Title: Viscosity index improver with high thickening power

I claim:

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

11. 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.

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

13. 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.

14. 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.

15. 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.

16. 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.

17. 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.

18. 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.

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

20. 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.

21. 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.

22. 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.


Other info:


Inventors: Trepka, William J. (Bartlesville, OK)

Application Number: 06/331421
Filing Date: 1981-12-16
Publication_date: 1983-10-25
Assignee: PHILLIPS PETROLEUM CO (US)

Primary Class(es): 585/12 252/32.7E, 252/51.5A
Other Classes: C08C19/02; C08F8/04; C10M143/00; C08C19/00; C08F8/00; C10M1/18
US Patent Ref:

2798853	July, 1957	Young et al.	Lubricant containing hydrogenated liquid polymer oils
2864809	December, 1958	Jones et al.	Hydrogenated polybutadiene and process for producing same
2975160	March, 1961	Zelinski	Preparation of copolymers in the presence of an organo-lithium catalyst and a solvent mixture compri
3333024	July, 1967	Haefele et al.	Block polymers, compositions containing them and process of their preparation
3402159	September, 1968	Hsieh	Process for polymerizing butadiene and styrene terminated in short blocks of polystyrene
3419365	December, 1968	Streets	Petroleum distillates containing butadiene-styrene copolymers
3431323	March, 1969	Jones	HYDROGENATED BLOCK COPOLYMERS OF BUTADIENE AND A MONOVINYL ARYL HYDROCARBON
3531450	September, 1970	Yoshimoto et al.	THREE COMPONENT HYDROGENATION CATALYSTS AND A PROCESS FOR HYDROGENATING POLYMERS BY THE USE OF THEM
3547821	December, 1970	McCoy et al.	HYDROCARBON LUBRICATING OIL CONTAINING A POLYMER OF A CONJUGATED DIOLEFIN AS A VISCOSITY INDEX IMPRO
3554911	January, 1971	Schiff et al.
3600311	August, 1971	Nakman et al.
3630905	December, 1971	Sorgo
3752767	August, 1973	Eckert
3761404	September, 1973	Calow et al.
3772169	November, 1973	Small et al.	OIL COMPOSITIONS
3772196	November, 1973	St. Clair et al.	252/32.7E	LUBRICATING COMPOSITIONS
3994815	November, 1976	Coleman	252/52R	Additive concentrates and lubricating compositions containing these concentrates
4073738	February, 1978	Ladenberger et al.	Lubricating oil compositions containing alkyl acrylate or methacrylate polymers and copolymers of st
4145298	March, 1979	Trepka	Hydrogenated lithiated copolymers grafted with organic nitrogen compounds as viscosity index improve
4162985	July, 1979	Holubee	Multigrade lubricants containing interpolymers

Other Refs: GB1567654

May, 1980

Other References: Gruse et al., Chemical Technology of Petroleum (McGraw-Hill 1960), pp. 15, 16, 52, 53.

Primary Examiner: Howard, Jacqueline V.
Assistant Examiner:
Attorney: Burns, Doane, Swecker & Mathis