초록 ▼

Polyolefin substituted carboxylic acylating agents having reduced chlorine content of less than 2,000 ppm and a degree of succination of 1.1-2 have been made from polyisobutylene, chlorine and maleic anhydride. The acylating agents are further reacted with amines and/or alcohols to form dispersants

Polyolefin substituted carboxylic acylating agents having reduced chlorine content of less than 2,000 ppm and a degree of succination of 1.1-2 have been made from polyisobutylene, chlorine and maleic anhydride. The acylating agents are further reacted with amines and/or alcohols to form dispersants having reduced chlorine content.

대표청구항 ▼

[ What is claimed is:] [1.] A method for making polyolefin-substituted carboxylic acylating agents having reduce chlorine content, said method comprising the steps of:A. forming and heating at a temperature less than about 150.degree. C. a mixture comprising a conventional polyolefin having M.sub.n

[ What is claimed is:] [1.] A method for making polyolefin-substituted carboxylic acylating agents having reduce chlorine content, said method comprising the steps of:A. forming and heating at a temperature less than about 150.degree. C. a mixture comprising a conventional polyolefin having M.sub.n 300-10,000 and about 90 mole percent, based on the moles of said polyolefin, of tetra- and trisubstituted end groups, and a halogen, said halogen being added to said mixture in a molar amount up to about an amount equal to said moles of end groups;B. adding to said mixture an .alpha.-.beta. unsaturated acid or an .alpha.-.beta. unsaturated anhydride compound sequentially to or simultaneously with addition of said halogen;C. increasing the temperature of said mixture from about 1 70.degree. C. to about 220.degree. C. and holding the mixture at said temperature for a time sufficient to react said polyolefin with said .alpha.-.beta. unsaturated acid or said .alpha.-.beta. unsaturated anhydride compound;D. cooling said mixture to less than about 200.degree. C. and adding thereto about equal molar amounts of said halogen and said .alpha.-.beta. unsaturated acid or said .alpha.-.beta. unsaturated anhydride compound; andE. increasing the temperature of said mixture to a limit of less than about 220.degree. C. and holding at said temperature for a time sufficient to reduce unreacted .alpha.-.beta. unsaturated acid or .alpha.-.beta. unsaturated anhydride compound in said mixture to less than about three percent,wherein said method produces a polyolefin substituted carboxylic acylating agent having a chlorine content of less than about 2,000 parts per million.