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US4495075A
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US
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Methods and compositions for preventing the precipitation of zinc dialkyldithiophosphates which contain high percentages of a lower alkyl group
Assignee: Chevron USA Inc
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Filing: 1984-05-15
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Granted: 1985-01-22
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Expires: 2004-05-15
Abstract
Abstract Precipitation of a zinc dialkyldithiophosphate prepared from a mixture of about 50 to 90 mole percent of a lower alcohol plus 50 to 10 mole percent of a higher alcohol may be prevented by the addition to the composition of from about 0.5 to 10.0 percent by weight of an alkyl or alkenyl mono- or bis-succinimide.
Inventors
- 👤 Thomas F. Buckley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:44
CPC Classifications
C; C10; C10M; C10M141/00; C10M141/10; C07; C07F; C07F9/00; C07F9/02; C07F9/025; C10M133/00; C10M133/52; C10M133/56; C10M137/00; C10M137/02; C10M137/04; C10M137/10; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/086; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/04; C10M2217/046; C10M2217/06; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
An anti-oxidant anti-corrosion zinc dialkyldithiophosphate composition which is stable to precipitation which comprises: (a) a zinc dialkyldithiophosphate prepared from the reaction of phosphorus pentasulfide with a mixture of about 50 to 90 percent of a lower alcohol plus about 50 to 10 percent of a higher alcohol followed by neutralization of the resulting dialkyldithiophosphoric acid with a basically reacting zinc compound; and (b) about 0.1 to 10.0 percent by weight to the zinc dialkyldithiophosphate of an oil-soluble alkenyl or alkyl mono- or bis-succinimide of the formula: ##STR8## wherein X is amino or a group of the formula: ##STR9## R 7 is an alkenyl or alkyl group containing from about 20 to 60 carbon atoms; U is alkylene containing 2 to 6 carbon atoms; and n is an integer of from 0 to 6.
Claim 2
Dependent Claim
133 words
An anti-oxidant anti-corrosion zinc dialkyldithiophosphate composition which is stable to precipitation which comprises: (a) a zinc dialkyldithiophosphate prepared from the reaction of phosphorus pentasulfide with a mixture of about 50 to 90 percent of a lower alcohol plus about 50 to 10 percent of a higher alcohol followed by neutralization of the resulting dialkyldithiophosphoric acid with a basically reacting zinc compound; and (b) about 0.1 to 10.0 percent by weight to the zinc dialkyldithiophosphate of an oil-soluble alkenyl or alkyl mono- or bis-succinimide of the formula: ##STR8## wherein X is amino or a group of the formula: ##STR9## R 7 is an alkenyl or alkyl group containing from about 20 to 60 carbon atoms; U is alkylene containing 2 to 6 carbon atoms; and n is an integer of from 0 to 6.
Claim 3
Dependent Claim
17 words
The composition of claim 1 wherein said lower alcohol is isopropanol and said higher alcohol is 2-ethylhexanol.
Claim 4
Dependent Claim
27 words
The composition of claim 2 wherein said zinc dialkyldithiophosphate is prepared from an alcohol mixture comprising about 70 mole percent isopropanol and about 30 mole percent 2-ethylhexanol.
Claim 5
Dependent Claim
19 words
The composition of claim 3 wherein n in said alkenyl or alkyl mono- or bis-succinimide is 2 or 3.
Claim 6
Dependent Claim
13 words
The composition of claim 4 wherein U is ethylene and X is amino.
Claim 7
Dependent Claim
35 words
The composition of claim 4 wherein U is ethylene and X is a group of the formula: ##STR10## wherein R 7 is an alkenyl or alkyl group containing from about 20 to 60 carbon atoms.
Claim 8
Independent Claim
129 words
A method of preventing precipitation in a zinc dialkyldithiophosphate composition prepared from reacting phosphorus pentasulfide with a mixture of about 50 to 90 mole percent of a lower alcohol and 50 to 10 mole percent of a higher alcohol followed by neutralization of the resulting dialkyldithiophosphoric acid with a basically reacting zinc compound which comprises the addition of about 0.5 percent to about 10.0 percent by weight to the zinc dialkyldithiophosphate of an alkyl or alkenyl mono- or bis-succinimide of the formula: ##STR11## wherein X is amino or a group of the formula: ##STR12## R 7 is an alkenyl or alkyl group containing from about 20 to 60 carbon atoms; U is alkylene containing 2 to 6 carbon atoms; and n is an integer of from 0 to 6.
Claim 9
Independent Claim
129 words
A method of preventing precipitation in a zinc dialkyldithiophosphate composition prepared from reacting phosphorus pentasulfide with a mixture of about 50 to 90 mole percent of a lower alcohol and 50 to 10 mole percent of a higher alcohol followed by neutralization of the resulting dialkyldithiophosphoric acid with a basically reacting zinc compound which comprises the addition of about 0.5 percent to about 10.0 percent by weight to the zinc dialkyldithiophosphate of an alkyl or alkenyl mono- or bis-succinimide of the formula: ##STR11## wherein X is amino or a group of the formula: ##STR12## R 7 is an alkenyl or alkyl group containing from about 20 to 60 carbon atoms; U is alkylene containing 2 to 6 carbon atoms; and n is an integer of from 0 to 6.
Claim 10
Dependent Claim
17 words
The method of claim 7 wherein said lower alcohol is isopropanol and said higher alcohol is 2-ethylhexanol.
Claim 11
Dependent Claim
27 words
The method of claim 8 wherein said zinc dialkyldithiophosphate is prepared from an alcohol mixture comprising about 70 mole percent isopropanol and about 30 mole percent 2-ethylhexanol.
Claim 12
Dependent Claim
19 words
The method of claim 9 wherein n in said alkenyl or alkyl mono- or bis-succinimide is 2 or 3.
Claim 13
Dependent Claim
13 words
The method of claim 9 wherein U is ethylene and X is amino.
Claim 14
Dependent Claim
35 words
The method of claim 9 wherein U is ethylene and X is a group of the formula: ##STR13## wherein R 7 is an alkenyl or alkyl group containing from about 20 to 60 carbon atoms.
Claim 15
Dependent Claim
26 words
A lubricating oil concentrate comprising a minor amount of an oil of lubricating viscosity and a major amount of an anti-oxidant anti-corrosion composition of claim 1.
Claim 16
Dependent Claim
26 words
A lubricating oil concentrate comprising a minor amount of an oil of lubricating viscosity and a major amount of an anti-oxidant anti-corrosion composition of claim 5.
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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) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |