Biaxially stretched biodegradable film

A biaxial stretching, biodegradable technology, applied in thin material processing, household components, applications, etc., can solve problems such as promoting dioxin production

Inactive Publication Date: 2002-12-11
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 mention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Polylactic acid (manufactured by Cargill-Dow Polymers LLC, trade name: EcoPLA4040D (Lot No. MJ0328P103)) having a weight average molecular weight of 200,000 and granular silica (trade name) manufactured by Fuji Silysia Chemical Co., Ltd. having an average particle diameter of about 2.5 μm were prepared. : Sylysia 430) 1 part by weight was dried separately, and after fully removing moisture, put it into a φ40mm twin-screw extruder in the same direction, set it at about 200°C, melt and mix it into a single strand, extrude, cool, and cut into Granular. The pellets were used as a master mixture, dried again, mixed with 10% of the same dried polylactic acid, put into a biaxial extruder with a diameter of 40 mm in the same direction, and extruded into a sheet at a set temperature of 210 ° C. The rotating cooling drum is quenched and solidified to obtain a substantially amorphous sheet.

[0054] The obtained sheet was heated with an infrared heater while being in contact with...

Embodiment 2

[0055] A film with a thickness of 40 μm was produced in the same manner as in Example 1, except that the longitudinal stretching was performed at 77°C by 2.7 times, the transverse stretching was performed by 3.5 times at 76°C, and the heat treatment temperature was 125°C for 15 seconds. . Table 1 shows the evaluation results of the obtained films. (Example 3)

Embodiment 3

[0056] 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 stretching was performed at 78°C by 3.0 times, and the transverse stretching was performed at 77°C. 3.5 times, heat treatment at a heat treatment temperature of 120° C. for 15 seconds, and the same operations as in Example 1 were performed to prepare a 40 μm thick film. Table 1 shows the evaluation results of the obtained films. (Example 4)

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PUM

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Abstract

The object of the present invention is to provide a thermally adhesive material that enables bonding, and suppresses uneven thickness, breakage, whitening, unevenness, etc., that is, has tensile stability and is decomposable in the natural environment. biaxially stretched film. With polylactic acid polymer as the main component, according to the test method of JISK7198 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 often discarded shortly after use, and people pointed out their disposal problems. Typical products of general packaging plastics include polyethylene, polypropylene, and polyethylene terephthalate (PET). These materials generate a large amount of heat during combustion and may damage the incinerator during combustion processing. In addition, polyvinyl chloride, which is still widely used today, cannot burn due to its self-extinguishing properties. Most plastic products containing such incombustible materials are disposed of in landfills. However, due to their chemical and biological stability, they hardly decompose and remain, causing problems such as shortening the life of landfills. To this end, a lot of research has been done on products that are low in calories to...

Claims

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Application Information

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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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