Foamed starch polymer

Details Foamed starch polymer Foamed starch polymer

C - Chemistry, Metallurgy

08

L

403/81, 403/83

C08L 3/02 (2006.01) C08B 30/12 (2006.01) C08J 9/00 (2006.01) C08J 9/12 (2006.01) C08J 9/28 (2006.01)

Patent

CA 2168216

In order to produce a substantially biologically degradable polymer foam, a thermoplastic or disaggregated starch or a polymer mixture of thermoplastic or disaggregated starch with at least one biologically degradable hydrophobic polymer is used. In addition, the material is mixed with a biologically degradable fibrous or capsular material capable of binding water by capillary action, said material being at least partially treated or saturated with water before being mixed with the polymer. The polymer/material mixture thus obtained is processed under controlled pressure and temperature so that the water bound by capillarity in the material is released and causes the polymer to foam.

Pour produire une mousse polymère sensiblement biodégradable, on utilise de l'amidon thermoplastique ou désagrégé ou un mélange polymère d'amidon thermoplastique ou désagrégé contenant au moins un polymère hydrophobe biodégradable. Le matériau est en outre mélangé avec un matériau fibreux ou capsulaire biodégradable capable de fixer l'eau par capillarité. Avant d'être mélangé au polymère, ledit matériau est au moins partiellement mélangé ou saturé avec de l'eau. Le mélange ainsi obtenu de polymère et de matériau est traité sous une pression et à une température contrôlées, de sorte que l'eau fixée par capillarité au matériau soit libérée et fasse mousser le polymère.

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