Patent ID: 8658069

Claim:
A process for producing a shrink film comprising mixing components A), B), and C) to produce a polymer mixture and blown film extruding the polymer mixture while choosing a blow-up ratio from 2:1 to 3:1, wherein A) from 45 to 70% by weight of a biodegradable, aliphatic-aromatic polyester obtained via condensation of: i) from 40 to 70 mol %, based on components i to ii, of one or more dicarboxylic acid derivatives or dicarboxylic acids selected from the group consisting of: succinic acid, adipic acid, sebacic acid, azelaic acid, and brassylic acid, wherein the dicarboxylic acid derivatives are di-C 1 -C 6 -alkyl esters; ii) from 60 to 30 mol %, based on components i to ii, of a terephthalic acid di-C 1 -C 6 -alkyl ester; iii) 98 to 102 mol %, based on components i to ii, of a C2-C8 alkylenediol or C2-C6 oxyalkylenediol; iv) from 0.00 to 2% by weight, based on the total weight of components i to iii, of a chain extender and/or crosslinking agent selected from the group consisting of: a di- or polyfunctional isocyanate, isocyanurate, oxazoline, epoxide, and carboxylic anhydride, and/or an at least trihydric alcohol, or an at least tribasic carboxylic acid; and B) from 30 to 55% by weight of polylactic acid and C) from 0 to 2% by weight of a compatibilizer.