Oil-soluble anionic-graft polymer of ethylene-propylene copolymer and anionically polymerizable monomer having utility as multifunctional V. I. improver for lubricating oils

Claim 2

An oil soluble anionic-graft polymer having a number average molecular weight in the range of about 1,000 to 500,000 while containing in the range of about 0.005 to 2 wt. % nitrogen and being useful as an oil additive having dispersancy properties, said oil soluble polymer being a graft polymer of: 1. an anionically polymerizable monomer containing in the range of about 3 to 50 carbon atoms and at least one electron withdrawing group in such proximity to an olefinic bond that said bond is activated, said monomer being seleeted from the group consisting of: a. N,N (di C 1-10 hydrocarbyl) carbodiimides; b. monomers of the formula: ##STR5## wherein X is oxygen or an NR" group; n is 2 to 5; R' and R" are hydrogen or a C 1 to C 4 alkyl group; and R'" and R"" are C 1 to C 12 hydrocarbyl groups; and c. nitrile monomers of the formulae: ##STR6## wherein R v is hydrogen or lower alkyl and X is selected from the group consisting of hydrogen, halogen, cyano and lower alkyl; and, (2) an anion of an oxidized ethylene copolymer comprising about 20 to 80 mole % ethylene and about 20 to 80 mole % propylene.

Claim 3

An oil soluble graft polymer according to claim 12, wherein said monomer is said N,N (di C 1-10 hydrocarbyl) carbodiimide.

Claim 4

An oil soluble graft polymer according to claim 2, wherein said monomer is N,N-diisopropylcarbodiimide.

Claim 5

An oil soluble graft polymer according to claim 1, wherein said monomer is said monomer (b).

Claim 6

An oil soluble graft polymer according to claim 4, wherein said monomer is N,N-dimethylaminoethyl methacrylate.

Claim 7

An oil soluble graft polymer according to claim 1, wherein said monomer is said nitrile monomer (c).

Claim 8

An oil soluble graft polymer according to claim 6, wherein said monomer is acrylonitrile.

Claim 9

An oil soluble graft polymer according to claim 1, wherein said molecular weight is in the range of 10,000 to 200,000; and said ethylene copolymer contains up to 20 mole % based on the molar amount of ethylene and propylene units, of olefin selected from the group consisting of olefins of the formula RCH = CH 2 , where R is an aliphatic or cycloaliphatic radical of 2 to 48 carbons and diolefins of 4 to 26 carbon atoms.

Claim 10

A lubricating oil composition comprising a major amount of mineral lubricating oil and about 0.1 to 10 wt. % of an oil soluble anionic-graft polymer having a number average molecular weight in the range of about 1,000 to 500,000 while containing in the range of about 0.005 to 2 wt. % nitrogen and being useful as an oil additive having dispersancy properties, said oil soluble polymer being a graft polymer of: 1. an anionically polymerizable monomer containing in the range of about 3 to 50 carbon atoms and at least one electron withdrawing group in such proximity to an olefinic bond that said bond is activated, said monomer being selected from the group consisting of: a. N,N (di C 1-10 hydrocarbyl) carbodiimides; b. monomers of the formula: ##STR7## wherein X is oxygen or an NR" group; n is 2 to 5; R' and R" are hydrogen or a C 1 to C 4 alkyl group; and R"' and R"" are C 1 to C 12 hydrocarbyl groups; and c. nitrile monomers of the formulae: ##STR8## wherein R v is hydrogen or lower alkyl and X is selected from the group consisting of hydrogen, halogen, cyano and lower alkyl; and, (2) an anion of an oxidized ethylene copolymer comprising about 20 to 80 mole % ethylene and about 20 to 80 mol % propylene.

Claim 11

A lubricating oil composition comprising a major amount of mineral lubricating oil and about 0.1 to 10 wt. % of an oil soluble anionic-graft polymer having a number average molecular weight in the range of about 1,000 to 500,000 while containing in the range of about 0.005 to 2 wt. % nitrogen and being useful as an oil additive having dispersancy properties, said oil soluble polymer being a graft polymer of: 1. an anionically polymerizable monomer containing in the range of about 3 to 50 carbon atoms and at least one electron withdrawing group in such proximity to an olefinic bond that said bond is activated, said monomer being selected from the group consisting of: a. N,N (di C 1-10 hydrocarbyl) carbodiimides; b. monomers of the formula: ##STR7## wherein X is oxygen or an NR" group; n is 2 to 5; R' and R" are hydrogen or a C 1 to C 4 alkyl group; and R"' and R"" are C 1 to C 12 hydrocarbyl groups; and c. nitrile monomers of the formulae: ##STR8## wherein R v is hydrogen or lower alkyl and X is selected from the group consisting of hydrogen, halogen, cyano and lower alkyl; and, (2) an anion of an oxidized ethylene copolymer comprising about 20 to 80 mole % ethylene and about 20 to 80 mol % propylene.

