Mineral-oil-free lubricant and method for producing a mineral-oil-free lubricant

US11920103B2 · kind B2 · utility

Assignee

• KAJO GMBH · DE

Inventors

• Frank Bongardt · Meerbusch, DE
• Markus John · Anröchte, DE

Key dates

• Filing date: Dec 19, 2019
• Grant date: Mar 5, 2024
• Expiry date: Dec 19, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2070/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method for producing a lubricant in producing an overbased calcium sulfonate, which is converted from the vaterite form into the calcite form and, finally, a calcium sulfonate grease is produced by heating the mixture. A lubricant may comprise at least one ester composition, calcium carbonate and at least one overbased alkylbenzene sulfonate. The basicity of the mixture is limited during the preparation of the overbased calcium sulfonate to a TBN of at most 550 mg KOH/g and during the conversion of the calcium sulfonate to a TBN of at most 450 mg KOH/g. Both the calcium sulfonate and the grease containing said calcium sulfonate may be produced exclusively on an ester basis, so that the end product does not contain any mineral oil and is therefore easily and completely biodegradable.