US4412087A — Viscosity index improver with high thickening pow…

Claim 1

Independent Claim 92 words

Shear-stable, mineral oil-based compositions comprising a major amount of a mineral base oil, and a minor effective viscosity improving amount of an oil-soluble hydrogenated conjugated diene/monovinylarene random block copolymer dissolved therein, said copolymer characterized by: polymerized conjugated diene content: 44-70 weight percent total copolymerized monovinylarene content: 56-30 weight percent block monovinylarene content: 9-23 weight percent molecular weight M n : 94,000-199,000 vinyl, before hydrogenation, based on conjugated diene: 30-51 weight percent vinyl, before hydrogenation, based on entire copolymer: 13-33 weight percent weight percent vinyl, based on copolymer, plus weight percent monovinylarene: 60-72.

Claim 2

Dependent Claim 92 words

Shear-stable, mineral oil-based compositions comprising a major amount of a mineral base oil, and a minor effective viscosity improving amount of an oil-soluble hydrogenated conjugated diene/monovinylarene random block copolymer dissolved therein, said copolymer characterized by: polymerized conjugated diene content: 44-70 weight percent total copolymerized monovinylarene content: 56-30 weight percent block monovinylarene content: 9-23 weight percent molecular weight M n : 94,000-199,000 vinyl, before hydrogenation, based on conjugated diene: 30-51 weight percent vinyl, before hydrogenation, based on entire copolymer: 13-33 weight percent weight percent vinyl, based on copolymer, plus weight percent monovinylarene: 60-72.

Claim 3

Dependent Claim 24 words

The oil based composition according to claim 1, wherein said conjugated diene of said random block copolymer is 1,3-butadiene and said monovinylarene is styrene.

Claim 4

Dependent Claim 90 words

Shear-stable, mineral oil based compositions comprising a major amount of an mineral base oil, and a minor effective viscosity-improving amount of an oil-soluble butadiene/styrene random block copolymer dissolved therein, said copolymer characterized by: polymerized butadiene content: 52.2-69.9 weight percent total copolymerized styrene content: 47.8-30.1 weight percent block styrene content: 9.3-21.0 weight percent molecular weight, M n : 94,000-199,000 vinyl, before hydrogenation, based on butadiene: 32.4-51.3 weight percent vinyl, before hydrogenation based on entire copolymer: 16.9-33.4 weight percent weight percent vinyl, based on copolymer, plus weight percent styrene: 59.8-7.15 weight percent.

Claim 5

Dependent Claim 90 words

Shear-stable, mineral oil based compositions comprising a major amount of an mineral base oil, and a minor effective viscosity-improving amount of an oil-soluble butadiene/styrene random block copolymer dissolved therein, said copolymer characterized by: polymerized butadiene content: 52.2-69.9 weight percent total copolymerized styrene content: 47.8-30.1 weight percent block styrene content: 9.3-21.0 weight percent molecular weight, M n : 94,000-199,000 vinyl, before hydrogenation, based on butadiene: 32.4-51.3 weight percent vinyl, before hydrogenation based on entire copolymer: 16.9-33.4 weight percent weight percent vinyl, based on copolymer, plus weight percent styrene: 59.8-7.15 weight percent.

Claim 6

Dependent Claim 49 words

The oil based composition according to claim 1 wherein the mineral oil is lubricating oil and has a viscosity at 210° F.-212° F. in the range of about 72 to 76 SUS, and said random block copolymer is employed in a range of about 0.8 to 1.6 weight percent.

Claim 7

Dependent Claim 36 words

The oil based composition according to claim 3 wherein said random block copolymer is employed in an amount in the range of about 1.0 to 2.1 weight percent relative to the total oil excluding other additives.

Claim 8

Dependent Claim 29 words

The oil based composition according to claim 1 wherein said random block copolymer is a copolymer of isoprene and styrene, butadiene and alpha-methyl styrene, or isoprene and alpha-methyl styrene.

Claim 9

Dependent Claim 46 words

The oil based composition according to claim 1 wherein said random block copolymer is selected from copolymers represented by B/A-A, A/B-A, wherein B/A and A/B each represent a randomized block of conjugated diene/monovinylarene which can be tapered, and A represents a homopolymeric block of polymerized monovinylarene.

Claim 10

Dependent Claim 37 words

The oil based composition of claim 4 wherein said base oil is a lubricating oil, and said random block copolymer is employed in an amount of about 0.8 to 1.2 weight percent relative to said base oil.

Claim 11

Dependent Claim 33 words

The oil based composition of claim 4 wherein said base oil is an automotive transmission fluid wherein said random block copolymer is employed in an amount of about 0.4 to 1.0 weight percent.

Claim 12

Dependent Claim 32 words

The oil based composition of claim 4 wherein said base oil is an aviation oil wherein said random block copolymer is employed in an amount of about 0.3 to 0.8 weight percent.

Claim 13

Dependent Claim 82 words

Hydrogenated random block copolymer characterized by: polymerized conjugated diene content: 44.1-69.9 weight percent copolymerized monovinylarene content: 55.9-30.1 weight percent block monovinylarene content: 9.3-23.2 weight percent molecular weight M n : 94,000-199,000 vinyl, before hydrogenation, based on conjugated diene: 30.2-51.3 weight percent vinyl, before hydrogenation, based on entire copolymer: 13.3-33.4 weight percent weight percent vinyl, based on copolymer, plus weight percent monovinylarene: 59.8-71-5 wherein the extent of hydrogenation is sufficient to substantially saturate olefinic double bonds, without substantial saturation of aromatic double bonds.

