Biodegradable molded articles coated to impart hydrophobicity

C - Chemistry – Metallurgy – 08 – J

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C08J 9/36 (2006.01) B29C 44/12 (2006.01) B65D 65/46 (2006.01)

Patent

CA 2476799

A bowl-shaped container (10a) which is as a biodegradable molded article adheres a coating film (12) mainly made of biodegradable plastic and having at least hydrophobicity to the surface of the main body (11a) of the container mainly made of starch. The main body (11a) is molded through steam expansion of a slurry or dough molding material containing high-amylose starch and water, or a slurry or dough molding material containing starch, polyvinyl alcohol and water. For these reasons, it is possible to accomplish sufficient strength and at least sufficient water resistance, to exert a very excellent biodegradability and further to provide a biodegradable molded article having excellent moisture absorption strength mainly made of starch even if the biodegradable molded article has a complicated shape.

La présente invention se rapporte à un contenant (10a) ayant la forme d'un saladier, utilisé en tant que moulage biodégradable, qui comporte un corps principal de contenant (11a) principalement composé d'amidon et d'un film de revêtement (12) qui est collé à la surface dudit corps, qui possède au moins certaines caractéristiques hydrophobes et composé principalement d'un plastique biodégradable. Le corps principal (11a) du contenant est obtenu par formage à la vapeur d'une matière de moulage de type boue ou pâte comportant une forte teneur en amidon d'amylose ainsi que de l'eau, ou d'une matière de moulage de type boue ou pâte comportant de l'amidon, de l'alcool polyvinylique et de l'eau. Il est ainsi possible d'obtenir un moulage biodégradable composé principalement d'amidon, qui, même s'il est doté d'une structure complexe, peut non seulement présenter une solidité satisfaisante et une résistance à l'eau au moins satisfaisante mais également être doté d'une biodégradabilité hautement souhaitable et d'une grande résistance à l'humidité.

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