METHOD FOR DEWAXING MINERAL OIL COMPOSITIONS Russian patent published in 2016 - IPC C10G73/04 C10G29/02 C10G21/16 C10G29/22 C10G31/06 C10G73/22 C10G73/06 C10G73/12 C10M101/02 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method for reducing the paraffin content in mineral oil compositions, wherein the composition of mineral oils is provided with a dewaxing aid, which is a copolymer mixture obtained in a single polymerisation step, wherein the copolymers differ in the composition of the repeat units; it is cooled to form a paraffin precipitate and the paraffin precipitate is at least partly removed, where a copolymer mixture comprising at least four copolymers is used; the said four polymers have repeated units which are derived from alkylmethacrylates having 16-18 carbon atoms in the alkyl radical and repeat units that are derived from alkylacrylates with 18-22 carbon atoms in the alkyl radical, wherein the said repeat units are derived from at least one acrylate and one methacrylate. Present invention also relates to a dewaxing aid for reducing the paraffin content in mineral oil compositions, which includes is a copolymer mixture obtained in a single polymerisation step, wherein the copolymers differ in the composition of the repeat units; where the copolymer mixture is a mixture of at leat four polymers, which have repeated units which are derived from alkylmethacrylates having 16-18 carbon atoms in the alkyl radical and repeat units that are derived from alkylacrylates with 18-22 carbon atoms in the alkyl radical, wherein the said repeat units are derived from at least one acrylate and one methacrylate.

EFFECT: reduce the content of paraffins in mineral oil compositions.

9 cl, 5 tbl, 10 ex