Production and use of polymers comprising hydroxyl groups and acrylate groups

A polymer, comprising:

• a hydroxyl group, and
• an acrylate group,
• wherein the polymer is obtained in a process comprising reacting a dicarbonyl compound with a diacrylate compound, and
• the dicarbonyl compound comprises just two carbonyl groups, each independently selected from the group consisting of an aldehyde group and a keto group, bonded to one another through an aliphatic, cycloaliphatic, or aromatic hydrocarbon radical or through a single bond.