Multifunctional viscosity index improver and dispersant
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United States of America Patent
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Dec 5, 2006
Grant Date -
Sep 23, 2004
app pub date -
Sep 14, 2001
filing date -
Sep 14, 2001
priority date (Note) -
Expired
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Abstract
A process is disclosed that comprises solution grafting a hydrocarbon polymer prepared from at least C.sub.2 to C.sub.28 polymerizable hydrocarbon, said polymer having a number average molecular weight in the range of from about 5,000 to about 500,000, with an ethylenically unsaturated C.sub.3 to C.sub.10 carboxylic acid material, using a free radical initiator, in the presence of an aromatic ester oil of the formula (I) wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are independently selected from the group consisting of hydrogen, --COOR.sub.7, --COOR.sub.8, --COOR.sub.9, --COOR.sub.10, --COOR.sub.11, and --COOR.sub.12, provided that no more than 5 of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are hydrogen, and R.sub.7, R.sub.8, R.sub.9, R.sub.10, R.sub.11, and R.sub.12 are independently selected from the group consisting of alkyl and alkylesters ##STR00001##
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