Polyalkylene oxide ester polymer, its preparation and use

A polyalkylene oxide ester polymer with a weight average molecular weight Mw in the range of from 500 to 50,000 g/mol and a polydispersity PD in the range of from 2 to 6, comprising 10 to 560 ether groups and 2 to 51 ester groups, which are interconnected with alkylene groups, wherein the polyalkylene oxide ester polymer contains

• A) 1 to 51 structural elements of the general formula (I)
• wherein
• the —O— unit at the left side is bound to a —CO— unit of an adjacent unit of the polymer, forming an ester unit,
• the —CO— unit at the right side is bound to a —O— unit of an adjacent unit of the polymer, forming a further ester unit,
• R1, R2, R3, R4, and R5 represent independent of each other a hydrogen atom or a C1-12 alkyl group,
• a, b, c, d, and e represent independent of each other an integer of 0 or 1, whereas the sum of a, b, c, d, and e is 1 to 5, and
• X represents a polyalkylene oxide unit with 4 to 100 alkylene oxide units, whereby wherein the alkylene oxide units contain independent of each other 2 to 6 carbon atoms in the direct chain between two —O— units, wherein each of the carbon atoms in the direct chain between two —O— units contains independent of each other either two hydrogen atoms, or one hydrogen atom and one C1-12 alkyl group,
• B) 1 to 25 structural elements of the general formula (II)
• wherein
• the —CO— unit at the left side is bound to a —O— unit of an adjacent unit of the polymer, forming an ester unit,
• the —CO— unit at the right side is bound to a —O— unit of an adjacent unit of the polymer, forming a further ester unit,
• R7, R8, R9, R10, R11, R13, R14, R15, R16, and R17 represent independently of each other a hydrogen atom or a C1-12 alkyl group,
• g, h, i, j, k, m, n, o, p, and q represent independent of each other an integer of 0 or 1, whereas the sum of g, h, i, i, and k is 1 to 5, and the sum of m, n, o, p, and a is 1 to 5, and
• Y represents a polyalkylene oxide unit with 0 to 99 alkylene oxide units, whereby wherein the alkylene oxide units contain independent of each other 2 to 6 carbon atoms in the direct chain between two ether groups, wherein each of the carbon atoms in the direct chain between two ether groups contains independent of each other either two hydrogen atoms, or one hydrogen atom and one C1-12 alkyl group, and
• C) polyalkylene oxide units of the general formula (III) in a number suitable to form ester bonds with the —CO— units of the structural elements of the formulas (I) and (II)
• wherein
• the —O— unit at the left side is bound to a —CO— unit of an adjacent unit of the polymer, forming an ester unit,
• the —O— unit at the right side is bound to a —CO— unit of an adjacent unit of the polymer, forming a further ester unit,
• R19, R20, R21, R22, R23, and R24 represent independently of each other a hydrogen atom or a C1-12 alkyl group,
• s, t, u, v, w, and x represent independent of each other an integer of 0 or 1, whereas the sum of s, t, u, v, w, and x is 2 to 6, and
• Z represents a polyalkylene oxide unit with 0 to 100 alkylene oxide units, whereby wherein the alkylene oxide units are independent of each other and contain 2 to 6 carbon atoms in the direct chain between two ether groups, wherein each of the carbon atoms in the direct chain between two ether groups contains independent of each other either two hydrogen atoms, or one hydrogen atom and one C1-12 alkyl group,
• with the proviso that the total number of the ester groups does not exceed the maximum number of the ester groups specified for the polyalkylene oxide ester polymer.