US4749505A — Olefin polymer viscosity index improver additive …

Claim 1

Independent Claim 48 words

A process for producing a viscosity index improver additive useful in lubricating oil compositions comprising degrading an olefin polymer in the substantial absence of a solvent under inert atmosphere by heating in the presence of a free radical initiator sufficient to decrease the molecular weight of said polymer.

Claim 2

Dependent Claim 48 words

A process for producing a viscosity index improver additive useful in lubricating oil compositions comprising degrading an olefin polymer in the substantial absence of a solvent under inert atmosphere by heating in the presence of a free radical initiator sufficient to decrease the molecular weight of said polymer.

Claim 3

Dependent Claim 34 words

A process according to claim 1, wherein said free radical initiator is a peroxide and said degradation is carried out in the presence of an acid catalyst which activates the decomposition of said peroxide.

Claim 4

Dependent Claim 13 words

A process according to claim 2, wherein said acid catalyst is maleic anhydride.

Claim 5

Dependent Claim 23 words

A process according to claim 1 or 3, wherein said polymer and initiator are subjected to mechanical mixing and shear during said heating.

Claim 6

Dependent Claim 28 words

A process according to claim 1 or 4, wherein said polymer is heated and degraded in the presence of said free radical initiator and a chain stopping agent.

Claim 7

Dependent Claim 65 words

A process according to claim 5, wherein said polymer is degraded in molecular weight and grafted with an unsaturated material selected from the group consisting of (A) ethylenically unsaturated C 3 to C 10 carboxylic acid having 1 to 2 carboxylic acid groups or an anhydride group and (B) nitrogen-containing ethylenically unsaturated monomers containing 6 to 30 carbon atoms and 1 to 4 nitrogen groups.

Claim 8

Dependent Claim 14 words

A process according to claim 6, wherein degradation and grafting are carried out simultaneously.

Claim 9

Dependent Claim 18 words

A process according to claim 6, wherein said polymer is degraded in molecular weight and is then grafted.

Claim 10

Dependent Claim 102 words

A process according to claim 6, wherein said olefin polymer is a copolymer consisting essentially of ethylene and propylene having a T.E. of at least 2.0 which has been reduced in molecular weight to a T.E. of about 1.0 to 1.8 by degrading under an oxygen-free atmosphere by heating to about 120° to about 250° C. in the presence of a peroxide, grafting with maleic anhydride in the presence of said peroxide, followed by dissolving the maleic anhydride polymer in oil and reacting with an amine to form a V.I.-dispersant additive inhibited against a viscosity increasing interaction with lubricating oil ashless dispersants.

Claim 11

Dependent Claim 112 words

A process comprising degrading an oil-soluble ethylene copolymer comprising about 15 to 90 weight % ethylene and about 10 to 85 weight % of C 3 to C 28 alpha-olefin, said copolymer having a number average molecular weight within the range of about 5,000 to 500,000 and grafting with an unsaturated material selected from the group consisting of: (A) ethylenically unsaturated C 3 to C 10 carboxylic acid having 1 to 2 carboxylic acid groups or an anhydride group, and (B) nitrogen-containing ethylenically unsaturated monomers containing 6 to 30 carbon atoms and 1 to 4 nitrogen atoms, in the presence of a free radical initiator and a chain stopping agent under nitrogen.

Claim 12

Dependent Claim 112 words

A process comprising degrading an oil-soluble ethylene copolymer comprising about 15 to 90 weight % ethylene and about 10 to 85 weight % of C 3 to C 28 alpha-olefin, said copolymer having a number average molecular weight within the range of about 5,000 to 500,000 and grafting with an unsaturated material selected from the group consisting of: (A) ethylenically unsaturated C 3 to C 10 carboxylic acid having 1 to 2 carboxylic acid groups or an anhydride group, and (B) nitrogen-containing ethylenically unsaturated monomers containing 6 to 30 carbon atoms and 1 to 4 nitrogen atoms, in the presence of a free radical initiator and a chain stopping agent under nitrogen.

Claim 13

Dependent Claim 47 words

A process according to claim 10, wherein said copolymer is degraded and grafted with said unsaturated material by mixing under shearing stress and under nitrogen said copolymer, unsaturated material, free radical initiator and chain stopper at about 120° to 250° C. for about 0.005 to 12 hours.

Claim 14

Dependent Claim 24 words

A process according to claims 1 or 11 wherein the degraded material is subsequently mixed with mineral lubricating oil to form an oil concentrate.

Claim 15

Dependent Claim 61 words

A process according to claim 6, wherein said polymer is degraded in the presence of about 0.1 to 10 wt. % of said unsaturated material, about 0.05 to 10 wt. % of said chain stopping material and about 0.005 to 1 wt. % of said free radical initiator, all of said weight percents being based upon the weight of said copolymer.

