| Aluminum complex grease -> Monitor Keywords |
|
|
  Aluminum complex greaseUSPTO Application #: 20060019842Title: Aluminum complex grease Abstract: This invention relates to a thickener component based on an aluminium carboxylate compound and to an aluminium complex grease made therefrom with addition of a base liquid. (end of abstract) Agent: C. James Bushman - Houston, TX, US Inventors: Peter Finmans, Christina Diblitz, Frank Allmuller, Detlef Hoell USPTO Applicaton #: 20060019842 - Class: 508525000 (USPTO) Related Patent Categories: Solid Anti-friction Devices, Materials Therefor, Lubricant Or Separant Compositions For Moving Solid Surfaces, And Miscellaneous Mineral Oil Compositions, Lubricants Or Separants For Moving Solid Surfaces And Miscellaneous Mineral Oil Compositions (e.g., Water Containing, Etc.), Organic -c(=o)o- Compound, Benzene Ring Bonded Directly To The Carbon Of The -c(=o)o- Group (e.g., Aluminum Complex Salts, Etc.) The Patent Description & Claims data below is from USPTO Patent Application 20060019842. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of U.S. patent application Ser. No. 10/221,336 filed on Feb. 03, 2003, for Thickener Component and Aluminum Complex Grease, the disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to a thickener component based on an aluminium carboxylate compound and to an aluminium complex grease made therefrom with addition of a base liquid. [0004] 2. Description of the Prior Art [0005] Aluminium complex greases have been known. They essentially comprise a mineral-oil base liquid and a thickener system containing one or more aluminium carboxylate compounds. The aluminium carboxylate compound is obtained by reacting a fatty acid and/or an aromatic carboxylic acid with an aluminium alcoholate derivative. The industrially used aluminium alcoholates comprise aluminium isopropoxylate and tri-oxy-aluminium-triisopropoxide. In theory, the reaction proceeds as shown hereinbelow: [0006] When using aluminium isopropoxylate, partial hydrolysis is performed with water before, during, or after reaction of the acids with aluminium alcoholate to produce the usually required free -OH group on the aluminium. Aluminium complex greases are distinguished by a high dropping point, good conveyance and water resistance, and low separation of oil. SUMMARY OF THE INVENTION [0007] It is an object of this invention to provide more effective aluminium complex greases, in particular more suitable thickener components for manufacturing thickeners for aluminium complex greases. The term `more effective` shall mean that the grease exhibits better lubricating properties than conventional aluminium complex greases. Furthermore, it is desired that the thickener component employed for making said aluminium complex greases be storable and marketable as such, thus enabling the grease manufacturer to produce the thickener-containing grease himself. [0008] According to this invention, the problem has been resolved by providing a thickener component comprising [0009] (A) from 99.99 to 94 weight percent, preferably 99.9 to 97 weight percent of an aluminium compound which can be prepared by reacting a hydrolysable aluminium compound with one or more aliphatic monocarboxylic acid(s) or aliphatic derivatives thereof, optionally in the presence of water and/or a C.sub.1- to C.sub.40-alcohol, thereby forming one or more aluminium compound(s) having at least one aluminium carboxylate bond per aluminium atom and, in addition, one or more aluminium-, hydroxy-, aluminium alcoholate-, and/or aluminium-oxygen-aluminium bond(s) and [0010] (B) from 0.01 to 6 weight percent, preferably 0.1 to 3 weight percent of an ester compound having from 6 to 60 carbon atoms, each referring to the total of components (A) and (B). DESCRIPTION OF THE PREFERRED EMBODIMENTS [0011] The term `hydrolysable aluminium compounds` as used herein refers to aluminium compounds that are capable of forming aluminium-oxygen bonds by the action of protondonating compounds, such as water or organic acids. Preferably, such hydrolysable aluminium compounds are aluminium alcoholate- or aluminium-oxo-alcoholate compounds with the alcoholate group preferably being a C.sub.2- to C.sub.4-alcohol, particularly isopropanolate. The carboxylic acids can be branched or unbranched aliphatic monocarboxylic acids of the type R.sup.1--COOH, wherein R.sup.1 represents a C.sub.10- to C.sub.40-radical, preferably a C.sub.14- to C.sub.24-radical, or a C.sub.16- to C.sub.24-radical. [0012] Carboxylic acid derivatives as used herein are defined as compounds which are capable of forming in combination with said aluminium compounds the aluminium-carboxylate bonds that would likewise be