JP2003113269A - Biodegradable resin composition and method of producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet that has excellent biodegradability and easy fabrication in addition to high rigidity and provide the fabricated articles from the sheet. SOLUTION: Starch and a variety of resin compositions are extruded to produce the formulated sheets in which the merits of individual resins are effectively utilized. The resin sheet has excellent biodegradability and fabrication properties in addition to excellent rigidity and can be expected to be used over a wide range of application.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a biodegradable resin composition which can be widely used.

[0002]

[Problems of the prior art] Since many biodegradable resins currently commercialized contain polyethylene and their rigidity is low, their usable range is limited.

[0003]

The problem to be solved by the present invention is a biodegradable, flexible composition (polyethylene).
On the other hand, in order to expand the usage, it is to provide a composition having a rigidity almost equal to that of a general-purpose plastic.

[0004]

[Means for Solving the Problems] To the biodegradable composition (polyethylene) described above, the rigidity is increased by adding a mixture of polystyrene and polypropylene, or by further mixing polystyrene, which is generally used. We found a biodegradable resin composition that compares favorably with general-purpose plastics.

That is, in the present invention, in order to compensate for the fact that the polyolefin resin, which is a biodegradable resin, has a large amount of polymer alloy and thus has a low rigidity, it is possible to increase the rigidity by incorporating a styrene resin. From this fact, it is expected to be used in a wide range equivalent to the field currently supported by molded articles such as polystyrene or polypropylene.

[0006]

Example: Starch resin 53%, polyethylene 27.3%,
A polymer alloy containing 15.2% polystyrene, 1.5% polypropylene and 3% stearic acid could be produced and processed with a molding machine. It is expected to be applicable as a packaging material and a food container that are used on a daily basis.

[0007]

[Blend range] As the range of the above blend, starch resin 10 to
90%, polyethylene 0.5 to 50%, polystyrene 0.5 to 50%, polypropylene 0.1 to 30%, activator 0.1 to 5%, and foaming agent (including foaming by gas). Examples of the activator include maleic acid, oleic acid, ethylene vinyl acetate copolymer and stearic acid.

EFFECTS OF THE INVENTION By mixing a starch resin having excellent biodegradability and a resin having excellent moldability and rigidity, a biodegradable resin having excellent moldability and rigidity can be obtained, and it can be used in a wide range. Becomes

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Claims (3)

[Claims] 1. Starch 10-90%, polystyrene 0.5
-50%, polyethylene 0.5-50%, polypropylene 0.1-30%, glycerin, maleic acid, sorbitol, ethylene-vinyl acetate copolymer 0.1-5%, foaming agent mixed, depending on the intended use Biodegradable plastic composition whose composition can be changed. 2. A sheet according to the composition of item 1. 3. A molded product of the composition of item 1.