Claim 16

Dependent Claim 87 words

A process for forming a V.I.-dispersant additive for lubricating oil comprising heating and degrading in an inert atmosphere an oil-soluble ethylene-propylene V.I. improving solid rubber copolymer having a T.E of 2.0 and higher to a T.E. of 1.8 or less by heating to 120° C. to 250° C. and mixing the presence of a peroxide free radical generator, grafting said copolymer with maleic anhydride in the presence of said peroxide and a mercaptan chain stopping agent, and reacting said maleic anhydride grafted copolymer with tertiary N-propylamino morpholine.

Claim 17

Dependent Claim 87 words

A process for forming a V.I.-dispersant additive for lubricating oil comprising heating and degrading in an inert atmosphere an oil-soluble ethylene-propylene V.I. improving solid rubber copolymer having a T.E of 2.0 and higher to a T.E. of 1.8 or less by heating to 120° C. to 250° C. and mixing the presence of a peroxide free radical generator, grafting said copolymer with maleic anhydride in the presence of said peroxide and a mercaptan chain stopping agent, and reacting said maleic anhydride grafted copolymer with tertiary N-propylamino morpholine.

Claim 18

Dependent Claim 9 words

A product produced by the process of claim 1.

Claim 19

Dependent Claim 9 words

A product produced by the process of claim 2.

Claim 20

Dependent Claim 9 words

A product produced by the process of claim 3.

Claim 21

Dependent Claim 9 words

A product produced by the process of claim 4.

Claim 22

Dependent Claim 9 words

A product produced by the process of claim 5.

Claim 23

Dependent Claim 9 words

A product produced by the process of claim 6.

Claim 24

Dependent Claim 9 words

A product produced by the process of claim 7.

Claim 25

Dependent Claim 9 words

A product produced by the process of claim 8.

Claim 26

Dependent Claim 9 words

A product produced by the process of claim 9.

Claim 27

Dependent Claim 9 words

A product produced by the process of claim 10.

Claim 28

Dependent Claim 9 words

A product produced by the process of claim 11.

Claim 29

Dependent Claim 9 words

A product produced by the process of claim 12.

Claim 30

Dependent Claim 9 words

A product produced by the process of claim 13.

Claim 31

Dependent Claim 9 words

A product produced by the process of claim 14.

Claim 32

Dependent Claim 43 words

A lubricating oil composition comprising a major amount of lubricating oil and an oil-soluble V.I. improver prepared by degrading an olefin polymer under an inert atmosphere in the presence of a free radical initiator sufficient to reduce the molecular weight of said polymer.

Claim 33

Dependent Claim 43 words

A lubricating oil composition comprising a major amount of lubricating oil and an oil-soluble V.I. improver prepared by degrading an olefin polymer under an inert atmosphere in the presence of a free radical initiator sufficient to reduce the molecular weight of said polymer.

Claim 34

Dependent Claim 23 words

A lubricating oil composition according to claim 29, wherein said polymer and initiator are subjected to mechanical mixing and shear during said heating.

Claim 35

Dependent Claim 32 words

A lubricating oil composition according to claim 29, wherein said polymer is heated and mixed with a peroxide free radical initiator and an acid catalyst which activates the decomposition of said peroxide.

Claim 36

Dependent Claim 67 words

A lubricating oil composition according to claim 30, wherein said polymer is degraded in molecular weight and grafted with an unsaturated material selected from the group consisting of (A) ethylenically unsaturated C 3 to C 10 carboxylic acid having 1 to 2 carboxylic acid groups or an anhydride group and (B) nitrogen-containing ethylenically unsaturated monomers containing 6 to 30 carbon atoms and 1 to 4 nitrogen groups.

Claim 37

Dependent Claim 16 words

A lubricating oil composition according to claim 32, wherein degradation and grafting are carried out simultaneously.

Claim 38

Dependent Claim 20 words

A lubricating oil composition according to claim 27, wherein said polymer is degraded in molecular weight and is then grafted.

Claim 39

Dependent Claim 103 words

A lubricating oil composition according to claim 30, wherein said olefin polymer is a copolymer consisting essentially of ethylene and propylene having a T.E. of at least 2.0 which has been reduced in molecular weight to a T.E. of about 1.0 to 1.8 by degrading under an oxygen-free atmosphere by heating to about 120° to 250° C. in the presence of a peroxide, grafting with maleic anhydride in the presence of said peroxide, followed by dissolving the maleic anhydride polymer in oil and reacting with an amine to form a V.I.-dispersant additive inhibited against a viscosity increasing interaction with lubricating oil ashless dispersants.

Claim 40

Dependent Claim 126 words

A lubricating oil composition comprising a major amount of lubricating oil and a V.I.-dispersant additive prepared by degrading an oil-soluble ethylene copolymer comprising about 15 to 90 weight % ethylene and about 10 to 85 weight % of C 3 to C 28 alpha-olefin, said copolymer having a number average molecular weight within the range of about 5,000 to 500,000 and grafting with an unsaturated material selected from the group consisting of: (A) ethylenically unsaturated C 3 to C 10 carboxylic acid having 1 to 2 carboxylic acid groups or an anhydride group, and (B) nitrogen-containing ethylenically unsaturated monomers containing 6 to 30 carbon atoms and 1 to 4 nitrogen atoms, in the presence of a free radical initiator and a chain stopping agent under nitrogen.

