Patent ID: 8920543

Claim:
A gas hydrate inhibitor comprising copolymers containing A) 1 to 99 mol % of structural units of the formula (1) in which R 1 is hydrogen or C 1 -C 6 -alkyl, A is a C 2 -C 4 -alkylene group and B is a C 2 -C 4 -alkylene group, with the proviso that A is different than B, and x, y are each independently an integer of 1-100, and B) 1 to 99 mol % of structural units of the formula (3) in which R 6 is hydrogen or C 1 -C 6 -alkyl, D is a C 2 -C 4 -alkylene group and z is an integer of 1-50, in amounts of 0.01 to 2% by weight, based on the water phase.