Process for producing biodegradable thin-walled starch-based...

Details Process for producing biodegradable thin-walled starch-based... Process for producing biodegradable thin-walled starch-based...

C - Chemistry, Metallurgy

08

J

C08J 7/04 (2006.01) B05D 7/02 (2006.01) B65D 3/00 (2006.01) C08L 3/02 (2006.01) C09D 101/10 (2006.01) C09D 101/28 (2006.01) C08L 93/02 (2006.01) C08L 93/04 (2006.01)

Patent

CA 2150929

The invention relates to a process for applying a water-repellent or waterproof coating to at least one side or the inside of mouldings obtained by baking starch-containing between two halves of a mould or by extrusion, in which, at the same time as a lacquer is applied which, in addition to one or more physiologically and/or ecotoxicologically acceptable low-boiling-point solvents miscible with water, contains one or more biodegradable hydrophobic film-forming substances and one or more biodegradable hydrophobic softeners, at least part of the adsorbed hydration water is removed from the surface layer of the moulding to be coated and then the solvent (mixture) is removed while maintaining at least 5% wt. moisture content in the substrate until there is no remaining odour. The film-forming substances may be hydrophobic alkyl celluloses, hydrophobic water-insoluble cellulose esters from the group including cellulose acetal butyrates, cellulose acetal propionates and cellulose acetates, and the softener may be hydrophobic triglycerides of medium and long-chained fatty acids (chains longer than or equal to C4), triglycerides with shorter-chained partial substitution if there is at least one fatty acid with a chain length of C14 or over, phthalic acid esters, acyclic dicarboxylic acid esters, fully esterified citric acid esters, saccharose acetate isobutyrate and other hydrophobic sugar esters.

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