Claim 41

Dependent Claim 126 words

A lubricating oil composition comprising a major amount of lubricating oil and a V.I.-dispersant additive prepared by degrading an oil-soluble ethylene copolymer comprising about 15 to 90 weight % ethylene and about 10 to 85 weight % of C 3 to C 28 alpha-olefin, said copolymer having a number average molecular weight within the range of about 5,000 to 500,000 and grafting with an unsaturated material selected from the group consisting of: (A) ethylenically unsaturated C 3 to C 10 carboxylic acid having 1 to 2 carboxylic acid groups or an anhydride group, and (B) nitrogen-containing ethylenically unsaturated monomers containing 6 to 30 carbon atoms and 1 to 4 nitrogen atoms, in the presence of a free radical initiator and a chain stopping agent under nitrogen.

Claim 42

Dependent Claim 49 words

A lubricating oil composition according to claim 36, wherein said copolymer is degraded and grafted with said unsaturated material by mixing under shearing stress and under nitrogen said copolymer, unsaturated material, free radical initiator and chain stopper at about 120° to 250° C. for about 0.005 to 12 hours.

Claim 43

Dependent Claim 36 words

A lubricating oil composition according to claim 29, wherein said degradation is carried out in the substantial absence of solvent, and the degraded material is subsequently mixed with mineral lubricating oil to form an oil concentrate.

Claim 44

Dependent Claim 62 words

A lubricating oil composition according to claim 32, wherein said polymer is degraded in the presence of about 0.1 to 10 wt. % of said unsaturated material, about 0.5 to 10 wt. % of chain stopping material and about 0.005 to 1 wt. % of said free radical initiator, all of said weight percents being based upon the weight of said copolymer.

Claim 45

Dependent Claim 91 words

A lubricating oil composition comprising a major amount of lubricating oil and a V.I.-dispersant prepared by heating and degrading in an inert atmosphre an oil-soluble ethylene-propylene V.I. improving solid rubber copolymer having a T.E. of 2.0 and higher to a T.E. of 1.8 or less by heating to 120° to 250° C. and mixing in the presence of a peroxide free radical generator, grafting said copolymer with maleic anhydride in the presence of said peroxide and a chain stopping agent, and reacting said maleic anhydride grafted copolymer with tertiary N-propylamino morpholine.

Claim 46

Dependent Claim 91 words

A lubricating oil composition comprising a major amount of lubricating oil and a V.I.-dispersant prepared by heating and degrading in an inert atmosphre an oil-soluble ethylene-propylene V.I. improving solid rubber copolymer having a T.E. of 2.0 and higher to a T.E. of 1.8 or less by heating to 120° to 250° C. and mixing in the presence of a peroxide free radical generator, grafting said copolymer with maleic anhydride in the presence of said peroxide and a chain stopping agent, and reacting said maleic anhydride grafted copolymer with tertiary N-propylamino morpholine.

Claim 47

Dependent Claim 40 words

A lubricating oil composition having a reduced tendency to viscosity increase due to additive interaction comprising an oil-soluble ashless dispersant and a polyolefin V.I. improver prepared by heating to degradation in the presence of a free radical initiator under nitrogen.

Claim 48

Dependent Claim 40 words

A lubricating oil composition having a reduced tendency to viscosity increase due to additive interaction comprising an oil-soluble ashless dispersant and a polyolefin V.I. improver prepared by heating to degradation in the presence of a free radical initiator under nitrogen.

Claim 49

Dependent Claim 13 words

A lubricating oil composition according to claim 41 which contains a metal detergent.

Claim 50

Dependent Claim 56 words

A process for producing a viscosity index improver additive useful in lubricating oil compositions comprising degrading an olefin polymer in the substantial absence of a solvent under an inert atmosphere by heating to about 120° C. to 125° C. in the presence of a free radical initiator sufficient to decrease the molecular weight of said polymer.

Claim 51

Dependent Claim 56 words

A process for producing a viscosity index improver additive useful in lubricating oil compositions comprising degrading an olefin polymer in the substantial absence of a solvent under an inert atmosphere by heating to about 120° C. to 125° C. in the presence of a free radical initiator sufficient to decrease the molecular weight of said polymer.

Claim 52

Dependent Claim 26 words

A process according to claim 1 or claim 43 wherein said free radical initiator is present in the amount of about 0.05 to 0.5 wt. %.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-06-07	1991-12-07	1992-06-07	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-06-07	1995-12-07	1996-06-07	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-06-07	1999-12-07	2000-06-07	$7700.00	Window Closed / Lapsed

Olefin polymer viscosity index improver additive useful in oil compositions

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