Patent ID: 6613723
Filing Date: 2003-09-02
Classification: C08K,C09D,C10M,C10N

Abstract:
A process for preparing an overbased barium complex comprising the steps of:heating a mixture of barium hydroxide monohydrate and an isomeric mixture of from about C10 to about C15 alcohols in the presence of a solvent, thereby producing a first mixture; contacting said first mixture and an isomeric mixture of from about C8 to about C10 branched carboxylic acids, thereby producing a second mixture which comprises unreacted barium hydroxide; and contacting said second mixture and carbon dioxide, thereby producing said overbased barium complex; with the proviso that when the barium concentration in said overbased barium complex is 25 wt. % or more, said isomeric mixture of C8 to about C10 branched carboxylic acids is substantially free of 2-ethylhexanoic acid.