The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2001
Filed:
Jul. 21, 1999
Theo I. Eliades, Scarborough, CA;
Ronald J. Muir, West Hill, CA;
Leonard A. Matthews, Gretna, LA (US);
Crompton Corporation, Greenwich, CT (US);
Abstract
Viscosity increase or drift control occurs in overbased detergents in storage over time and particularly at elevated temperatures. Viscosity drift is now controlled by the addition of additive amounts of a compound having an oleophilic group and further having secondary hydroxyl functionality to a detergent in storage prior to incorporation in a finished oil. Additions of this control agent in additive amounts of about 0.1 to 5.0%, and preferably 0.25 to 1.0%, by weight effected minimal viscosity drift of no more than about 10% where the detergent was stored at elevated temperatures of about 37° C. to 82° C. for about 4 weeks. The degree of viscosity drift control is proportional to the amount of control agent added to the overbased detergent. Preferred viscosity drift control agents are alkylated phenols such as dinonyl phenol, vegetable oils such as canola oil and jojoba oil, and hydroxy carboxylic acids such as 12-hydroxy stearic acid. The viscosity drift control agent is particularly effective for the storage of highly overbased calcium sulfonates.