Abstract:
La présente demande concerne l'utilisation d'un polymère peigne comprenant des unités répétitives susceptibles d'être obtenues par polymérisation de monomères (a) de formule (I) dans laquelle : R1 représente un atome d'hydrogène ou un groupement méthyle, X1 représente un groupement choisi parmi : -O-, -O(AO)m, ou -NH-, chaque groupement A représentant, de manière indépendante un groupement alkylène en C2-C4 et m un entier allant de 0 à 10, R2 est un groupement polybutylène, et p est égal à 0 ou 1, pour améliorer les propriétés d'épaississement à froid d'une composition lubrifiante, présentant un grade (X)W-(Y) selon la norme SAEJ 300 dans laquelle x = 0, 5 ou 10 et y = 8, 16, 20, 30 ou 40, comprenant au moins une huile de base, la composition lubrifiante ainsi obtenue présentant un Gelation index selon la norme ASTM D5133 inférieur à 6.
Abstract:
The invention relates to a process for preparing an imidized polymer in a mixing or kneading device, by a reaction of a mixture, comprising a polymer, containing anhydride groups or derivatives thereof and an aromatic polyamine compound, wherein the reaction is carried out in the presence of an acid. With this process an imidized polymer can be obtained with a reduced amount of incomplete reacted anhydride groups with respect to the anhydride groups originally present in the polymer as well as a low amount of free and amid-bound aromatic polyamine. The invention further relates to a solid compound, and in particular a solid multifunctional viscosity modifier comprising a polymer comprising between 0.1 and 10 functional groups per 1000 C-atoms, the functional groups comprising aromatic amine based imide groups, wherein the ratio of imide groups with respect to the functional groups is more than 0.85, preferably more than 0.90 and most preferably more than 0.95 and to a lubricating oil, comprising the multifunctional viscosity modifier according to the invention, wherein the amount of low molecular weight aromatic polyamine in the oil is smaller than 10 ppm.
Abstract:
The invention relates to a method for producing a liquid polymer composition, whereby ethylenically unsaturated monomers are polymerized using initiators, which have a transferable atom group, and using one or more catalysts, which comprise(s) at least one transition metal. This polymerization is carried out in the presence of ligands, which can form a coordination compound with the metallic catalyst(s). In addition, the catalyst is oxidized after polymerization, and the catalyst is then separated out by filtering. The composition has a solvent with a dielectric constant less than or equal to 4.
Abstract:
The present invention provides a method and use of incorporating water-soluble or water-dispersible polymer(s), stabilized in an invert (water-in-oil) emulsion, into an oil continuous metalworking emulsifiable concentrate, which is then diluted with water to form an end use oil-in-water emulsion. According to the present invention, the invert polymer emulsion (A) is added to the metalworking emulsifiable concentrate (B) to embed at least one water-soluble or water-dispersible polymer into the metalworking emulsifiable concentrate, to form a stable, emulsifiable concentrate (C). The stable, emulsifiable concentrate (C) is then diluted with water to form an end use oil-in-water emulsion (D) causing the water-soluble or water-dispersible polymer in the end use emulsion to impart antimist performance.
Abstract:
The invention provides dispersants and dispersant viscosity index improvers which include polymers of conjugated dienes which have been hydrogenated, functionalized, optionally modified and post treated. The dispersant substances include a copolymer of two different conjugated dienes. The polymers are selectively hydrogenated to produce polymers which have highly controlled amounts of unsaturation, permitting highly selective functionalization. The polymers may be functionalized by grafting of heteroatom-containing olefins. Also provided are lubricant fluids, such as mineral and synthetic oils, which have been modified in their dispersancy and/or viscometric properties by means of the dispersant substances of the invention. Also provided are methods of modifying the dispersancy and/or viscometric properties of lubricating fluids such as mineral and synthetic lubricating oils. The dispersant substances may also include a carrier fluid to provide dispersant concentrates.
Abstract:
This invention relates to a copolymer having structural units derived from monomers which are (A) at least one ethylenically unsaturated alcohol, carboxylic acid or ester, with at least one of (B) an ethylenically unsaturated carboxylic ester with a polar group in the ester, and (C) an ethylenically unsatured carboxylic amide. The invention also relates to the use of such a copolymer in hydrocarbon and aqueous fluid media.
Abstract:
A copolymer comprising units of an unsaturated dicarboxylic monomer and an ethylene alpha -olefin macromer is disclosed. The macromer is an unsaturated ethylene alpha -olefin polymer comprising units of from ethylene and at least one alpha -olefin represented by the formula CH2=CHR , wherein R is a C1 to C18 linear alkyl group or a C3 to C18 branched alkyl group; the ethylene alpha -olefin polymer has a number average molecular weight of from about 500 to about 100,000; and at least about 30 % of the unsaturation in the ethylene alpha -olefin polymer is terminal vinylidene. The copolymer has a carbon-carbon backbone and contains succinic groups and hydrocarbyl groups. The copolymer can be derivatized by reaction with nucleophilic reactants including monoamines, polyamines, monoalcohols, polyols, amino alcohols, reactant metal compounds and mixtures thereof. The derivatized copolymers can be post-treated (e.g., borated) with one or more post-treating agents (e.g., boric acid). The copolymer, its derivatives, and post-treated derivatives are useful as additives (e.g., dispersants and viscosity index improvers) in fuels and in lubricating oils.