US 12,467,011 B2
Lubricant composition and use thereof
Stefan Seemeyer, Wolfratshausen (DE); Patrick Wittmeyer, Gerertsried (DE); Maximilian Erhard, Poecking (DE); Maria Frackowiak, Nuremberg (DE); and Balasubramaniam Vengudusamy, Munich (DE)
Assigned to KLUEBER LUBRICATION MUENCHEN GMBH & CO. KG, Munich (DE)
Appl. No. 17/920,047
Filed by Klueber Lubrication Muenchen SE & CO. KG, Munich (DE)
PCT Filed Apr. 21, 2021, PCT No. PCT/EP2021/060353
§ 371(c)(1), (2) Date Oct. 20, 2022,
PCT Pub. No. WO2021/219456, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 10 2020 111 403.6 (DE), filed on Apr. 27, 2020.
Prior Publication US 2023/0174885 A1, Jun. 8, 2023
Int. Cl. C10M 169/04 (2006.01); C10M 105/38 (2006.01); C10M 107/34 (2006.01); C10M 111/04 (2006.01); C10M 129/76 (2006.01); C10M 133/12 (2006.01); C10M 133/44 (2006.01); C10M 135/10 (2006.01); C10M 135/18 (2006.01); C10M 137/04 (2006.01); C10M 141/10 (2006.01); C10N 20/04 (2006.01); C10N 30/10 (2006.01); C10N 30/12 (2006.01); C10N 40/00 (2006.01); C10N 40/02 (2006.01); C10N 40/04 (2006.01); C10N 40/06 (2006.01); C10N 40/08 (2006.01); C10N 40/32 (2006.01)
CPC C10M 169/04 (2013.01) [C10M 105/38 (2013.01); C10M 107/34 (2013.01); C10M 111/04 (2013.01); C10M 129/76 (2013.01); C10M 133/12 (2013.01); C10M 133/44 (2013.01); C10M 135/10 (2013.01); C10M 135/18 (2013.01); C10M 137/04 (2013.01); C10M 141/10 (2013.01); C10M 2207/2835 (2013.01); C10M 2207/284 (2013.01); C10M 2209/1075 (2013.01); C10M 2215/26 (2013.01); C10M 2215/30 (2013.01); C10M 2219/044 (2013.01); C10M 2219/066 (2013.01); C10M 2223/04 (2013.01); C10N 2020/04 (2013.01); C10N 2030/10 (2013.01); C10N 2030/12 (2013.01); C10N 2040/02 (2013.01); C10N 2040/04 (2013.01); C10N 2040/06 (2013.01); C10N 2040/08 (2013.01); C10N 2040/32 (2013.01); C10N 2040/38 (2020.05)] 18 Claims
 
1. A lubricant composition comprising
an oil-soluble polyalkylene glycol, as a base oil component;
an ester compound selected from the group of natural esters and synthetic esters, and combinations thereof, as another base oil component; and
an additive mixture comprising an antioxidant and an anticorrosive,
wherein the anticorrosive is selected from neutral alkali metal and alkaline earth metal salts of sulfonic acids and derivatives and combinations thereof, wherein the neutral alkali metal and alkaline earth metal salts are Na, Ca, K and Mg salts,
wherein the anticorrosive has a total acid number (TAN) of 30 mg KOH/g or less,
wherein the oil-soluble polyalkylene glycol has a molecular weight Mn of 500 g/mol or more to 1400 g/mol or less,
wherein the oil-soluble polyalkylene glycol and the ester compound are the only base oil components comprised in the lubricant composition,
wherein the weight ratio of oil-soluble polyalkylene glycol to the ester compound based on the total weight of those two base oil components in the lubricant composition is in the range from 15:85 to 70:30,
wherein the lubricant composition does not comprise an overbased alkali metal or alkaline earth metal salt,
wherein the oil-soluble polyalkylene glycol is a copolymer selected from polybutylene oxide-polypropylene oxide copolymers, polybutylene oxide-polyethylene oxide copolymers and polybutylene oxide-polypropylene oxide-polyethylene oxide copolymers, and combinations thereof,
wherein the amount of oil-soluble polyalkylene glycol is 5-70% by weight,
wherein the amount of the antioxidant is in the range of 0.05-3.5% by weight, and
wherein the amount of the anticorrosive is in the range of 0.05-3.5% by weight.