Patent ID: 8124702

Claim:
A stabilizer for a polyolefin resin, comprising a copolymer (A) which is obtained by polymerizing an unsaturated monomer mixture comprising 1 to 50 parts by mass of at least one ethylenically unsaturated monomer (a) represented by the following general formula (I) and having a piperidyl group in a molecule, 50 to 99 parts by mass of at least one monomer (b) selected from the group consisting of isobutyl methacrylate and an alkyl (meth)acrylate having an alkyl group with 6 to 13 carbon atoms, and 0 to 15 parts by mass of at least one ethylenically unsaturated monomer (c) other than the monomers (a) and (b), with the proviso that the total of the monomers (a), (b), and (c) is 100 parts by mass and monomer (b) comprises at least 50 parts by mass of at least one monomer selected from the group consisting of isobutyl methacrylate, 2-ethylhexyl acrylate and p-tertiary-butylcyclohexyl acrylate: wherein R 1 represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, X represents an oxygen atom or an imino group, Y represents a hydrogen atom or an alkyl or alkoxyl group each having 1 to 20 carbon atoms, and Z represents a hydrogen atom or a cyano group.