EP0146162A2
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EP
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Preparation of ethylene copolymer viscosity index improver - dispersant additive useful in oil compositions
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1982-05-06
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Granted: —
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Expires: 2002-05-06
Abstract
Abstract Oil-soluble viscosity index-improving ethylene copolymers, such as copolymers of ethylene and propylene; and ethylene, propylene and diolefin; etc., are maleic anhydride, and the maleic anhydride is maintained below its solubility limit during grafting. The grafted product may be reacted with polyamines having two or more primary amine groups and a carboxylic acid component, preferably alkylene polyamine and alkenyl succinic anhydride, such as polyisobutenyl succinic anhydride; or the grafted ethylene copolymer can be reacted with already formed salts, amides, imides, etc. of said polyamine and acid component, preferably imides of alkylene polyamine and alkenyl succinic anhydride. The grafting reaction gives products with improved haze performance.
Inventors
- 👤 Ricardo Alfredo Bloch
- 👤 Thomas James Mccrary, Jr.
- 👤 Darrel William Brownawell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 09:03
CPC Classifications
C; C10; C10M; C10M143/00; C10M143/02; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C10M2203/00; C10M2203/10; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/027; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/24; C10M2215/26; C10M2217/00; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/044; C10M2221/00; C10M2221/04; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10M2227/00; C10M2227/06; C10N; C10N2010/00; C10N2010/04; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A process which comprises grafting; an oil soluble ethylene copolymer having a number average molecular weight in the range of from 5,000 to 500,000 and comprising from 15 to 90 wt. % ethylene and from 10 to 85 wt. % C 3 to C28 olefin, in a lubricating mineral oil solution with maleic anhydride using a free radical initiator at elevated temperatures, wherein a portion of said oil also becomes grafted with maleic anhydride and wherein the amount of maleic anhydride that is to be grafted exceeds its solubility in said oil, characterized in that the maleic anhydride is maintained below its solubility limit in said oil during the grafting reaction by either periodic addition or continuous addition of maleic anhydride.
Claim 2
Dependent Claim
121 words
A process which comprises grafting; an oil soluble ethylene copolymer having a number average molecular weight in the range of from 5,000 to 500,000 and comprising from 15 to 90 wt. % ethylene and from 10 to 85 wt. % C 3 to C28 olefin, in a lubricating mineral oil solution with maleic anhydride using a free radical initiator at elevated temperatures, wherein a portion of said oil also becomes grafted with maleic anhydride and wherein the amount of maleic anhydride that is to be grafted exceeds its solubility in said oil, characterized in that the maleic anhydride is maintained below its solubility limit in said oil during the grafting reaction by either periodic addition or continuous addition of maleic anhydride.
Claim 3
Dependent Claim
46 words
2 . A process according to claim 1, wherein proportional amounts of said free radical initiator are added together with, or alternating with, said maleic anhydride, and wherein said free radical initiator is added to the reaction mixture either periodically or continually with said maleic anhydride.
Claim 4
Dependent Claim
118 words
A process according to claim 1, wherein the concentration of unreacted maleic anhydride is maintained below 1 wt. % maleic anhydride based on the weight of said copolymer and oil, during said grafting, and which further comprises the reaction of said grafted polymer in oil with an alkylene or oxyalkylene polyamine having at least two primary amine groups and a carboxylic acid selected from the group consisting of substituted succinic anhydride or acid having 12 to 49 carbon atoms in said hydrocarbyl group, long chain monocarboxylic acid of the formula RCOOH where R is a hydrocarbyl group of 50 to 400 carbon atoms and long chain hydrocarbyl substituted succinic anhydride or acid having 50 to 400 carbon atoms.
Claim 5
Dependent Claim
106 words
A process according to claim 3 , wherein the concentration of unreacted maleic anhydride is maintained below 0.4 wt. % maleic anhydride, based on the weight of said copolymer and oil, during said grafting, said ethylene copolymer has a number average molecular weight of from 10,000 to 200,000 and comprises. from 30 to 80 wt. % ethylene and from 20 to 70 wt. % propylene; said polyamine is a polyalkylene amine of the general formula: wherein x is from 1 to 10, and the alkylene radical contains from 2 to 7 carbon atoms; and wherein said carboxylic acid is an alkenyl succinic anhydride or acid thereof.
Claim 6
Dependent Claim
57 words
A process according to claim 4, wherein said polyamine is diethylene triamine and said alkenyl succinic anhydride is polyisobutenyl succinic anhydride, in a relative molar ratio of from 1.5 to 3.0 mole of said succinic anhydride and from 1.0 to 2.0 mole of said diethylene triamine per molar moiety of maleic anhydride grafted on said ethylene-propylene copolymer.
Claim 7
Dependent Claim
40 words
A process according to claim 3", wherein unreacted maleic anhydride is maintained during the course of the grafting reaction at a concentration below about 0.4 wt. % of maleic anhydride, based upon the total weight of the copolymer-oil solution present.
Claim 8
Dependent Claim
80 words
A process according to claim 6, wherein said grafting reaction is carried out under nitrogen for 0.1 to 12 hours at temperatures of 150° to 220°C with di-tertiary butyl peroxide and wherein said subsequent reaction with said amine and long chain acid is carried out in said mineral oil solvent at a temperature of 150° to 230°C for a period of time of 1.0 to 10 hours; such that no substantial increase in viscosity occurs upon storage of said product.
Claim 9
Dependent Claim
21 words
A process according to claim 7, wherein the nitrogen content of the reaction product is from 0.1 to 1.0 wt. %.
References Cited (Backward Citations)
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