Fluoromodified polyesters having improved processability

A process for preparing molded thermoplastic manufactured articles, from compositions comprising:

• A. a polyester resin, optionally branched by means of an amount of monomers having functionality >2 and not higher than 1.5% by moles, having a crystalline phase and present in the compositions in amount by weight equal to 90-40% of the sum of the weights of components A and B;
• B. a polyester resin comprising polyoxyperfluoro-alkylene blocks, said resin being present in the compositions in amounts by weight equal to 10-60% of the sum of the weights of the components A and B, said resin being obtained by an extraction treatment of the condensation product of
• i) a non fluorinated bicarboxylic acid,
• ii) a perfluoropolyether diol, and
• iii) a non fluorinated diol, said extraction treatment comprising:
• a) heat-dissolution in 1,1,2,2-tetrachloroethane of the condensation product of the monomers and subsequent precipitation in an excess of 1,1,2-trichloro-1,2,2-trifluoroethane;
• b) filtration of the precipitated polymer and repetition of the same dissolution treatment and precipitation;
• c) recovery by filtration of the solid residue;
• the content in fluorine by weight of the resin B being comprised between 0.6 and 15% of the weight of the resin itself;
• said process comprising
• i) adding said compositions to a mold and
• ii) crystallizing said compositions in the mold;
• said compositions having a content of fluorine by weight comprised between 0.1 and 10% of the total weight of the compositions.