Biodegradable composition, processed biodegradable article such as food container, and method of producing the same
The present invention provides a processed biodegradable article having excellent water resistance and rigidity, which can be used as a food container, and a biodegradable composition required to produce the processed biodegradable article comprising 15-75% by mass starch, 5-50% by mass protein, 3-50% by mass cellulose fiber, 0.5-20% by mass polyphenols such as pyrogallol and gallic acid, and 0-5% by mass sodium chloride.
1. A biodegradable composition comprising:
15% by mass or more and 75% by mass or less of starch,
5% by mass or more and 50% by mass or less of protein,
3% by mass or more and 50% by mass or less of cellulose fiber,
0.5% by mass or more and 20% by mass or less of polyphenols, wherein the polyphenols are any one or two kinds of pyrogallol and gallic acid, and
0% by mass or more and 5% by mass or less of sodium chloride.
2. The biodegradable composition according to claim 1 , wherein a mass ratio of starch/protein is 1 or more and 12 or less.
3. The biodegradable composition according to claim 1 , wherein the mass ratio of starch/protein is 1 or more 3 or less, and the content of protein is 15% by mass or more.
4. The biodegradable composition according to claim 1 , wherein the cellulose fiber is a natural vegetable fiber or artificial cellulose fiber.
5. A processed biodegradable article comprising the biodegradable composition according to claim 1 .
6. The processed biodegradable article according to claim 5 , which is any one of a food container, chopsticks, a spoon, a fork, a knife, a bottle, a cup and a dish.
7. A method for producing a processed biodegradable article, the method comprising the steps of:
kneading the biodegradable composition according to claim 1 after adding water thereto,
molding and processing the kneaded biodegradable composition, and
heat-treating the molded article.
8. The method for producing a processed biodegradable article according to claim 7 , wherein the molded article is heat-treated at 120° C. or higher and 180° C. or lower.
9. The method for producing a processed biodegradable article according to claim 7 , wherein the processed biodegradable article is any one of a food container, chopsticks, a spoon, a fork, a knife, a bottle, a cup and a dish.