Highly stable polymer dispersions and method for the production thereof
(19)AUSTRALIAN PATENT OFFICE (54) Title Highly stable polymer dispersions and method for the production thereof (51)6 International Patent Classification(s) C10M 157/00 C10M 145/38 C10M 145/14 C10M 161/00 C10M 129/16 C10N 030/02 C10M 145/36 C10M 143/04 C10M 129/74 (21) Application No: 2003258669 (22) Application Date: 2003 .08.27 (87) WIPO No: WO04/037955 (30) Priority Data (31) Number (32) Date 102 49 295.6 2002 .10.22 (33) Country DE 200511177 (43) Publication Date : 2004.05.13 (43) Publication Journal Date : 2004 .06.17 (71) Applicant(s) ROHMAX ADDITIVES GMBH (72) Inventor(s) Tschepat, Wolfgang; Massoth, Stephan;Scherer, Markus(-1-1) Application NoAU2003258669 A8(19)AUSTRALIAN PATENT OFFICE (54) Title Highly stable polymer dispersions and method for the production thereof (51)6 International Patent Classification(s) C10M 157/00 C10M 145/38 C10M 145/14 C10M 161/00 C10M 129/16 C10N 030/02 C10M 145/36 C10M 143/04 C10M 129/74 (21) Application No: 2003258669 (22) Application Date: 2003 .08.27 (87) WIPO No: WO04/037955 (30) Priority Data (31) Number (32) Date 102 49 295.6 2002 .10.22 (33) Country DE 200511177 (43) Publication Date : 2004.05.13 (43) Publication Journal Date : 2004 .06.17 (71) Applicant(s) ROHMAX ADDITIVES GMBH (72) Inventor(s) Tschepat, Wolfgang; Massoth, Stephan;Scherer, Markus-1- The present invention relates to a polymer dispersion having high stability, comprising A) at least one dispersed polyolefin, B) at least one dispersing component, C) mineral oil and D) at least one compound comprising (oligo)oxyalkyl groups. Polymer dispersion comprising
A) at least 20% by weight of dispersed polyolefin, B) at least one dispersing component that represents a copolymer which comprises one or more blocks A and one or more blocks X, the block A representing olefin copolymer sequences, hydrogenated polyisoprene sequences, hydrogenated copolymers of butadiene/isoprene or hydrogenated copolymers of butadiene/isoprene and styrene, and the block X representing polyacrylate-, polymethacrylate-, styrene-, α-methylstyrene-or N-vinyl-heterocyclic sequences and/or sequences of mixtures of polyacrylate-, polymethacrylate-, styrene-, α-methylstyrene-or N-vinyl-heterocycles, C) mineral oil and D) at least one compound comprising (oligo)oxyalkyl groups, which compound comprises at least one ethoxylated alcohol comprising from 2 to 8 ethoxy groups, the hydrophobic radical of the alcohol comprising from 4 to 22 carbon atoms. Polymer dispersion according to Claim 1, characterized in that the component B) is obtainable by graft copolymerization of a monomer composition comprising (meth)acrylates and/or styrene compounds onto polyolefins according to component A). Polymer dispersion according to Claim 2, characterized in that a monomer composition is used, comprising one or more (meth)acrylates of the formula (I)
in which R denotes hydrogen or methyl and R1 denotes hydrogen or a linear or branched alkyl radical having 1 to 40 carbon atoms,
and/or one or more (meth)acrylates of the formula (II)
in which R denotes hydrogen or methyl and R2 denotes an alkyl radical substituted by an OH group and having 2 to 20 carbon atoms or denotes an alkoxylated radical of the formula (III)
in which R3 and R4 independently represent hydrogen or methyl, R5 represents hydrogen or an alkyl radical having 1 to 40 carbon atoms and n represents an integer from 1 to 90,
and/or one or more (meth)acrylates of the formula (IV)
in which R denotes hydrogen or methyl, X denotes oxygen or an amino group of the formula -NH- or -Nr7-, in which R7 represents an alkyl radical having 1 to 40 carbon atoms, and R6 denotes a linear or branched alkyl radical substituted by at least one -NR8R9 group and having 2 to 20, preferably 2 to 6, carbon atoms, R8 and R9, independently of one another, representing hydrogen, an alkyl radical having from 1 to 20, preferably from 1 to 6 or in which R8 and R9, including the nitrogen atom and optionally a further nitrogen or oxygen atom, form a 5- or 6-membered ring which may optionally be substituted by C1-C6-alkyl. Polymer dispersion according to Claim 1, 2, or 3, characterized in that a monomer composition which comprises a heterocyclic vinyl compound is used in the grafting reaction. Polymer dispersion according to any of Claims 1 to 4, characterized in that the weight ratio of the blocks A to the blocks X is in the range from 20:1 to 1:20. Polymer dispersion according to one or more of the preceding claims, characterized in that the component A) comprises one or more olefin copolymers. Polymer dispersion according to one or more of the preceding claims, characterized in that the polymer dispersion comprises from 2 to 40% by weight of component C). Polymer dispersion according to one or more of the preceding claims, characterized in that the weight ratio of component C) to component D) is in the range from 2:1 to 1:25. Polymer dispersion according to one or more of the preceding claims, characterized in that the polymer dispersion comprises from 2 to 40% by weight of the components D). Polymer dispersion according to one or more of the preceding claims, characterized in that the polymer dispersion comprises a compound which has a dielectric constant greater than or equal to 9. Polymer dispersion according to Claim 10, characterized in that the compound having a dielectric constant greater than or equal to 9 is selected from water, ethylene glycol, polyethylene glycol and/or alcohol. Polymer dispersion according to one or more of the preceding claims, characterized in that the polymer dispersion comprises up to 30% by weight of component B). Process for the preparation of polymer dispersions according to any of Claims 1 to 12, characterized in that the component A) is dispersed in a solution of components B) with application of shear forces at a temperature in the range from 80 to 180°C. Use of a polymer dispersion according to any of Claims 1 to 12 as an additive for lubricating oil formulations.