PROCESS OIL AND PROCESS FOR PRODUCING THE SAME

摘要

A process oil comprising a 95/5 to 5/95 by weight mixture of: an extract having a DMSO extractable content less than 3 wt.% obtained by solvent−extracting an oil obtained by deasphalting a vacuum distillation bottom; and either a mineral oil base having a DMSO extractable content less than 3 wt.% which is a raffinate obtained by the solvent purification of a vacuum distillation fraction or a mineral oil base having a DMSO extractable content less than 3 wt.% obtained by subjecting a raffinate obtained by the solvent purification of a vacuum distillation fraction to hydrofining and/or dewaxing. The process oil has a dynamic viscosity at 100°C of less than 32 mm2/s, %CA of 15 to 30, aniline point of 100°C or lower, weight change through evaporation of 0.5% or less, and mutagenicity index less than 1.