MIXTURE OF BLOCK-POLYMERS, METHOD OF ITS PREPARING AND USE AND COMPOSITION CONTAINING THIS MIXTURE Russian patent published in 2001 - IPC

FIELD: organic chemistry, polymers. SUBSTANCE: invention relates to a mixture of block-polymers containing at least three different compounds of the formula (I) characterizing by n value where n = 3-15; R₁ means hydrogen atom or C₁-C₈-alkyl; R₂ means C₂-C₁₂-alkylene; A means -N-(R₅)(R₅) or group of the formula (II) ; R₄ and R₅ mean hydrogen atom, C₂-C₁₈-alkyl or C₂-C₄-alkyl substituted with group OH-, C₂-C₈- alkoxy-group, or -N-(R₄)(R₅) means group of the formula (III) ; Y means -O-; X means >N-R₆; R₆ means C₁-C₁₈-alkyl or group of the formula (IV) ; R= R₆; B = A and in individual structural units of compound of the formula (I) radicals B, R, R₁ and R₂ have similar or different values. Index characterizing the polydispersity of mixture is from 1.1 to 1.7. Invention describes also method of preparing the mixture that involves three stages. Invention describes also method of stabilization of synthetic polymer against destruction induced by heat, light or oxidation by addition to polymer a mixture of block-polymers of this invention and the composition containing synthetic polymer and this mixture. EFFECT: enhanced resistance of synthetic polymer to effect of heat, light and oxidation. 30 cl, 15 dwg, 7 tbl