Organomodified polysiloxanes and their use for defoaming fuels

An organomodified polysiloxane of formula (I),

• in which
• R in each case independently is selected from the group consisting of hydrocarbon radicals;
• R1 in each case independently is selected from the group consisting of R, R2 and R3;
• R2 in each case independently is selected from the group consisting of polyether radicals of formula (II),
• —Z1(OC2H4)d(OC3H6)e(OC4H8)f(OC2H3Ph)gOR4 formula (II),
• Z1 in each case independently is selected from the group consisting of divalent aliphatic hydrocarbon radicals having 2 to 10 carbon atoms;
• Ph is a phenyl radical;
• R4 in each case independently is selected from the group consisting of a hydrogen radical, alkyl radicals having 1 to 4 carbon atoms and acyl radicals having 1 to 4 carbon atoms;
• R3 in each case independently is selected from the group consisting of radicals of formula (III),
• Z2 in each case independently is selected from the group consisting of divalent aliphatic hydrocarbon radicals having 2 to 10 carbon atoms;
• R5 in each case independently is selected from the group consisting of a hydrogen radical, a hydroxy group, alkyl radicals having 1 to 4 carbon atoms, and alkoxy radicals having 1 to 4 carbon atoms, with the proviso that at least one radical R5 is a hydroxy group;
• wherein:
• a=50 to 960;
• b=4 to 85;
• c=0.5 to 10;
• d=0 to 60;
• e=0 to 60;
• f=0;
• g=0 to 60;
• with the proviso that:
• d+e+f+g=1 to 60;
• and
• a /(b+c) is greater than 7.