OVERBASED ADDITIVES

1,200,922. Overbased additives. ESSO RESEARCH & ENG. CO. 14 June, 1968 [12 July, 1967], No. 32123/67. Heading C2C. [Also in Division C5] A basically reacting complex is prepared by a process which comprises reacting an alcoholate (i.e. compounds derived from ether alcohols or alkanols) of a polyvalent metal of Groups I, II, III or VIII of the Mendeleeff Periodic Table with an acidic reactant. The acidic reactant is defined as a hydride or oxide of sulphur, selenium, or tellurium; an oxide or sulphide of phosphorus or arsenic; or an oxide of boron. The acidic reactant is preferably liquid or gaseous, but can be solid, e.g. boron oxide, or phosphorus pentoxide. Probable reactions for trivalent metal alcoholates and hydrides of sulphur, selenium, and tellurium are disclosed.