Graft copolymers, their preparation and their use

A process for preparing a reaction product (RP) functionalized by groups containing halogen or sulfonyl chloride by reaction of the following components under free-radical conditions:

• a) at least one free-radically polymerizable monomer as component (A),
• b) at least one compound of the formula (I) as component (B)
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• where R1 to R4 are each, independently of one another, hydrogen, an in each case unsubstituted or substituted alkyl radical, cycloalkyl radical or an aralkyl radical or an unsubstituted or substituted aromatic hydrocarbon radical, with the proviso that at least two of the radicals R1 to R4 are unsubstituted or substituted aromatic hydrocarbon radicals or the radicals R1 and R2 or R3 and R4 in each case in pairs are a substituted or unsubstituted aromatic hydrocarbon having from 6 to 18 carbon atoms and bearing a functional group which has a multiple bond between a carbon atom and a heteroatom which is conjugated with the C—C double bond in the formula (I),
• c) at least one free-radical initiator as component (C).
• d) at least one free-radically polymerizable monomer containing halogen or sulfonyl chloride groups as component (D).