Patent ID: 7348451

Claim:
A method for inhibiting gas hydrate formation in a mixture of hydrocarbon and water, said method comprising adding to the mixture a compound of formula (1) where R 1 , R 2 are each independently C 1 - to C 22 -alkyl, C 2 - to C 22 -alkenyl, C 6 - to C 30 -aryl or C 7 - to C 30 -alkylaryl, R 3 is C 1 - to C 22 -alkyl, C 2 - to C 22 -alkenyl, C 6 - to C 30 -aryl or C 7 - to C 30 -alkylaryl, —CHR 5 —COO — or —O — , R 4 is M, hydrogen or an organic radical which optionally contains heteroatoms and has from 1 to 100 carbon atoms, B is a straight chain or branched substituted C 1 - to C 30 -alkylene group, D is a radical of the formula (4) where A is a C 2 - to C 4 -alkylene group which may be straight-chain or branched, m and n are each independently a number in the range from 0 to 30, X, Y are each independently 0 or NR 6 , R 5 , R 6 are each independently hydrogen, C 1 - to C 22 -alkyl, C 2 - to C 22 -alkenyl, C 6 - to C 30 -aryl or C 7 - to C 30 -alkylaryl, and M is a cation.