US4402844A — Viscosity index improvers with dispersant propert…

Claim 1

Independent Claim 142 words

Shear-stable, oil-based composition, comprising a major amount of an oil selected from mineral oils and synthetic oils, and a minor effective viscosity index improving amount of an oil soluble organo-substituted aminolactam grafted hydrogenated conjugated diene/monovinylarene copolymer dissolved therein; said copolymer prepared by the process which comprises a lithiating a hydrogenated conjugated diene hydrocarbon/monobinylarene hydrocarbon copolymer, and reacting the resulting lithiated hydrogenated copolymer with an effective amount of a substituted aminolactam, thereby preparing said grafted copolymer; wherein said substituted aminolactam is represented by ##STR2## wherein each R' represents hydrogen or an aliphatic, cycloaliphatic, aromatic radical, or combinations thereof; each R" represents an aliphatic, cycloaliphatic, or aromatic radical, or combinations thereof; n is an integer of 1 to 5 inclusive; m is an integer of 1 to 12; and the total number of carbon atoms in R' and R" substituents is 1 to 12.

Claim 2

Dependent Claim 142 words

Shear-stable, oil-based composition, comprising a major amount of an oil selected from mineral oils and synthetic oils, and a minor effective viscosity index improving amount of an oil soluble organo-substituted aminolactam grafted hydrogenated conjugated diene/monovinylarene copolymer dissolved therein; said copolymer prepared by the process which comprises a lithiating a hydrogenated conjugated diene hydrocarbon/monobinylarene hydrocarbon copolymer, and reacting the resulting lithiated hydrogenated copolymer with an effective amount of a substituted aminolactam, thereby preparing said grafted copolymer; wherein said substituted aminolactam is represented by ##STR2## wherein each R' represents hydrogen or an aliphatic, cycloaliphatic, aromatic radical, or combinations thereof; each R" represents an aliphatic, cycloaliphatic, or aromatic radical, or combinations thereof; n is an integer of 1 to 5 inclusive; m is an integer of 1 to 12; and the total number of carbon atoms in R' and R" substituents is 1 to 12.

Claim 3

Dependent Claim 56 words

A composition according to claim 1 wherein said grafted copolymer has a number average molecular weight in the range of about 20,000 to 300,000, a vinyl content prior to hydrogenation of about 20 to 95 weight percent, a diene:monovinylarene content of about 80:20 to 20:80, and a nitrogen content of about 0.01 to 5 weight percent.

Claim 4

Dependent Claim 48 words

A composition according to claim 2 wherein said grafted copolymer has a number average molecular weight in the range of about 25,000 to 100,000, about 50-65 weight percent monovinylarene and 50-35 weight percent diene, and a vinyl content prior to hydrogenation of about 20 to 70 weight percent.

Claim 5

Dependent Claim 48 words

A composition according to claim 3 wherein the mineral oil is a lubricating oil and has a viscosity at 210° F. in the range of about 30 to 250 SUS, and said grafted copolymer exhibits a nitrogen content in the range of about 0.05 to 0.5 weight percent.

Claim 6

Dependent Claim 33 words

A composition according to claim 4 wherein said grafted copolymer is employed in an amount in the range of about 0.5 to 10 volume percent relative to the total oil excluding other additives.

Claim 7

Dependent Claim 24 words

A composition according to claim 5 wherein said substituted lactam is selected from the group consisting of N-(N',N'-dimethylamino-ethyl)-γ-butyrolactam; N-(N',N'-dimethylamino-ethyl)-2-pyrrolidone; N-(N',N'-dimethylamino-propyl)-2-pyrrolidone; N-(N',N'-diethylamino-propyl)-2-pyrrolidone; N-(N',N'-dimethylamino-propyl)-3-methyl-2-pyrrolidone; and N-(N',N'-dimethylamino-propyl)-ε-caprolactam.

Claim 8

Dependent Claim 26 words

A composition according to claim 6 wherein said copolymer is a copolymer of butadiene and styrene, isoprene and styrene, butadiene and α-methylstyrene, or isoprene and α-methylstyrene.

Claim 9

Dependent Claim 35 words

The composition according to claim 7 wherein said hydrogenated copolymer is a 41/59 weight percent hydrogenated butadiene/styrene block copolymer having a block styrene content of about 20 weight percent, and said nitrogen-containing compound is N-(N',N'-dimethylamino-propyl)-2-pyrrolidone.

Claim 10

Dependent Claim 46 words

The composition of claim 1 wherein said copolymer is selected from copolymers represented by B/A, B/A-A, A-B, and mixtures, wherein B/A represents a randomized block of conjugated diene/monovinylarene, which can be tapered, A represents a block of poly(monovinylarene), and B represents a block of poly(conjugated diene).

Claim 11

Dependent Claim 30 words

The composition of claim 1 wherein said copolymer contains a random block B/A, and wherein the block polystyrene content is in the range of about 15 to 25 weight percent.

