FIELD: chemistry.
SUBSTANCE: ionomeric polyester is derived from at least one ionomeric monomer, where at least 90% of the acid units of the ionomeric polyester are derived from a group consisting of terephthalic acid, isophthalic acid, orthophthalic acid, 2,6-dimethylnaphthalene acid, and their respective dimethyl esters. The oxidisable phosphorus compound is selected from a group consisting of triphenylphosphite, trimethylphosphite, triethylphosphite, (2,4,6-tri-t-butylphenol)-2-butyl-2-ethyl-1,3-propanediol phosphite, bis (2,4-di-tert-butylphenyl)pentaerythritol diphosphite and tetrakis(2,4-di-tert-butylphenyl)-4,4-biphenyldiphosphonite. Described is a method of drying and polymerising the composition in solid state.
EFFECT: enabling use of a larger amount of oxidisable phosphorus stabiliser compared with a combination without an ionomeric polyester polymer, without affecting the dark colour of the end polymer.
11 cl, 2 tbl, 4 ex
