Diesel fuel and lubricating oil antiforms and methods of use
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United States of America Patent
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Apr 24, 2001
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N/A
app pub date -
Jun 8, 1999
filing date -
Apr 4, 1996
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Abstract
The present invention relates to diesel fuel and lubrication oil defoaming agents, and crude oil demulsifiers, as well as methods for using same. In particular, the defoaming agents and demulsifiers are comprised of copolymers which have structures constituting a backbone of polysiloxane onto which is grafted an organic group. These structures comprise a polymer of the formula MD.sub.x D'.sub.y D'.sub.z M, where M is O.sub.0.5 Si(CH.sub.3).sub.3, D is a OSi(CH.sub.3).sub.2, D' is OSi(CH.sub.3)R, D' is OSi(CH.sub.3)R', R is a polyhydric C.sub.6 -C.sub.28 organic group, R' is a phenol derivative or a long chain aliphatic group or polyethers, z is between 0 and 80, x+y+z is between 10-200, x/z is .gtoreq.1, and x/(y+z) is between about 1 and about 5, or formula M'D.sub.a M' where M' is O.sub.0.5 Si(CH.sub.3).sub.2 R, a is between 4-10, and R and D are the same as defined above.
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