FIELD: chemistry.
SUBSTANCE: invention relates to polyether polymers. Described is a polyether polymer, which includes at least one polyethylene terephthalate polyether, at least one compound, containing an alkali metal and aluminium; and from 5 to 350 parts per mln of at least one phenolic stabiliser in a combination with a phosphoric acid, where the compound, containing the alkali metal and aluminium, represents at least one of the compounds, containing lithium and aluminium, and where the phenolic stabiliser represents pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. Also described are versions of the polyether polymer, including (a) at least one polyethylene terephthalate polyether, which includes (i) a residue of at least one carboxylic acid, where at least 90 mol% of the said residue are the residue of a terephthalic acid, relative to 100 mol% of the residue of at least one acid component, (ii) a residue of at least one hydroxyl component, where at least 90 mol% of the said residue are the residue of ethylene glycol, relative to 100 mol% of the residue of at least one hydroxyl component, and (iii) up to 10 ml% of the residue, selected from the residue of an isophthalic acid, residue of a naphthalenedicarboxylic acid, diethylene glycol residue, residue of 1,4-cyclohexanediole and residue of their derivatives, (b) at least one compound, containing lithium and aluminium; and (c) from 200 to 300 parts per mln of pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] in the combination with the phosphoric acid. A product, including at least one polyether polymer, described above, is described. Described is a method, realised in a melt phase in order to obtain the polyether polymer product in the melt phase, which includes obtaining a suspension, which contains at least one glycol, selected from ethylene glycol and ethylene glycol derivatives, as well as minimum one acid, selected from the terephthalic acid and terephthalic acid derivatives, an addition from 5 to 350 parts per mln of at least one phenolic stabiliser, selected from pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and the phosphoric acid; and realisation of interaction of the said at least one glycol and the said at least one acid in the presence of at least one catalyst, selected from the catalyst, containing the alkali metal and aluminium, where the catalyst is selected from lithium-aluminium-containing catalysts.
EFFECT: obtaining the polyether polymer, possessing higher oxidation stability.
11 cl, 7 dwg, 13 tbl, 5 ex
