TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The carboxyl end group of polyester is present at greater than 3 mmol/kg. The epoxidized fatty acid glyceride glycerol ester has greater than 80 wt.% and a structure of formula (CH2OR1-CHOR2-CH2OR3) (A). The epoxidized fatty acid ester (greater than 90 wt.%) has a structure of formula (R4OR5) (B). The acid number of the hydrolysis stabilizers is less than 10 mg of potassium hydroxide/g (DIN EN ISO 3682). The hydrolysis stabilizer contains epoxide oxygen content of 1 wt.%. The epoxidized fatty acid glyceride is epoxidized soybean oil, epoxidized linseed oil, epoxidized rapeseed oil, epoxidized sunflower oil or epoxidized fish oil. The epoxidized fatty acid ester is 2-ethylhexyl esters of unsaturated fatty acids or fatty acid mixtures of rapeseed oil, linseed oil, soybean oil or fish oil underlying fat. The amount of fatty acid glyceride in the total hydrolysis stabilizer content is greater than 50 wt.%. The chain extender is difunctional or polyfunctional epoxide having at least one terminal end of the molecular chain or a side chain arranged epoxide group. The chain extender is substituted cyclopentane compound of formula (C). The chain extender is present at less than 2 wt.% to at least 0.1 wt.%, based on the film. In formula (A):R1-R3 = cyclopropane groups of formula (a);R1E = CH3 or H;m = 1-40;n = 0-10; ando = 0-4.(where the residue of R1-R3 with m is 0 in glycerol ester mixtures for less than 30 wt.% (based on the total weight of the glycerol esters)). In formula (B):R4 = (A);R5 = -(CH2)s-R6 or O-R4;R6 = H, OH or CtH(2t+1);s = 0-50; andt = 3-10.In formula (C):R7 = H or aliphatic or aromatic organic group; andR8 = aliphatic or aromatic organic group.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The chain extender is a polymer having a structure of formula (D).R9-R13 = H or 1-12C alkyl;R14 = 1-12C alkyl;x, y = 0-100 (where x+y are greater than 0); andz = 2-100. EXAMPLE - Typical composition comprised (in wt.%) of: polyethyleneterephthalate (60); titanium dioxide (36); epoxidized linseed oil (3); 2-hexylethylester of linseed oil (0.4); and Joncryl 4380 (RTM: High-epoxy functionality for liquid acrylic resin) (0.6).