Reactive monomers as comonomers for the production of polymers

A process for lowering of a glass transition temperature of a copolymer comprising adding, during a polymerization reaction, an effective quantity, based on an entire composition of monomers used, of from 0.1 to 50% by weight, of a compound of general formula (I)

• where
• R1, R2, R3 are mutually independently, being identical or different, H or —CH3,
• X is O or C1-C4alkoxylene,
• R4 is CH2—CH2—CH2—CH2—,
• R5, R6 are mutually independently, being identical or different, H, C1-C5-alkyl, or aryl,
• R7 is H or C1-C6-alkyl, and
• n is an integer from 0 to 200.