	US 11,674,103 B2
	Lubricant base stock
Kevin John Duncan, Goole (GB); and Paul Bonner, Goole (GB)
Assigned to EQUUS UK TOPCO LTD, Goole (GB)
Appl. No. 17/419,531
Filed by Croda International Plc, Goole (GB)
PCT Filed Jan. 22, 2020, PCT No. PCT/EP2020/051470 § 371(c)(1), (2) Date Jun. 29, 2021, PCT Pub. No. WO2020/152202, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 1901031 (GB), filed on Jan. 25, 2019.
Prior Publication US 2022/0081636 A1, Mar. 17, 2022
Int. Cl. C10M 107/34 (2006.01); C10N 30/00 (2006.01); C10N 20/00 (2006.01); C10N 20/02 (2006.01); C10N 20/04 (2006.01); C10N 30/02 (2006.01); C10N 30/06 (2006.01); C10N 30/10 (2006.01); C10N 30/12 (2006.01); C10N 40/04 (2006.01); C10N 40/08 (2006.01)

CPC C10M 107/34 (2013.01) [C10M 2209/1045 (2013.01); C10M 2209/1055 (2013.01); C10N 2020/017 (2020.05); C10N 2020/02 (2013.01); C10N 2020/04 (2013.01); C10N 2020/081 (2020.05); C10N 2030/02 (2013.01); C10N 2030/06 (2013.01); C10N 2030/10 (2013.01); C10N 2030/12 (2013.01); C10N 2030/40 (2020.05); C10N 2030/64 (2020.05); C10N 2040/04 (2013.01); C10N 2040/08 (2013.01)]

14 Claims

1. A lubricant base stock comprising:

a) at least 10 wt % of a first polyalkylene glycol block co-polymer having an (EO)(PO)(EO) block structure and having a kinematic viscosity at 40° C. of at most 150 mm²/s (cSt); and

b) at least 10 wt % of a second polyalkylene glycol block co-polymer having an (EO)(PO)(EO) block structure and having a kinematic viscosity at 40° C. different to that of the first polyalkylene glycol block co-polymer;

wherein the total wt % of polyalkylene glycol block co-polymers in the lubricant base stock is at least 87 wt %;

wherein the lubricant base stock comprises less than 8 wt % water;

wherein the lubricant base stock has a kinematic viscosity at 40° C. from 70 mm²/s (cSt) to 250 mm²/s; and

wherein the lubricant base stock is insoluble when added at 1 wt % to seawater at a temperature of at least 40° C.