Patent ID: 8461271

Claim:
A graft copolymer having a structure in which an unsaturated group of a chain terminal and/or a principal chain pendant in a reactive polyolefin having 0.5 or more terminal unsaturated groups per molecule and comprising at least one monomer selected from α-olefins having 2 to 28 carbon atoms is introduced into a copolymerized chain derived from at least one monomer selected from the following group A and at least one monomer selected from the following group B and satisfying the following conditions (a) to (c): group A: [V] maleic anhydride and substitution products thereof, [VI] maleic anhydride and esters thereof and [VII] maleimide and substitution products thereof and group B: [I] acrylic acid and derivatives thereof, [II] methacrylic acid and derivatives thereof, [III] vinyl esters and derivatives thereof, [IV] styrene and derivatives thereof and [VIII] α-olefins, (a) a graft rate is 1.5 to 150% by mass, (b) a limiting viscosity [η] which is measured in decalin at 135° C. is 0.01 to 2.5 dl/g and (c) a molecular weight distribution (Mw/Mn) is 1.8 to 6.