Patent ID: 11959042
Assignee: HYUNDAI MOTOR COMPANY
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 4:
5. A method for preparing a lubricant composition, the method comprising steps of:
preparing an admixture comprising polyalkylene glycol (PAG) and a glycol ether compound;
heat-treating the admixture in the presence of a catalyst; and
injecting an antioxidant into a heat-treated resulting product,
wherein the lubricant composition comprises: an amount of about 85 to 95% by weight of polyalkylene glycol; an amount of about 4 to 10% by weight of the glycol ether compound; and an amount of about 1 to 5% by weight of the antioxidant, based on the total weight of the lubricant composition.