Patent ID: 8163683

Claim:
A pour point depressant for lubricants comprising: a mixture of an alkyl (meth)acrylate polymer (A) that is composed of an alkyl (meth)acrylate containing alkyl groups having an average carbon number (C A ) of 12.5 to 13.8, and is a polymer in which, with the alkyl (meth)acrylate that composes the polymer (A) being 100% by mass, 30 to 80% by mass of the alkyl (meth)acrylate is composed of an alkyl (meth)acrylate containing alkyl groups having a carbon number of 13 or less, and an alkyl (meth)acrylate polymer (B) that is composed of an alkyl (meth)acrylate containing alkyl groups having an average carbon number (C B ) of 13.9 to 15.5, and is a polymer in which, with the alkyl (meth)acrylate that composes the polymer (B) being 100% by mass, 5 to 60% by mass of the alkyl (meth)acrylate is composed of an alkyl (meth)acrylate containing alkyl groups having a carbon number of 13 or less, wherein a relation between C A and C B satisfies Formula (1): 0.5≦ C B −C A ≦2.5 (1).