US4136047A
Expired / Lapsed
US
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Viscosity index improvers
Assignee: Ethyl Corp
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Filing: 1977-11-08
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Granted: 1979-01-23
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Expires: 1997-11-08
Abstract
Abstract Block copolymers containing styrene, alpha-methylstyrene, 3,4-dimethyl-alpha-methylstyrene and lauryl methacrylate are useful as viscosity index improvers in lubricating oils.
Inventors
- 👤 John B. Rogan
- 👤 Steven A. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:34
CPC Classifications
C; C10; C10M; C10M143/00; C10M143/10; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C10M2205/00; C10M2205/04; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
74 words
A lubricating composition comprising a base mineral oil and a viscosity index improving amount of a viscosity index improver comprising a block copolymer having two or three block segments, having a molecular weight ranging from about 12,000 to 500,000 and having an Mw/Mn ratio less than 2, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene, and (b) from about 50 to 95 wt.% in blocks of 3,4-dimethyl-alpha-methylstyrene.
Claim 2
Dependent Claim
74 words
A lubricating composition comprising a base mineral oil and a viscosity index improving amount of a viscosity index improver comprising a block copolymer having two or three block segments, having a molecular weight ranging from about 12,000 to 500,000 and having an Mw/Mn ratio less than 2, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene, and (b) from about 50 to 95 wt.% in blocks of 3,4-dimethyl-alpha-methylstyrene.
Claim 3
Dependent Claim
20 words
the lubricating composition of claim 1 wherein the block copolymer has a molecular weight ranging from about 100,000 to 300,000.
Claim 4
Dependent Claim
24 words
The lubricating composition of claim 1 wherein the block copolymer contains from about 10 to 30 wt. % in blocks of styrene or alpha-methylstyrene.
Claim 5
Dependent Claim
17 words
The lubricating composition of claim 1 wherein the block copolymer has a Mw/Mn ratio less than 1.5.
Claim 6
Dependent Claim
22 words
The lubricating composition of claim 1 wherein the effective amount of viscosity index improver ranges from about 0.5 to 5 wt. %.
Claim 7
Dependent Claim
66 words
The lubricating composition of claim 5 wherein the viscosity index improver commprises a block copolymer having three block segments having a molecular weight ranging from about 100,000 to 300,000 and having a Mw/Mn ratio less than 1.5, which comprises from about 10 to 30 wt. % in outer blocks of styrene and (b) from about 70 to 90 wt. % in an inner block of 3,4-dimethyl-alpha-methylstyrene.
Claim 8
Dependent Claim
25 words
The lubricating composition of claim 6 wherein the block copolymer has a molecular weight of about 200,000 and which contains about 12 wt. % styrene.
Claim 9
Independent Claim
96 words
A method for improving the viscosity index of a lubricating composition comprising a base mineral oil, comprising adding to the composition an effective amount ranging from about 0.1 to 10 wt.% of a block copolymer having two or three block segments, having a molecular weight ranging from about 10,000 to 500,000 and having an Mw/Mn ratio less than 2, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene, and (b) from about 50 to 95 wt.% in blocks of 3,4-dimethyl-alpha-methylstyrene, such that the viscosity index of the composition is improved.
Claim 10
Independent Claim
96 words
A method for improving the viscosity index of a lubricating composition comprising a base mineral oil, comprising adding to the composition an effective amount ranging from about 0.1 to 10 wt.% of a block copolymer having two or three block segments, having a molecular weight ranging from about 10,000 to 500,000 and having an Mw/Mn ratio less than 2, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene, and (b) from about 50 to 95 wt.% in blocks of 3,4-dimethyl-alpha-methylstyrene, such that the viscosity index of the composition is improved.
Claim 11
Dependent Claim
49 words
The method of claim 8 wherein the viscosity index improver comprises a block copolymer having three block segments having a molecular weight ranging from about 100,000 to 300,000 and having a Mw/Mn ratio less than 1.5, which contains from about 10 to 30 wt. % in styrene or alpha-methylstyrene.
Claim 12
Dependent Claim
20 words
The method of claim 9 wherein the block copolymer contains outer blocks of styrene and an inner block of 3,4-dimethyl-alpha-methylstyrene.
