POLYOLEFIN COMPOSITION WITH HIGH WATER RESISTANCE AND CONTAINING ClO Russian patent published in 2011 - IPC C08L23/02 C08L23/04 C08K5/13 C08K5/3435 C08K5/372 F16L9/12 

FIELD: chemistry.

SUBSTANCE: invention relates to use of an antioxidant to increase resistance of a polyolefin composition meant for making pipes to decomposition caused by contact with water, which contains CIO₂. The antioxidant is selected from a) a group of phenols of formula I, where R is an unsubstituted or substituted aliphatic or aromatic hydrocarbon radical which can contain heteroatoms, or R is a heteroatom, R' and R" independently denote an unsubstituted or substituted hydrocarbon radical which can contain heteroatoms, or H, X₁, X₂ and X₃ independently denote an unsubstituted or substituted hydrocarbon radical which can contain heteroatoms, or H or OH, where at least X₁, X₂ or X₃ is OH, n assumes values from 1 to 4, and at least one of the phenol substitutes R, R' and/or R" contains at least one sulphur, phosphorus and/or nitrogen heteroatom or from b) amine compounds of formula II, where R¹, R², R³, R⁴, R⁵ and R6 independently denote a hydrogen atom or an aliphatic or aromatic hydrocarbon radical, possibly containing heteroatoms, or selected from c) sulphur-containing compounds of formula R^a-S-R^b III, where R^a and R^b independently denote an aliphatic or aromatic hydrocarbon radical, possibly containing heteroatoms.

EFFECT: antioxidant used has low susceptibility to extraction with water carried by a pipe made from such a polyolefin composition.

7 cl, 1 tbl, 2 ex