(19)

(11)

EP 3 555 249 A1

(12)

(43) Date of publication: 23.10.2019 Bulletin 2019/43 (21) Application number: 17816809.2 (22) Date of filing: 14.12.2017

(51) International Patent Classification (IPC):  C10M 169/04(2006.01) (86) International application number: PCT/EP2017/082926 (87) International publication number: WO 2018/109125 (21.06.2018 Gazette 2018/25)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: MA MD TN (30) Priority: 16.12.2016 WO PCT/CN2016/110333 (71) Applicant: Castrol Limited Reading RG8 7QR (GB)	(72) Inventors: LAMB, Gordon David Pangbourne Reading RG8 7QR (GB) REDSHAW, John Michael Pangbourne Reading RG8 7QR (GB) WEST, Kevin Richard Pangbourne Reading RG8 7QR (GB) YATES, Rebecca Pangbourne Reading RG8 7QR (GB) (74) Representative: BP Global Patents  BP International Limited Global Patents & Technology Law Chertsey Road Middlesex Sunbury-on-Thames TW16 7LN Sunbury-on-Thames TW16 7LN (GB)