Patent ID: 6864313

Claim:
A process for preparing an oligomer, a cooligomer, a polymer or a copolymer (block or random) by free radical polymerization of at least one ethylenically unsaturated monomer or oligomer, which process comprises heating the monomer, monomers, oligomer or oligomers in the presence of a free radical source and at least one compound of formula (I) and polymerizing the ethylenically unsaturated monomer or oligomer, where no compression step is applied to the ethylenically unsaturated monomer, monomers, oligomer or oligomers prior to polymerization, and where the compound of formula (I) is where n is 1 or 2; R 3 , R 4 , R 9 , R 10 are each independently of one another C 1 -C 18 alkyl, C 2 -C 18 alkenyl or C 2 -C 18 alkinyl; or R 3 and R 4 and/or R 9 and R 10 form together with the linking carbon atom a C 3 -C 12 cycloalkyl radical; R 5 , R 6 , R 7 , R 8 are each independently of one another hydrogen, C 1 -C 18 alkyl, C 2 -C 18 alkenyl or C 18 alkinyl; X is —O—, —O—C(O)—, —NR 2 — or —NR 2 —C(O)—; R 2 is hydrogen, C 1 -C 18 alkyl or phenyl; if n is 1, R 1 is C 8 -C 38 alkyl, C 8 -C 36 alkenyl or C 8 -C 36 alkinyl; and if n is 2, R 1 is C 10 -C 38 alkylene, C 10 -C 36 alkenylene or C 10 -C 36 alkinylene.