obtained when using the corresponding acids. Examples thereof include the anhydrides, acid chlorides, or amides of the aforesaid carboxylic acids. [0013] Ester compounds as used herein particularly refer to compounds which may be formed by reaction of the alcohols/alcoholates present in the reaction mixture with the carboxylic acids/carboxylate residues. [0014] The thickener component is prepared by reaction, preferably about equimolar reaction, i.e. about 1 mole of monocarboxylic acid per mole of aluminium atoms in the compound, of a hydrolysable aluminium compound with one or more of the abovementioned carboxylic acid(s) or carboxylic acid derivative(s) at a temperature not exceeding 145.degree. C., most preferably 135.degree. C., with a temperature profile most preferably increasing gradually by at least 20.degree. C. during a period of at least 90 minutes being ensured. It is preferred that the hydrolysable aluminium compound be placed in the vessel first. [0015] Moreover, it is preferred that the reaction be carried out in a base liquid and the volatile compound released during the reaction, e.g. alcohol, be withdrawn from the equilibrium. [0016] The term `thickener` as used herein is defined as a compound or mixture of compounds prepared from the thickener component, which thickener can be produced by reacting the thickener component with aromatic or cyclic monocarboxylic acids of the type R.sup.2--COOH, wherein R.sup.2 represents a C.sub.6- to C.sub.16-radical, or with the derivatives thereof. Said (aromatic or cyclic) carboxylic acid derivatives are defined as described hereinabove. [0017] The resultant aluminium compound preferably has more than 40 mole % of aliphatic monocarboxylic acid radicals, referring to the amount of carboxylate groups (100 mole %=all the carboxylate groups). The remainder is comprised of aromatic or cyclic monocarboxylic acid radicals. As used herein, the term `aromatic monocarboxylic acid` is defined as a carboxylic acid which has at least one benzene ring or condensed benzene ring and, in addition, may comprise aliphatic hydrocarbon radicals as well. Hence, compounds such as C.sub.6H.sub.5--CH.sub.2--CH.sub.2--. COOH or CH.sub.3--CH.sub.2--C.sub.6H.sub.4--COOH are explicitly included herein. [0018] The thickener as a constituent of the aluminium complex grease is produced by compounding the thickener component, optionally taken up in additional base liquid, with the aromatic or cyclic monocarboxylic acid. [0019] The production process of the invention `yields a raw material (thickener component) with a low ester content for making the real thickener that keeps its low ester content even upon storage. [0020] Besides the thickeners of the invention the aluminium complex greases of the invention also comprise a base liquid which is a hydrocarbon compound and/or a synthetic oil added to the overall composition in quantities of from 30 to 98 weight percent, preferably 60 to 95 weight percent. [0021] The hydrocarbon compound can be a paraffin-base or naphthenic mineral oil, a polyalphaolefin, or a white oil. Further synthetic oils which are suitable as base liquid include fatty acid esters based on mono- or multifunctional fatty acids having a chain length of from 8 to 24 carbon atoms and mono- or polyhydric alcohols. Additional constituents of the aluminium complex greases of the invention may be typical additives. Table 1 presents examples of suitable additives. [0022] The thickener components of the invention are useful as raw materials for producing thickeners included in aluminium complex greases exhibiting improved lubricating properties. They are preferably employed in high-temperature applications for which high dropping points are especially desirable, in central lubricators, and/or for lubricating machinery used for example for producing or processing foodstuffs. Continue reading... Full patent description for Aluminum complex grease Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Aluminum complex grease patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Aluminum complex grease or other areas of interest. ### Previous Patent Application: Oil additive Next Patent Application: Pao oil selection to control lubricating grease evaporation and low temperature Industry Class: Solid anti-friction devices, materials therefor, lubricant or separant compositions for moving solid surfaces, and miscellaneous mineral oil compositions ### FreshPatents.com Support Thank you for viewing the Aluminum complex grease patent info. IP-related news and info Results in 2.58118 seconds Other interesting Feshpatents.com categories: Medical: Surgery , Surgery(2) , Surgery(3) , Drug , Drug(2) , Prosthesis , Dentistry |
||
