Polyurethanes and graft mixed polymers based on polyurethane and their use for producing coating materials, adhesives and sealing masses

A graft copolymer comprising a hydrophobic core and a hydrophilic shell, wherein one of

• i) the hydrophobic core comprises a (co)polymerization product of at least one olefinically unsaturated monomer and the hydrophilic shell comprises at least one polyurathane, or
• ii) the hydrophobic core comprises at least one polyurethane, and the hydrophilic shell comprises a (co)polymerization product of at least one olefinically unsaturated monomer
• wherein the graft copolymer is prepared by a process comprising
• 1) dispersing at least one polyurethane in an aqueous medium, and
• 2) subjecting at least one olefinically unsaturated monomer to radical (co)polymerization in emulsion in the presence of the at least one polyurethane,
• wherein the at least one polyurethane comprises at least one ethenylarylene group, wherein the ethenylarylene group is at least one of pendant and terminal, and comprises a reaction product of
• (1) at least one polyurethane prepolymer containing at least one free isocyanate group, and
• (2) at least one adduct comprising a reaction product of, in a molar ratio of 1:1,
• (2.1) at least one ethenylarylene monoisocyanate, and
• (2.2) at least one of a polyol, a polyamine, and a compound containing at least one hydroxyl group and at least one amino group.

The graft copolymer of claim, 10 wherein the ethenylarylene group has the general formula II:

• CH2═C(R)—A— (II)
• wherein
• A is at least one of a substituted C6-C20 arylene radical and an unsubstituted C6-C20 arylene radical;
• and
• R is at least one of a hydrogen atom, a halogen atom, a nitride group, and a radical, wherein the radical is at least one of an alkyl, a cycloalkyl, an alkylcycloalkyl, a cycloalkylalkyl, an aryl, an alkylaryl, a cycloalkylaryl, an arylalkyl, and an arylcycloalkyl, and wherein the radical is one of substituted and unsubstituted.

A graft copolymer comprising

• A) a hydrophobic core comprising a (co)polymerization product of at least one olefinically unsaturated monomer, and
• B) a hydrophilic shell comprising at least one polyurethane,
• wherein the graft copolymer is prepared by a process comprising
• 1) dispersing at least one hydrophilic olefinically unsaturated polyurethane in an aqueous medium, wherein the hydrophilic olefinically unsaturated polyurethane contains at least one pendant ethenylarylene group and optionally at least one terminal ethenylarylene group, and
• 2) subjecting at least one hydrophobic olefinically unsaturated monomer to radical (co)polymerization in emulsion in the presence of the polyurethane.