Modified (co)polymer, method for preparing thereof and use of the same

A method for preparing a modified diene-containing copolymer, comprising the following steps of:

• a) dissolution, wherein a starting diene-containing (co)polymer is dissolved in an organic solvent;
• b) modification, wherein the modification is carried out by adding components of a modifying system to the solution of the starting diene-containing (co)polymer in the organic solvent, obtained in step (a);
• c) neutralization and separation, wherein an aqueous solution of a neutralizing agent is added to the reaction mass obtained in step (b), followed by separating an aqueous layer and an organic layer;
• d) precipitation, wherein the modified diene-containing (co)polymer is precipitated by adding an excess of an alcohol-precipitant to the organic layer;
• and
• e) isolation, wherein the precipitated modified diene-containing (co)polymer is filtered and then dried,
• characterized by using, as the modifying system in modification step (b), a mixture of halogen and water in a ratio of halogen to water of from 1:0.01 to 1:1 based on the total number of double bonds in the starting diene-containing (co)polymer.