Claim 14

Dependent Claim 82 words

Hydrogenated random block copolymer characterized by: polymerized conjugated diene content: 44.1-69.9 weight percent copolymerized monovinylarene content: 55.9-30.1 weight percent block monovinylarene content: 9.3-23.2 weight percent molecular weight M n : 94,000-199,000 vinyl, before hydrogenation, based on conjugated diene: 30.2-51.3 weight percent vinyl, before hydrogenation, based on entire copolymer: 13.3-33.4 weight percent weight percent vinyl, based on copolymer, plus weight percent monovinylarene: 59.8-71-5 wherein the extent of hydrogenation is sufficient to substantially saturate olefinic double bonds, without substantial saturation of aromatic double bonds.

Claim 15

Dependent Claim 18 words

A hydrogenated copolymer according to claim 11 wherein said monovinylarene is styrene and said conjugated diene is 1,3-butadiene.

Claim 16

Dependent Claim 68 words

The hydrogenated random block copolymer according to claim 12 characterized by: polymerized butadiene content: 52.2-69.9 weight percent total copolymerized styrene content: 47.8-30.1 weight percent block styrene content: 9.3-21.0 weight percent molecular weight, M n : 94,000-199,000 vinyl, before hydrogenation, based on butadiene: 32.4-51.3 weight percent vinyl, before hydrogenation, based on entire copolymer: 16.9-33.4 weight percent weight percent vinyl, based on copolymer, plus weight percent styrene: 59.8-71.5 weight percent.

Claim 17

Dependent Claim 91 words

Mineral oil-based concentrates compositions comprising a major amount of a mineral base oil, and 5 to 30 weight percent of an oil-soluble hydrogenated conjugated diene/monovinylarene random block copolymer dissolved therein, said copolymer characterized by: polymerized conjugated diene content: 44.1-69.9 weight percent total copolymerized monovinylarene content: 55.9-30.1 weight percent block monovinylarene content: 9.3-23.2 weight percent molecular weight M n : 94,000-199,000 vinyl, before hydrogenation, based on conjugated diene: 30.2-51.3 weight percent vinyl, before hydrogenation, based on entire copolymer: 13.3-33.4 weight percent weight percent vinyl, based on copolymer, plus weight percent styrene: 59.8-71.5.

Claim 18

Dependent Claim 91 words

Mineral oil-based concentrates compositions comprising a major amount of a mineral base oil, and 5 to 30 weight percent of an oil-soluble hydrogenated conjugated diene/monovinylarene random block copolymer dissolved therein, said copolymer characterized by: polymerized conjugated diene content: 44.1-69.9 weight percent total copolymerized monovinylarene content: 55.9-30.1 weight percent block monovinylarene content: 9.3-23.2 weight percent molecular weight M n : 94,000-199,000 vinyl, before hydrogenation, based on conjugated diene: 30.2-51.3 weight percent vinyl, before hydrogenation, based on entire copolymer: 13.3-33.4 weight percent weight percent vinyl, based on copolymer, plus weight percent styrene: 59.8-71.5.

Claim 19

Dependent Claim 89 words

The oil based composition according to claim 14, wherein in said random block copolymer said conjugated diene is butadiene, said monovinylarene is styrene, and said butadiene/styrene random block copolymer is characterized by: polymerized butadiene content: 52.2-69.9 weight percent total copolymerized styrene content: 47.8-30.1 weight percent block styrene content: 9.3-21.0 weight percent molecular weight, M n : 94,000-199,000 vinyl, before hydrogenation based on butadiene: 32.4-51.3 weight percent vinyl, before hydrogenation, based on entire copolymer: 16.9-33.4 weight percent weight percent vinyl, based on copolymer, plus weight percent styrene: 59.8-71.5 weight percent.

Claim 20

Dependent Claim 29 words

The oil based concentrate according to claim 14, wherein the conjugated diene of said random block copolymer is 1,3-butadiene and the monovinylarene of said random block copolymer is styrene.

Claim 21

Dependent Claim 28 words

The concentrate composition according to claim 15 wherein said random block copolymer is the copolymer of isoprene and styrene, butadiene and alpha-methyl styrene, or isoprene and alpha-methyl styrene.

Claim 22

Dependent Claim 43 words

The oil-based composition according to claim 3 wherein said mineral base oil is a lubricating oil of about 72 SUS viscosity at 210°-212° F., and employing in said composition said random block copolymer in the range of about 0.8 to 1.6 weight percent.

Claim 23

Dependent Claim 18 words

The oil-based composition according to claim 1 employing about 1 to 2.1 weight percent said random block copolymer.

Claim 24

Dependent Claim 37 words

The oil based composition of claim 18 wherein said base oil is a lubricating oil, and said random block copolymer is employed in an amount of about 0.8 to 1.2 weight percent relative to said base oil.

Claim 25

Dependent Claim 33 words

The oil based composition of claim 18 wherein said base oil is an automotive transmission fluid wherein said random block copolymer is employed in an amount of about 0.4 to 1.0 weight percent.

Claim 26

Dependent Claim 32 words

The oil based composition of claim 18 wherein said base oil is an aviation oil wherein said random block copolymer is employed in an amount of about 0.3 to 0.8 weight percent.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-10-24	1987-04-25	1987-10-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-10-24	1991-04-25	1991-10-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-10-24	1995-04-25	1995-10-25	$7700.00	Window Closed / Lapsed

Viscosity index improver with high thickening power

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