollution source as mentioned above, and in fact, various problems such as promotion of dioxin production occur during low-temperature combustion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Polylactic acid (manufactured by Cargill-Dow Polymers LLC, trade name: EcoPLA4040D (Lot No. MJ0328P103)) with a weight average molecular weight of 200,000 and granular silica (product name : Sylysia 430) 1 part by weight is dried separately, after fully removing moisture, put it into a φ40mm co-direction twin-screw extruder, set at about 200°C to melt and mix, form a single strand, extrude, cool, and cut into grainy. The granules are used as a master mixture, dried again, mixed with 10% of the above-mentioned polylactic acid that is also dried, put into a φ40mm co-direction twin-screw extruder, and extruded into a sheet at a set temperature of 210°C. It was solidified by quenching in a rotating cooling drum, resulting in a substantially amorphous sheet.

[0056] The obtained sheet was heated with an infrared heater while in contact with warm water circulating rolls, stretched 3.0 times in the longitudinal direction at 77° C. between rolls having different circumferenti...

Embodiment 2

[0058] Except that the longitudinal stretching is stretched 2.7 times at 77°C, the transverse stretching is stretched 3.5 times at 76°C, and the heat treatment temperature is 125°C for 15 seconds, the same operation is carried out as in Example 1, and a film with a thickness of 40 μm is produced. . Table 1 shows the evaluation results of the obtained film.

Embodiment 3

[0060] Using polylactic acid with a weight average molecular weight of 200,000 (manufactured by Cargill-Dow Polymers LLC, trade name: EcoPLA4040D (Lot No. MJ0528P103)), the longitudinal stretch was stretched at 78°C by 3.0 times, and the transverse stretch was stretched at 77°C. 3.5 times, heat treatment at a heat treatment temperature of 120° C. for 15 seconds, and other operations were performed in the same manner as in Example 1 to form a film with a thickness of 40 μm. Table 1 shows the evaluation results of the obtained film.

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PUM

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Abstract

The object of the present invention is to provide a thermally adhesive property while enabling bonding, and suppress uneven thickness, breakage, whitening, unevenness, etc., that is, have tensile stability and can be decomposed in the natural environment. Biaxially stretched monolayer film for hermetic packaging. With polylactic acid polymer as the main component, according to the test method of JIS K7198 on the temperature dependence of dynamic viscoelasticity, the storage elastic modulus E' at 120°C is 100-230MPa.

Description

technical field [0001] The present invention relates to biodegradable biaxially stretched films. Background technique [0002] In the past, many plastic products, especially plastic packaging materials, were in many cases discarded shortly after use, and people pointed out their disposal problems. Representative products of plastics for general packaging include polyethylene, polypropylene, and polyethylene terephthalate (PET). These materials generate a large amount of heat when burned, and may damage the incinerator during burning. In addition, polyvinyl chloride, which is still widely used at present, cannot burn because of its self-extinguishing property. Many plastic products containing such incombustible materials are disposed of in landfills. However, due to their chemical and biological stability, they remain almost without decomposing, causing problems such as shortening the life of landfills. For this reason, products with low calorie of combustion, which decompo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/12B29C71/02C08G63/08C08J5/18C08L67/04C08L101/16
CPCC08J5/18C08J2367/04C08L67/04Y10S428/91Y10T428/2813Y10T428/2817Y10T428/2826Y10T428/31786
Inventor 寺田滋宪高木润
Owner MITSUBISHI PLASTICS INC
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