Abstract:
The present invention relates to a novel polymer with pendant groups. The invention further provides for a lubricating composition containing said polymer. The invention further provides a method and use of controling viscosity index by supplying to an oil of lubricating viscosity the polymer with pendant groups.
Abstract:
The invention provides a composition comprising: (a) a star polymer comprising: (i) a core portion comprising a polyvalent (meth) acrylic monomer, oligomer or polymer thereof or a polyvalent divinyl non-acrylic monomer, oligomer or polymer thereof; and (ii) at leat two arms of polymerized alkyl (meth)acrylate ester; and (b) an oil of lubricating viscosity, wherein the core portion further comprises a functional group of formula (I): -CH 2 -C(R 1 )(C(=O)A)-Y- wherein R 1 is hydrogen, a linear or branched alkyl group containing 1 to 5 carbon atoms; A is nitrogen or oxygen; and Y is a free radical leaving group selected from the gruop consisting of one or more atoms or groups of atoms which may be transferred by a radical mechanism under the polymerisation conditions, a halogen, an -O-N= equals; group and an -S-C(=S)- group. The invention further provides the use of the composition in an oil of lubricating viscosity as a dispersant, a viscosity modifier or a precursor to a dispersant viscosity modifier.
Abstract:
The invention provides a lubricating composition containing (a) 0.1 to 15 wt % of a polymer with (i) a weight average molecular weight of 100, 000 to 500,000; and (ii) a shear stability index of 10 to 60; (b) a phosphorus-containing acid, salt, or ester; (c) a dispersant; and (d) an oil of lubricating viscosity. The invention further provides a method for lubricating a mechanical device with the lubricating composition, comprising the polymer having radial or star architecture
Abstract:
The invention provides a lubricating composition containing (a) 0.001 to 15 wt % of a polymer with (i) a weight average molecular weight of 50,000 to 1,000,000; and (ii) a shear stability index of 10 to 100; (b) an antiwear agent; (c) a corrosion inhibitor; and (d) an oil of lubricating viscosity. The invention further provides a method for lubricating a mechanical device with the lubricating composition.
Abstract:
A lubricating composition, method of making, and method of use are disclosed. The lubricant includes an esterified copolymer including a backbone that includes units derived from a vinyl aliphatic monomer and units derived from a carboxylic acid monomer, the carboxylic acid monomer comprising an alpha,beta-ethylenically unsaturated dicarboxylic acid or derivative thereof. The lubricating composition also includes an oil of lubricating viscosity. The lubricating composition includes no more than 2.5 wt. % of dispersant for dispersing oxidation products, other than the esterified copolymer.
Abstract:
The invention provides a lubricating composition comprising an oil of lubricating viscosity and an esterified polymer. The invention further provides for the use of the esterified polymer as a viscosity modifier or dispersant viscosity modifier. The invention further provides a method for lubricating a mechanical device using the lubricating composition. The esterified polymer has at least 60mol% of ester groups having an even number of carbon atoms, i.e. 8,10,12,14,16,18 or 20 carbon atoms.
Abstract:
The present invention provides a lubricating composition comprising: (a) an oil of lubricating viscosity; and (b) a crosslinked polymer derived from monomers comprising: (i) 0.001 wt % to 7 wt % of a di- or higher functional crosslinking monomer; (ii) 30 wt % or higher of a hydrocarbyl-substituted (meth)acrylic monomer, wherein each hydrocarbyl contains greater than 8 carbon atoms; and (iii) 0 wt % to 40 wt % of a hydrocarbyl-substituted (meth)acrylic monomer, wherein each hydrocarbyl contains 8 or fewer carbon atoms. The invention further provides a method of preparing the crosslinked polymer and its use in a lubricating composition for lubricating an internal combustion engine.
Abstract:
The invention provides a lubricating composition containing an oil of lubricating viscosity and polymer with pendant groups. The invention further provides for a method of controlling viscosity index by supplying to an oil of lubricating viscosity the polymer with pendant groups.
Abstract:
Un proceso para la preparación de una composición lubricante, que comprende la preparación de un polímero mediante un proceso que comprende las etapas (1), (2), opcionalmente (3) y (4): (1) poner en contacto: (i) un iniciador de radicales libres, (ii) un agente de transferencia de cadena que contiene un grupo tio tiocarbonilo y un grupo saliente de radicales libres; y (iii) un monómero polimerizable por radicales, para formar una cadena de polímero; en el que el proceso de la etapa (1) es un proceso de polimerización de radicales con características vivas y al menos 50 % de las cadenas de polímero de la etapa (1) contienen un grupo terminal reactivo capaz de reaccionar con un agente de acoplamiento polivalente; y (2) poner en contacto el polímero preparado mediante la etapa (1) con un agente de acoplamiento polivalente para formar un polímero en estrella, en el que el polímero en estrella es un polímero en estrella con brazos constituidos por bloques, en el que el polímero en estrella con brazos constituidos por bloques contiene un brazo del polímero derivado de dos o más monómeros en el que los monómeros están en el mismo brazo y en el que el polímero en estrella se deriva de al menos dos monómeros que comprenden: (a) al menos 50 % en peso de un monómero de (met)acrilato sustituido con alquilo C12 a C15 y (b) menos de 50 % en peso de un monómero de (met)acrilato de alquilo que contiene 1 a 30 átomos de carbono distinto del monómero de (met)acrilato de alquilo C12 a C15; y (c) que contiene opcionalmente menos de 20 % en peso de estireno; y (d) que contiene opcionalmente menos de 10 % en peso de metacrilamida de alquilo; (3) opcionalmente poner en contacto el polímero preparado mediante la etapa (1) o la etapa (2) con un inhibidor de la polimerización; y (4) mezclar el polímero preparado mediante la etapa (2) o la etapa (3) con un aceite de viscosidad lubricante para formar una composición lubricante.
Abstract:
A lubricating composition contains an oil of lubricating viscosity and 0.5 to 10 percent by weight of a poly (meth)acrylate viscosity modifier polymer comprising (i) 15 weight percent to 35 weight percent monomer units of methyl (meth) acrylate, (ii) 0 to 10 weight percent monomer units of one or more C2-C6 alkyl (meth) acrylates, (iii) 50 to 85 weight percent monomer units of one or more C8-C30 alkyl (meth) acrylates, and (iv) 0 to 10 weight percent monomer units of one or more nitrogen-containing monomers. Such a lubricating composition exhibits a high viscosity index and may impart improved fuel economy to an internal combustion engine.