Patent ID: 8268762
Filing Date: 2012-09-18
Classification: C10M,C10N

Abstract:
1. A transmission fluid composition comprising, as a base oil, at least one selected from the group consisting of an α-olefin oligomer and an α-olefin oligomer hydrogenation product, wherein the α-olefin oligomer and the α-olefin oligomer hydrogenation product are at least one species selected from the group consisting of: (A) a C16 to C40 α-olefin oligomer which has been produced through oligomerization of a C2 to C20 α-olefin in the presence of a metallocene catalyst, and which satisfies formula (II): wherein p, q, and r each are an integer of 0 to 18, n is an integer of 0 to 8, p+n×(2+q)+r is 12 to 36, and when n is ≧2a plurality of q's in individual repeating units may be identical to or different from one another; (B) a hydrogenation product of the α-olefin oligomer (A) which satisfies formula (III): wherein a, b, and c each are an integer of 0 to 18, m is an integer of 0 to 8, a+m×(2+b)+c is 12 to 36, and when m is ≧2 a plurality of b's in individual repeating units may be identical to or different from one another; (C) a C16 to C56 α-olefin oligomer which has been produced through dimerization of a C2 to C20 α-olefin in the presence of a metallocene catalyst, to thereby form an α-olefin dimer having a vinylidene bond, and through further dimerization of the α-olefin dimer in the presence of an acid catalyst, and which satisfies formula (IV) or (V): wherein R 1 to R 4 each represent a hydrogen atom or a C1 to C18 linear or branched alkyl group, and the total number of carbon atoms in R 1 to R 4 is 8 to 48; (D) a hydrogenation product of the α-olefin oligomer (C) which satisfies formula (VI): wherein R 1 to R 4 each represent a hydrogen atom or a C1 to C18 linear or branched alkyl group, and the total number of carbon atoms in R 1 to R 4 is 8 to 48; (E) a C16 to C40 α-olefin oligomer which has been produced through dimerization of a C2 to C20 α-olefin in the presence of a metallocene catalyst, to thereby form an α-olefin dimer having a vinylidene bond, and through addition of a C6 to C8 α-olefin to the α-olefin dimer in the presence of an acid catalyst, and which satisfies formula (VII): wherein R 5 represents a C4 to C6 alkyl group; R 6 and R 7 each represent a hydrogen atom or a C1 to C18 alkyl group, and the total number of carbon atoms in R 5 to R 7 is 10 to 34; and (F) a hydrogenation product of the α-olefin oligomer (E) which satisfies formula (VIII): wherein R 5 represents a C4 to C6 alkyl group; R 6 and R 7 each represent a hydrogen atom or a C1 to C18 alkyl group, and the total number of carbon atoms in R 5 to R 7 is 10 to 34; and wherein said transmission fluid composition has a kinematic viscosity as determined at 100° C. of 2 to 10 mm wherein X represents a kinematic viscosity (mm 2 /s) as determined at 100° C., and Y represents a NOACK evaporation loss amount (mass %) at 200° C. for one hour, and wherein the metallocene catalyst is a metallocene complex comprising a Group 4 element and aluminoxane.