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:
Dec. 10, 2013
Filed:
Nov. 07, 2005
Andrew S Oldfield, Reading, GB;
Andrew S Oldfield, Reading, GB;
Croda International PLC, Goole, North Humberside, GB;
Abstract
An automotive lubricant composition comprising a base fluid and an ashless polymeric dispersant is claimed. The ashless polymeric dispersant has a number average molecular weight of between 500 and 10,000 and comprises a polar tall group which itself comprises a polymeric backbone of 2 to 30 monomeric repeat units, each repeat unit comprising a hydrocarbon chain functionalised by the presence of at least one electronegative element or moiety, the tail group being linked to a polar head group which comprises a polar moiety selected from at least one of acid, ester, amide or alcohol moieties. The dispersant has good dispersancy properties, when used as a sole dispersant or in combination with other dispersants. It provides enhanced seal resistance and has good oxidative stability in automotive applications as compared to current commercial products. Furthermore the low temperature viscosity of the automotive lubricant composition with the designed dispersant is superior to that of a composition with current commercial dispersants and the designed dispersant does not react with ZDDP and reduce the antiwear capabilities of ZDDP.