Claim 13
Dependent Claim
48 words
A block copolymer having a molecular weight ranging from about 10,000 to 500,000 and having a Mw/Mn ratio less than 2.0, which comprises (a) from about 5 to 50 wt. % in blocks of styrene or alpha-methylstyrene and (b) from about 50 to 95% in blocks of 3,4-dimethyl-alpha-methylstyrene.
Claim 14
Dependent Claim
48 words
A block copolymer having a molecular weight ranging from about 10,000 to 500,000 and having a Mw/Mn ratio less than 2.0, which comprises (a) from about 5 to 50 wt. % in blocks of styrene or alpha-methylstyrene and (b) from about 50 to 95% in blocks of 3,4-dimethyl-alpha-methylstyrene.
Claim 15
Dependent Claim
22 words
The block copolymer of claim 11 having three block segments which contains outer blocks of styrene and an inner block of 3,4-dimethyl-alpha-methylstyrene.
Claim 16
Dependent Claim
75 words
A lubricating composition comprising a base mineral oil and a viscosity index improving amount of a viscosity index improver comprising a block copolymer having two or three block segments having a molecular weight ranging from about 10,000 to 500,000 and having an Mw/Mn ratio less than 2, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene and (b) from about 50 to 95 wt.% in blocks of lauryl methacrylate.
Claim 17
Dependent Claim
75 words
A lubricating composition comprising a base mineral oil and a viscosity index improving amount of a viscosity index improver comprising a block copolymer having two or three block segments having a molecular weight ranging from about 10,000 to 500,000 and having an Mw/Mn ratio less than 2, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene and (b) from about 50 to 95 wt.% in blocks of lauryl methacrylate.
Claim 18
Dependent Claim
63 words
The lubricating composition of claim 13 wherein the viscosity index improver comprises a block copolymer having a molecular weight ranging from about 10,000 to 300,000 and having an Mw/Mn ratio less than 1.5, which comprises (a) from about 10 to 30 wt.% in an inner block block of styrene and (b) from about 70 to 90 wt.% in outer blocks of lauryl methacrylate.
Claim 19
Dependent Claim
17 words
The lubricating composition of claim 13 wherein the block copolymer has a molecular weight of about 200,000.
Claim 20
Independent Claim
98 words
A method for improving the viscosity index of a lubricating composition comprising a base mineral oil comprising adding to the composition an effective amount ranging from about 0.1 to 10 wt. % of a block copolymer having two or three block segments, having a molecular weight ranging from about 10,000 to 500,000 and having an Mw/Mn ratio less than 2, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene, and (b) from about 50 to 95 wt.% in blocks of lauryl methacrylate, such that the viscosity index of the composition is improved.
Claim 21
Independent Claim
98 words
A method for improving the viscosity index of a lubricating composition comprising a base mineral oil comprising adding to the composition an effective amount ranging from about 0.1 to 10 wt. % of a block copolymer having two or three block segments, having a molecular weight ranging from about 10,000 to 500,000 and having an Mw/Mn ratio less than 2, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene, and (b) from about 50 to 95 wt.% in blocks of lauryl methacrylate, such that the viscosity index of the composition is improved.
Claim 22
Dependent Claim
21 words
The method of claim 16 wherein the block copolymer contains an inner block of styrene and outer blocks of lauryl methacrylate.
Claim 23
Dependent Claim
56 words
A block copolymer having two or three block segments, having a molecular weight ranging from about 10,000 to 500,000 and having an Mw/Mn ratio less than 2.0, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene and (b) from about 50 to 95 wt. % in blocks of lauryl methacrylate.
Claim 24
Dependent Claim
56 words
A block copolymer having two or three block segments, having a molecular weight ranging from about 10,000 to 500,000 and having an Mw/Mn ratio less than 2.0, which comprises (a) from about 5 to 50 wt.% in blocks of styrene or alpha-methylstyrene and (b) from about 50 to 95 wt. % in blocks of lauryl methacrylate.
Claim 25
Dependent Claim
23 words
The block copolymer of claim 18 having three block segments which contain an inner block of styrene and outer blocks of lauryl methacrylate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |