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US 5,370,807 AGranted
Boron-containing additive for lubricating oils, and process for preparing said additive
AssigneeMinistero dell'Universita' e della Ricerca Scientifica e Technologica
InventorsPaola Gambini, Paolo Koch
Life of this patent
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Abstract
Viscosity index improver and friction modifier additive constituted by a on-containing poly-(alkyl)-acrylate, process for preparing said additive and use of said additive in the formulation of lubricating oils.
Claims9
A polymeric additive simultaneously displaying properties of viscosity index improver and friction modifier, having a general formula (I):
- ##STR5## wherein said general formula (I) shows the type and amount of monomers, but not their arrangement in the end polymeric chain,
- wherein
- x and y have the meaning of relative amount, x is from 80 to 98% by weight and y is from 2 to 20% by weight;
- R' and R" are the same or different, and are hydrogen or (C.sub.1 -C.sub.3)-alkyl radicals;
- A is either --CH.sub.2 CH.sub.2 -- or --CH(CH.sub.3)CH.sub.2 --;
- R.sub.a is a linear or branched alkyl radical or a mixture of linear or branched alkyl radicals of from 8 to 30 carbon atoms;
- R.sub.b is a radical having the general formula (II):
- ##STR6## wherein R is a difunctional alkylene radical with general formula (III) ##STR7## wherein n is either 0 or 1;
- and
- R.sup.1 -R.sup.6 are the same or different, and are hydrogen or (C.sub.1 -C.sub.3)-alkyl radicals, and
- wherein at least two of the four radicals R.sup.1, R.sup.3, R.sup.4 and R.sup.6 are (C.sub.1 -C.sub.3)-alkyl radicals.
8 more elements
A concentrate for lubricating oils, comprising:
- (a) a dilutent;
- and
- (b) 25-95% by weight of an additive with a general formula (I) ##STR8## wherein said general formula (I) shows the type and amount of monomers, but not their arrangement in the end polymeric chain,
- wherein
- x and y have the meaning of relative amount, x is from 80 to 98% by weight and y is from 2 to 20% by weight;
- R' and R" are the same or different, and are hydrogen or (C.sub.1 -C.sub.3)-alkyl radicals;
- A is either --CH.sub.2 CH.sub.2 -- or --CH(CH.sub.3)CH.sub.2 --;
- R.sub.a is a linear or branched alkyl radical or a mixture of linear or branched alkyl radicals of from 8 to 30 carbon atoms;
- R.sub.b is a radical having the general formula (II):
- ##STR9## wherein R is a difunctional alkylene radical with general formula (III) ##STR10## wherein n is either 0 or 1;
- and
- R.sup.1 -R.sup.6 are the same or different, and are hydrogen or (C.sub.1 -C.sub.3)-alkyl radicals, and
- wherein at least two of the four radicals R.sup.1, R.sup.3, R.sup.4 and R.sup.6 are (C.sub.1 -C.sub.3)-alkyl radicals.
10 more elements
A lubricating oil comprising:
- (a) lubricating oil;
- and
- (b) an effective amount for improving the viscosity index and modifying the friction of an additive with a general formula (I) ##STR11## wherein said general formula (I) shows the type and amount of monomers, but not their arrangement in the end polymeric chain,
- wherein
- x and y have the meaning of relative amount, x is from 80 to 98% by weight and y is from 2 to 20% by weight;
- R' and R" are the same or different, and are hydrogen or (C.sub.1 -C.sub.3)-alkyl radicals;
- A is either --CH.sub.2 CH.sub.2 -- or --CH(CH.sub.3)CH.sub.2 --;
- R.sub.a is a linear or branched alkyl radical or a mixture of linear or branched alkyl radicals of from 8 to 30 carbon atoms;
- R.sub.b is a radical having the general formula (II):
- ##STR12## wherein R is a difunctional alkylene radical with general formula (III) ##STR13## wherein n is either 0 or 1;
- and
- R.sup.1 -R.sup.6 are the same or different, and are hydrogen or (C.sub.1 -C.sub.3)-alkyl radicals, and
- wherein at least two of the four radicals R.sup.1, R.sup.3, R.sup.4 and R.sup.6 are (C.sub.1 -C.sub.3)-alkyl radicals.
10 more elements
Dependencies are inferred from the claim text.