Polymer composition comprising polyacrylic block copolymer and aromatic based polyalkyleneoxide as dispersant

A polymer composition comprising

• a) at least one polyacrylic block copolymer in the range from 10 to 90 wt % based on the total weight of the composition,
• wherein the at least one polyacrylic block copolymer is obtainable by reacting
• i) polymer (A) obtained by controlled free radical polymerization of at least one acrylate monomer selected from C1-C6 alkyl esters of acrylic acid, C1-C6 alkyl esters of methacrylic acid, hydroxy C1-C6 alkyl esters of acrylic acid and hydroxy C1-C6 alkyl esters of methacrylic acid,
• in the presence of either a1 or a2,
• wherein
• a1 is at least one nitroxylether of formula (I)
• R1R2NOX (I), and
• a2 is at least one stable free nitroxyl radical of formula (II)
• R1R2NO· (II);
• wherein
• R1 and R2 are independently selected from substituted or unsubstituted, linear or branched C5-C18 alkyl, or R1 and R2 together with the nitrogen atom to which they are attached form an unsubstituted or substituted 5- to 10-membered aliphatic ring comprising 1 to 3 heteroatom(s) selected from nitrogen and oxygen, and
• X is selected from —CH2-phenyl, —CH(CH3)-phenyl, —C(CH3)2-phenyl, —(C5-C6 cycloalkyl)2C—CN, —(CH3)2CCN, —CH2CH═CH2, —CH3CH—CH═CH2, —(C1-C4alkyl)CR3—(O)-phenyl, —(C1-C4)alkyl-CR3—(O)—(C1-C4)alkoxy, —(C1-C4)alkyl-CR3—(O)—(C1-C4)alkyl, —(C1-C4)alkyl-CR3—(O)—N-di(C1-C4)alkyl, —(C1-C4)alkyl-CR3—(O)—NH(C1-C4)alkyl, and —(C1-C4)alkyl-CR3—(O)—NH2, wherein R3 is hydrogen or (C1-C4)alkyl;
• with
• ii) at least one ethylenically unsaturated monomer selected from a C5-C20 vinylaromatic, an ethylenically unsaturated nitrile, acrylamide, a vinyl halide, a vinyl ether of an C1-C10 alcohol and an C2-C8 aliphatic hydrocarbon having one or two double bonds;
• and
• b) at least one aromatic based polyalkyleneoxide in the range from 10 to 90 wt % based on the total weight of the composition,
• wherein the at least one aromatic based polyalkyleneoxide is obtainable by reacting
• (i) at least one monoamine functionalized polyalkyleneoxide of formula (III)
• T-(O—P)n—NH2 (III)
• wherein P is a substituted or unsubstituted, linear or branched C1-C4 alkylene, or a mixture of C1-C4 alkylene, and
• T is selected from substituted or unsubstituted, linear or branched C1-C22 alkyl, substituted or unsubstituted C1-C24 alkylaryl, and substituted or unsubstituted C1-C24 dialkylaryl and n is an integer in the range of 1 to 150;
• with
• (ii) at least one aromatic compound of the formula (IV)
• wherein
• Q is a chemical bond or a divalent moiety selected from —O—, —NH— and —S—,
• A is an unsubstituted or substituted aromatic group selected from the formula
• wherein # indicates the point of attachment to the rest of the molecule, and
• q is 0, 1, 2, 3 or 4,
• R is independently selected from halogen, NO2, OH, C1-C4-alkyl, C1-C4-alkoxy, CONH2, NH—CHO, NH—C1-C4-alkyl, and NH—(C═O)—C1-C4-alkyl.