Patent ID: 7977429

Claim:
A polymer having at least a structural unit represented by the following Formula (1): wherein A is a polymer of ethylene or propylene, the polymer having a weight average molecular weight of 400 to 500,000; R is a hydrogen atom, or an alkyl group or aralkyl group having 1 to 18 carbon atoms; W and Z are each independently an oxygen atom, an NH group or a sulfur atom; and x and y are each 0 or 1, with the proviso that at least one of them is 1, wherein the polymer having at least a structural unit represented by the formula (1) contains a structural unit represented by Formula (2): wherein A and R are as defined in Formula (1); and n is an integer of 1 or greater, and at least one structural unit selected from the group consisting of structural units represented by Formula (5) and Formula (6): wherein X is an oxygen atom or an NH group; and R 3 is a divalent hydrocarbon group having 1 to 20 carbon atoms which may contain heteroatoms; and wherein R 4 is a divalent hydrocarbon group having 1 to 20 carbon atoms which may contain heteroatoms.