Patent ID: 8741979

Claim:
A process for producing siloxane copolymers having urethanesulfonamido groups, comprising: reacting in a first step, an organic polymer (1), which has at least one hydroxyl group, with an isocyanate (2) of the formula (I) O═C═N—SO 2 X (I) wherein X is a halogen atom or a pseudohalogen radical, with the proviso that the isocyanate is used in an amount of 0.8 to 1.0 mol of O═C═N— groups per mole of hydroxyl group (—OH) in (1), and reacting, in a second step an organic polymer (3), which is obtained from the first step and has at least one group of the formula —O—C(═O)—NH—SO 2 X, with an organopolysiloxane (4), which has at least one primary or secondary amino group (—NH—), with the proviso that the organopolysiloxane (4) is used in amounts of 1.2 to 4.0 mol of amino group (—NH—) per mole of —SO 2 X in isocyanate (2).