Patent ID: 8168725

Claim:
A composition suitable for reducing the molecular weight of polypropylene, propylene copolymers or polypropylene blends, which comprises a) at least one hydroxylamine ester of formula (I) wherein R a represents acyl; one of R b and R c represents hydrogen and the other one represents a substituent; or R b and R c both represent hydrogen or identical or different substituents; or R b and R c together represent oxygen; R 1 -R 4 each represent C 1 -C 6 alkyl; and R 5 and R 6 each represent independently of one another hydrogen, C 1 -C 6 alkyl or C 6 -C 10 aryl; or R 5 and R 6 together represent oxygen; and b) at least one sulphur compound of formula (II) R 1 —S-A (II) wherein R 1 represents an organic substituent and A represents hydrogen or the group wherein B + represents a cation or a cationic group.