Claims
- 1. A process for preparing a substantially haze-free mineral hydrocarbon oil solution concentrate composition which comprises a mineral oil of lubricating viscosity and from about 0.1 to 50 wt. % based upon the total weight of said composition of a dispersant-viscosity index improver material having haze forming tendencies, said dispersant-viscosity index improver having been formed by grafting a copolymer consisting of ethylene and propylene in the presence of a free radical iniator with (a) a vinyl containing nitrogen monomer selected from the group consisting of vinyl pyridine, lower alkyl (C.sub.1 -C.sub.18) substituted C-vinyl pyridine and N-vinyl pyrrolidine or, (b) a monomer system comprising maleic anhydride and monomers copolymerizable therewith being alpha-beta mono-ethylenically unsaturated monomers containing up to 10 carbon atoms and post reacting the graft with a polyamine or, (c) maleic anhydride, which graft is subsequently reacted with a polyamine, polyol, or hydroxy amine, said process consisting essentially of treating the concentrate composition with about 0.5 to 25% by wt., based upon the weight of said composition of an oil-soluble alkyl hydroxy benzene compound, said compound containing 1-3 alkyl groups, each containing about 8-12 carbon atoms and said compound having 1-3 hydroxy groups, at a temperature of about 50.degree. C. to 150.degree. C.
- 2. The process according to claim 1 wherein said dispersant-viscosity index improver was formed by grafting an ethylene-propylene copolymer with 2-vinyl pyridine.
- 3. The process according to claim 2 wherein said dispersant-viscosity index improver was formed by grafting an ethylene-propylene copolymer with .beta.-vinyl pyridine.
- 4. The process according to claim 1 wherein the alkyl hydroxy benzene compound comprises a mono alkylated phenol, wherein said alkyl group contains from 8 to 12 carbon atoms.
- 5. The process according to claim 1 wherein the alkyl hydroxy benzene compound is selected from the group consisting of nonyl phenol and dodecyl phenol.
- 6. The process according to claim 1 wherein said dispersant-viscosity index was formed by solution grafting said ethylene-propylene copolymer in a hydrocarbon mineral lubricating oil.
- 7. The process of claim 1 wherein the dispersant-viscosity index improver material was formed by solution grafting an ethylene-propylene copolymer containing from about 38 to 70 wt. % ethylene with maleic anhydride in a mineral lubricating oil solvent and subsequently reacting said grafted copolymer with at least one polyamine.
- 8. The process of claim 7 wherein said polyamine comprises an alkylene polyamine
- 9. A process for preparing a substantially haze-free mineral hydrocarbon oil solution concentrate composition which comprises a mineral oil of lubricating viscosity and from about 0.1 to 50 wt. % based upon the total weight of said composition of a dispersant-viscosity index improver material having haze forming tendencies, said dispersant-viscosity index improver having been formed by grafting a copolymer consisting of ethylene and propylene in the presence of a free radical iniator with (a) a vinyl containing nitrogen monomer selected from the group consisting of vinyl pyridine, lower alkyl (C.sub.1 -C.sub.18) substituted C-vinyl pyridine and N-vinyl pyrrolidone or, (b) a monomer system comprising maleic anhydride and monomers copolymerizable therewith being alph-beta mono-ethylenically unsaturated monomers containing up to 10 carbon atoms and post reacting the graft with a polyamine or, (c) maleic anhydride, which graft is subsequently reacted with a polyamine, polyol, or hydroxy amine, said grafted copolymer having a viscosity average molecular weight of about 10,000-200,000, said process consisting essentially of treating the concentrate composition with about 2.0 to 25% by wt., based upon the weight of said composition of an oil-soluble mono alkylated C.sub.8 -C.sub.12 alkyl phenol, at a temperature of about 50.degree. C. to 150.degree. C.
- 10. The process according to claim 9 wherein said dispersant-viscosity index improver was formed by grafting an ethylene-propylene copolymer with said vinyl containing nitrogen monomer.
- 11. The process according the claim 9 wherein the mono alkylated C.sub.8 -C.sub.12 alkyl phenol is selected from the group consisting of nonyl phenol and dodecyl phenol.
- 12. The process according to claim 26 wherein said dispersant-viscosity index improver was formed by grafting said ethylene-propylene copolymer in a hydrocarbon mineral lubricating oil.
Parent Case Info
This is a continuation of application Ser. No. 709,680 filed 3/8/85 now abandoned which is a Rule 60 continuation of application Ser. No. 278,179 filed June 29, 1981 now abandoned.
US Referenced Citations (11)
Continuations (2)
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Number |
Date |
Country |
Parent |
709680 |
Mar 1985 |
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Parent |
278179 |
Jun 1981 |
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