Claim 12

Dependent Claim 41 words

The composition of claim 1 wherein said base oil is a lubricating oil having a minimum VI of about 130, wherein said grafted copolymer is employed in an amount of about 0.5 to 5 volume percent relative to the base oil.

Claim 13

Dependent Claim 30 words

The composition of claim 1 wherein said base oil is an automotive transmission fluid wherein said grafted copolymer is employed in an amount of about 3 to 5 volume percent.

Claim 14

Dependent Claim 29 words

The composition of claim 1 wherein said base oil is an aviation oil wherein said grafted copolymer is employed in an amount of about 8 to 9 volume percent.

Claim 15

Dependent Claim 113 words

An oil soluble organo-substituted aminolactam grafted hydrogenated conjugated diene/monovinylarene copolymer prepared by the process which comprises lithiating a hydrogenated conjugated diene hydrocarbon/monovinylarene hydrocarbon copolymer, and reacting the resulting lithiated hydrogenated copolymer with an effective amount of a substituted aminolactam, thereby preparing said grafted copolymer; wherein said substituted aminolactam is represented by ##STR3## wherein each R' represents hydrogen or an aliphatic, cycloaliphatic, aromatic radical, or combinations thereof; each R" represents an aliphatic, cycloaliphatic, or aromatic radical, or combinations thereof; n is an integer of 1, 2, 3, 4, or 5; m is an integer of 1 to 12; and the total number of carbon atoms in R' and R" substituents is 1 to 12.

Claim 16

Dependent Claim 113 words

An oil soluble organo-substituted aminolactam grafted hydrogenated conjugated diene/monovinylarene copolymer prepared by the process which comprises lithiating a hydrogenated conjugated diene hydrocarbon/monovinylarene hydrocarbon copolymer, and reacting the resulting lithiated hydrogenated copolymer with an effective amount of a substituted aminolactam, thereby preparing said grafted copolymer; wherein said substituted aminolactam is represented by ##STR3## wherein each R' represents hydrogen or an aliphatic, cycloaliphatic, aromatic radical, or combinations thereof; each R" represents an aliphatic, cycloaliphatic, or aromatic radical, or combinations thereof; n is an integer of 1, 2, 3, 4, or 5; m is an integer of 1 to 12; and the total number of carbon atoms in R' and R" substituents is 1 to 12.

Claim 17

Dependent Claim 56 words

A composition according to claim 14 wherein said grafted copolymer has a number average molecular weight in the range of about 20,000 to 300,000, a vinyl content prior to hydrogenation of about 20 to 95 weight percent, a diene:monovinylarene content of about 80:20 to 20:80, and a nitrogen content of about 0.01 to 5 weight percent.

Claim 18

Dependent Claim 48 words

A composition according to claim 15 wherein said grafted copolymer has a number average molecular weight in the range of about 25,000 to 100,000, about 50-65 weight percent monovinylarene and 50-35 weight percent diene, and a vinyl content prior to hydrogenation of about 20 to 70 weight percent.

Claim 19

Dependent Claim 24 words

The composition according to claim 16 wherein said grafted copolymer exhibits a nitrogen content in the range of about 0.05 to 0.5 weight percent.

Claim 20

Dependent Claim 24 words

The composition according to claim 17 wherein said substituted lactam is selected from the group consisting of N-(N',N'-dimethylamino-ethyl)-γ-butyrolactam; N-(N',N'-dimethylamino-ethyl)-2-pyrrolidone; N-(N',N'-dimethylamino-propyl)-2-pyrrolidone; N-(N',N'-diethylamino-propyl)-2-pyrrolidone; N-(N',N'-dimethylamino-propyl)-3-methyl-2-pyrrolidone; and N-(N',N'-dimethylamino-propyl)-ε-caprolactam.

Claim 21

Dependent Claim 26 words

A composition according to claim 18 wherein said copolymer is a copolymer of butadiene and styrene, isoprene and styrene, butadiene and α-methylstyrene, or isoprene and α-methylstyrene.

Claim 22

Dependent Claim 35 words

The composition according to claim 19 wherein said hydrogenated copolymer is a 41/59 weight percent hydrogenated butadiene/styrene block copolymer having a block styrene content of about 20 weight percent, and said nitrogen-containing compound is N(N',N'-dimethylamino-propyl)-2-pyrrolidone.

Claim 23

Dependent Claim 46 words

The composition of claim 14 wherein said copolymer is selected from copolymers represented by B/A, B/A-A, A-B, and mixtures, wherein B/A represents a randomized block of conjugated diene/monovinylarene, which can be tapered, A represents homopolymeric block of poly(monovinylarene), and B represents a block of poly(conjugated diene).

Claim 24

Dependent Claim 30 words

The composition of claim 14 wherein said copolymer contains a random block B/A, and wherein the block polystyrene content is in the range of about 15 to 25 weight percent.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-09-05	1987-03-07	1987-09-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-09-05	1991-03-07	1991-09-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-09-05	1995-03-07	1995-09-06	$7700.00	Window Closed / Lapsed

Viscosity index improvers with dispersant properties prepared by reaction of lithiated hydrogenated copolymers with substituted aminolactams

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