| 摘要 |
<p>An water soluble biodegradable material wherein said material is a product obtained by melting of a mixture, said mixture contains starch, polyol and aqueous polyvinyl alcohol, said polyvinyl alcohol is hydrophilic polyvinyl alcohol. The content of polyol is from 19 to 40 weight percent based on the total weight of the mixture. Said material is a product obtained by melting of the mixture, the material has a melting temperature of 130 to 190 , a decomposition temperature of 250 to 400 , and the melting temperature is far less than the decomposition temperature, so that a molten state can be attained. The material has unexampled thermoplastic processibility compared with the mixture material obtained by a simple physical mixing of normal polyvinyl alcohol, starch and polyol, and true extrusion pelletizing and injection moulding can be realized. A film article produced by blow moluding said material has excellent tensile strength at break, elongation at break and right angle tear strength, and has very high biodegradation rate.</p> |