Claim 12

A lubricating oil composition according to claim 9, wherein said monomer is said N,N (di C 1-10 hydrocarbyl) carbodiimide.

Claim 13

A lubricating oil composition according to claim 10, wherein said monomer is N,N-diisopropylcarbodiimide.

Claim 14

A lubricating oil composition according to claim 9, wherein said monomer is said monomer (b).

Claim 15

A lubricating oil composition according to claim 12, wherein said monomer is N,N-dimethylaminoethyl methacrylate.

Claim 16

A lubricating oil composition according to claim 9, wherein said monomer is said nitrile monomer (c).

Claim 17

A lubricating oil composition according to claim 14, wherein said monomer is acrylonitrile.

Claim 18

A lubricating oil composition according to claim 9, wherein said molecular weight is in the range of 10,000 to 200,000; and said ethylene copolymer contains up to 20 mole %, based on the molar amount of ethylene and propylene units, of olefin selected from the group consisting of olefins of the formula RCH = CH 2 , where R is an aliphatic or cycloaliphatic radical of 2 to 48 carbons and diolefins of 4 to 26 carbon atoms.

Claim 19

A process of preparing an anionic-graft polymer comprising the steps of: 1. contacting an oxidized ethylene copolymer comprising about 20 to 80 mole % ethylene and about 20 to 80 mole % propylene, having an oxygen content of from about 0.005 to 6% based on the weight of said copolymer, with an alkyllithium compound of from 3 to 10 carbons under anhydrous conditions and inert atmosphere for a period of between 1 and 25 hours and at a temperature between about 20° C. and 100° C., whereby an anion of said oxidized ethylene copolymer is produced; and 2. contacting said anion with an anionically polymerizable monomer at a temperature between about 0° C. and about 100° C. and for a period of between about 0.2 and 15 hours in the presence of a base whereby an anionic-graft polymer is produced, and wherein said anionically polymerizable monomer is selected from the group consisting of: a. N,N (di C 1-10 hydrocarbyl) carbodiimides; b. monomers of the formula: ##STR9## wherein X is oxygen or an NR" group; n is 2 to 5; R' and R" are hydrogen or a C 1 to C 4 alkyl group; and R'" and R"" are C 1 to C 12 hydrocarbyl groups; and c. nitrile monomers of the formulae: ##STR10## wherein R v is hydrogen or lower alkyl and X is selected from the group consisting of hydrogen, halogen, cyano and lower alkyl.

Claim 20

A process of preparing an anionic-graft polymer comprising the steps of: 1. contacting an oxidized ethylene copolymer comprising about 20 to 80 mole % ethylene and about 20 to 80 mole % propylene, having an oxygen content of from about 0.005 to 6% based on the weight of said copolymer, with an alkyllithium compound of from 3 to 10 carbons under anhydrous conditions and inert atmosphere for a period of between 1 and 25 hours and at a temperature between about 20° C. and 100° C., whereby an anion of said oxidized ethylene copolymer is produced; and 2. contacting said anion with an anionically polymerizable monomer at a temperature between about 0° C. and about 100° C. and for a period of between about 0.2 and 15 hours in the presence of a base whereby an anionic-graft polymer is produced, and wherein said anionically polymerizable monomer is selected from the group consisting of: a. N,N (di C 1-10 hydrocarbyl) carbodiimides; b. monomers of the formula: ##STR9## wherein X is oxygen or an NR" group; n is 2 to 5; R' and R" are hydrogen or a C 1 to C 4 alkyl group; and R'" and R"" are C 1 to C 12 hydrocarbyl groups; and c. nitrile monomers of the formulae: ##STR10## wherein R v is hydrogen or lower alkyl and X is selected from the group consisting of hydrogen, halogen, cyano and lower alkyl.

Claim 21

A process according to claim 17, wherein said monomer is said N,N (di C 1-10 hydrocarbyl) carbodiimide.

Claim 22

A process according to claim 18, wherein said monomer is N,N-diisopropylcarbodiimide.

Claim 23

A process according to claim 17, wherein said monomer is said monomer (b).

Claim 24

A process according to claim 20, wherein said monomer is N,N-dimethylaminoethyl methacrylate.

Claim 25

A process according to claim 17, wherein said monomer is said nitrile monomer (c).

Claim 26

A process according to claim 22, wherein said monomer is acrylonitrile.

Claim 27

A process according to claim 17, wherein said molecular weight is in the range of 10,000 to 200,000 and said ethylene copolymer contains up to 20 mole %, based on the molar amount of ethylene and propylene units, of olefin selected from the group consisting of olefins of the formula RCH = CH 2 , where R is an aliphatic or cycloaliphatic radical of 2 to 48 carbons and diolefins of 4 to 26 carbon atoms.