FIELD: chemistry.
SUBSTANCE: composition, which is catalysed by aluminium or one or more alkali-earth metals, or alkali metals to which a titanium compound is added, contains: a thermoplastic polyester polymer and a) at least one aluminium and a compound thereof, which form an aluminium cation, b) at least one alkali or alkali-earth metal and a compound of an alkali or alkali-earth metal, which form their cations, and c) particles containing titanium nitride. The particles are present in amount ranging from 1 ppm to 50 ppm of the total weight of the polyester composition and have average particle size ranging from 1 nm to 500 nm. The composition is obtained via polycondensation of molten polyester polymer in the presence of aluminium atoms and at least one atom of an alkali-earth or alkali metal. Further, titanium nitride particles are added to the polymer. A bottle preform is made from the polyester composition.
EFFECT: polymer and articles made from the polyester composition have excellent transparency and colour in addition to high rate of reheating and neutralisation of the yellow tint of the ready polymer.
29 cl, 1 tbl, 2 ex
