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:
Feb. 10, 1998
Filed:
Mar. 27, 1995
BP International Limited, London, GB;
Abstract
Process for producing an additive concentrate having a viscosity of less than 1000 cSt at 100 EC, by reacting at elevated temperature and in the presence of an inorganic halide or calcium acetate catalyst (A) either (i) a hydrocarbyl phenol or (ii) a hydrocarbyl phenol and sulphur, (B) an alkaline earth metal base added in either a single addition or in a plurality of additions during the reaction, (C) either a polyhydric alcohol having from 2 to 4 carbon atoms, a di- or tri- C.sub.2 to C.sub.4 glycol, an alkylene glycol alkyl ether or a polyalkylene glycol alkyl ether, (D) a lubricating oil, (E) carbon dioxide added subsequent to the, or each, addition of compound (B), and (F) sufficient to provide from 12 to less than 40% by weight based on the weight of the concentrate of either (i) a carboxylic acid having the formula RCH(R')COOH, wherein R is a C.sub.10 to C.sub.24 alkyl or alkenyl group and R is either hydrogen, a C.sub.1 to C.sub.4 alkyl group or a --CH.sub.2 --COOH group, or an anhydride, acid chloride or ester thereof or (ii) a di- or polycarboxylic acid containing from 36 to 100 carbon atoms or an anhydride, acid chloride or ester thereof, the weight ratios of components (A) to (F) being such as to produce a concentrate having a TBN greater than 350.