MIXTURES OF ADDITIVES FOR MODIFYING RHEOLOGICAL PROPERTIES OF POLYMERS Russian patent published in 2025 - IPC C07D251/34 C07C333/08 C07D251/28 C07D493/10 C08K5/3435 C08K5/39 C08L23/00 C08L23/12 D01F11/04 D01F1/10 D01F6/04 

FIELD: chemistry.

SUBSTANCE: present invention relates to a composition for modifying rheological properties of polymer substrates, as well as to fibre and nonwoven material containing said composition. Composition includes (a) a compound of formula or , where G1-G₆, G₁'-G₆', X, X', R₁, R₁' and m are defined in cl. 1 of the claims, (b) a compound of formula, in which A is based on an organic isocyanate, wherein radical (s) -S- and -R are introduced by reaction with isocyanate groups, R is alkyl with 2–40 carbon atoms, which is optionally substituted and/or interrupted by -O-, -NH-, -S- and/or carbonyl group, n is equal to or greater than 1, and (c) a polymer substrate.

EFFECT: composition enables more effective modification of polymer substrates by changing rheological properties (viscosity breaking, long-chain branching, cross-linking), which improves mechanical properties, barrier properties, process properties and processing of polymers.

18 cl, 12 tbl, 69 ex