	US 7,601,253 B2
	Process oil and process for producing the same
Takashi Kaimai, Toda (Japan); Yoshiyuki Morishima, Toda (Japan); and Kenji Fujino, Toda (Japan)
Assigned to Japan Energy Corporation, Tokyo (Japan)
Appl. No. 10/491,060 PCT Filed Sep. 30, 2002, PCT No. PCT/JP02/10140 § 371(c)(1), (2), (4) Date Mar. 03, 2006, PCT Pub. No. WO03/031537, PCT Pub. Date Apr. 17, 2003.
Claims priority of application No. 2001-306009 (JP), filed on Oct. 02, 2001.
Prior Publication US 2006/0254955 A1, Nov. 16, 2006
Int. Cl. C07C 7/10 (2006.01); C10M 101/02 (2006.01)

U.S. Cl. 208—19 [208/309; 208/314; 208/322; 524/484; 585/1; 585/13]

7 Claims

1. A process oil comprising, in a mixing ratio of 95/5 to 5/95 (extract/mineral base oil mass):

(i) an extract obtained by solvent refining of a deasphalted oil of a vacuum distillation residue, having a DMSO extractable content of less than 3 mass %; and

(ii) a mineral base oil comprising a raffinate obtained by solvent refining of a vacuum distillate, or a mineral base oil obtained by hydrorefining and/or dewaxing of a raffinate obtained by solvent refining of a vacuum distillate, those mineral base oils having a DMSO extractable content of less than 3 mass %, a kinematic viscosity of 4 to 20 mm²/s at 100° C., a % C_Aof 3 to 20, an aniline point of 120° C. or lower, and an aromatic hydrocarbon content of 10 mass % or higher as determined by chromatography;

wherein the process oil has a kinematic viscosity of less than 32 mm²/s at 100° C., a % C_Aof 15 to 30, an aniline point of 100° C. or lower, an evaporation mass variation percentage of 0.5% or lower, and a mutagenicity index of less than 1.