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Biodegradable layered sheet

A biodegradable, laminated board technology, applied in the field of laminated boards, can solve the problems of low heat resistance and unsuitability of polylactic acid resin, and achieve the effect of high heat resistance

Active Publication Date: 2008-12-03
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since polylactic acid resin has low heat resistance, it is considered unsuitable as a material for containers used at high temperatures, such as containers for storing food to be heated or boiling water

Method used

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  • Biodegradable layered sheet
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Resin 1 in Table 2 as polylactic acid was mixed with PBS (polybutylene succinate, manufactured by Showa Highpolymer Co., Ltd.: Bionolle 1001, melting point: 111° C.; glass transition temperature: -40° C.), mixed together at the ratio of polylactic acid resin / biodegradable aliphatic polyester=50 / 50 (% by mass). To 100% by mass of this mixture, 10% by mass of talc (manufactured by Nippon Talc Co., Ltd.: Micro Ace L1) was added as an inorganic filler, and the mixture was extruded at 220° C. Manifold extrusion head to extrude in the form of front and back layers.

[0106] In addition, Resin 4 in Table 2 as polylactic acid and PBS of the aforementioned model as biodegradable aliphatic polyester were mixed according to polylactic acid resin / biodegradable aliphatic polyester=50 / 50 (% by mass) proportions are mixed together. To 100% of this mixture by mass, add 10% by mass of the aforementioned type of talc as an inorganic filler, and extrude this mixture in the form of an in...

Embodiment 2

[0109] Resin 1 in Table 2 as polylactic acid and PBS of the aforementioned model as biodegradable aliphatic polyester were mixed at a ratio of polylactic acid resin / biodegradable aliphatic polyester=25 / 75 (% by mass) Mix together. To this mixture of 100% by mass, add 20% by mass of the aforementioned type of talc as an inorganic filler, and the mixture is extruded from the multi-manifold head of a parallel twin-screw extruder with a diameter of 25mm at 220°C, the previous layer and extrude in the form of the back layer.

[0110] In addition, Resin 4 in Table 2 as polylactic acid and PBS of the aforementioned model as biodegradable aliphatic polyester were calculated as polylactic acid resin / biodegradable aliphatic polyester=25 / 75 (mass%) proportions are mixed together. To 100% of this mixture by mass, add 20% by mass of the aforementioned type of talc as an inorganic filler, and extrude this mixture in the form of an intermediate layer from the multi-manifold extrusion head ...

Embodiment 3

[0113] Resin 1 in Table 2 as polylactic acid and PBS of the aforementioned model as biodegradable aliphatic polyester were used in a ratio of polylactic acid resin / biodegradable aliphatic polyester=75 / 25 (% by mass) Mix together. To this mixture of 100% by mass, add 10% by mass of the aforementioned type of talc as an inorganic filler, and the mixture is extruded from the multi-manifold head of a parallel twin-screw extruder with a diameter of 25mm at 220°C, the previous layer and extrude in the form of the back layer.

[0114] In addition, Resin 4 in Table 2 as polylactic acid and PBS of the aforementioned model as biodegradable aliphatic polyester were calculated on the basis of polylactic acid resin / biodegradable aliphatic polyester=75 / 25 (mass%) proportions are mixed together. To 100% of this mixture by mass, add 10% by mass of the aforementioned type of talc as an inorganic filler, and extrude this mixture in the form of an intermediate layer from the multi-manifold ext...

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Abstract

It is an object to provide a biodegradable laminated sheet which is high in heat resistance, impact resistance and strength when subjected to loads at high temperature, does not develop wrinkles called 'bridges', which can be easily deep-drawn or formed into blister articles, which are typically complicated in shape. The biodegradable sheet is a laminated sheet comprising at least two layers. Each of the layers forming the laminated sheet is a resin composition comprising 75 to 25% by mass of a polylactic acid resin, and 25 to 75% by mass of a polyester resin having a glass transition temperature not exceeding 0 degrees C and a melting point higher than the glass transition temperature of the polylactic acid resin, and not exceeding the melting point of the polylactic acid resin, based on 100 mass percent of the total amount of the polylactic acid resin and the polyester resin. The D-lactic acid content of the polylactic acid resin contained in one layer, and the D-lactic acid content of the polylactic acid resin in the other layer are determined to satisfy a predetermined relationship. The laminated sheet is subjected to crystallization treatment.

Description

technical field [0001] The present invention relates to biodegradable laminates, articles made from such laminates, and methods of forming the articles. Background technique [0002] Plastics such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyethylene terephthalate have been used for food containers (such as cups and plates), blister packs, hot-fill containers, delivery Materials for trays, carrier tapes, and the like of electronic components. [0003] These plastic items are usually thrown away shortly after use, and how to dispose of them such as incineration or landfill is now an important issue. Specifically, these resins such as polyethylene, polypropylene, and polystyrene have a high calorific value when incinerated, so when they are burned in an incinerator, they tend to damage the incinerator. Harmful gases are produced when PVC is burned. If these plastics are landfilled, they tend to fill up landfills in the short term, as they remain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/36
Inventor 江川洋介
Owner MITSUBISHI CHEM CORP
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