Derivatives of tris(2-hydroxyphenyl)methanes, preparation thereof and use thereof for mineral oil production

A derivative of tris(2-hydroxyphenyl)methanes, wherein the derivative is a compound of the general formula (I)

• where the R1, R2 and R radicals are each defined as follows:
• R:
• each independently 0 to 4 C1- to C30-hydrocarbyl radicals per phenyl ring,
• R1:
• a radical selected from the group of H, OH, F, Cl, Br, I and C1- to C30-hydrocarbyl groups,
• R2:
• each independently radicals of the general formula
• -(—R5—O—)n—R6—X (III),
• where R5, R6, X, m and n are each independently defined as follows:
• n:
• a number from 1 to 50,
• R5:
• each independently groups of the general formula
• —CH2—CH(R7)—(—H2)m— (VI),
• where m is 0 or 1 and R7 is a radical selected from the group consisting of H, C1- to C6-hydrocarbyl groups, and oxygen-containing functional groups selected from the group consisting of —OH, —CH2OH, —CH2OR11, and polyalkoxy groups optionally comprising a terminal OH group, wherein R11 is a hydrocarbyl radical,
• R6:
• a single bond or an alkylene group which has 1 to 10 carbon atoms and may optionally have functional groups as substituents,
• X:
• H or a hydrophilic group,
• wherein the compound (I) comprises at least one R5 radical of the general formula
• —CH2—CH(R7a)— (IVa)
• where R7a is a group selected from the group of —COOR8 and —CH2—O—(—CH2—CH(R9)—O—)z—R10, and R8, R9, R10 and z are each defined as follows:
• R8:
• H, an a-valent ion of the general formula 1/a Ma+, where a=1, 2 or 3 or a hydrocarbyl group having 1 to 6 carbon atoms,
• R9:
• H or a hydrocarbyl group having 1 to 6 carbon atoms,
• R10:
• H or a hydrocarbyl group having 1 to 6 carbon atoms, and
• z:
• a number from 1 to 20.