US4033887A
Expired / Lapsed
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Phosphoric acid ester based functional fluids
Assignee: Labofina SA
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Filing: 1975-05-16
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Granted: 1977-07-05
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Expires: 1995-05-16
Abstract
Abstract A functional fluid comprising a mixture of (A) an orthophosphoric acid ester of the formula O = P = (OR) 3 , wherein the groups R, which may be the same or different, are an alkyl radical, an aryl radical or an alkylaryl radical and (B) a transesterification product between a dihydroxy aromatic compound and a phosphorous compound selected from the group consisting of the phosphorous acid ester ##STR1## wherein R 1 , and R 2 and R 3 , which may be the same or different, are alkyl radicals, aryl radicals or alkylaryl radicals. The structural units, and their molecular weight may vary from about 500 to about 2000.
Inventors
- 👤 Alain J. G. De Roocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:23
CPC Classifications
C; C10; C10M; C10M3/00; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/026; C10M2211/00; C10M2211/02; C10M2211/024; C10M2211/06; C10M2219/00; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
A functional fluid comprising a mixture of a major amount of (A) an orthophosphoric acid ester of formula O= P= (OR) 3 , wherein R is an alkyl radical, an aryl radical or an alkylaryl radical, and a viscosity improving amount of (B) a transesterification product between a dihydroxy aromatic compound selected from the group consisting of hydroquinone, resorcinol, pyrocatechol, 2,2'bis (4-hydroxy-phenyl)propane and bis(4-hydroxyphenyl) methane and a phosphorous compound selected from the group consisting of the phosphorous acid ester ##STR6## wherein R 1 , R 2 and R 3 , which may be the same or different, are alkyl radicals, aryl radicals or alkylaryl radicals, wherein said transesterification product contains not more than about 4 structural units and has a molecular weight of between about 500 and 2000.
Claim 2
Dependent Claim
128 words
A functional fluid comprising a mixture of a major amount of (A) an orthophosphoric acid ester of formula O= P= (OR) 3 , wherein R is an alkyl radical, an aryl radical or an alkylaryl radical, and a viscosity improving amount of (B) a transesterification product between a dihydroxy aromatic compound selected from the group consisting of hydroquinone, resorcinol, pyrocatechol, 2,2'bis (4-hydroxy-phenyl)propane and bis(4-hydroxyphenyl) methane and a phosphorous compound selected from the group consisting of the phosphorous acid ester ##STR6## wherein R 1 , R 2 and R 3 , which may be the same or different, are alkyl radicals, aryl radicals or alkylaryl radicals, wherein said transesterification product contains not more than about 4 structural units and has a molecular weight of between about 500 and 2000.
Claim 3
Dependent Claim
68 words
The functional fluid of claim 1, wherein the orthophosphoric acid ester is an ester of formula O= P.tbd. (OR) 3 , wherein each R, which may be the same or different is an alkyl radical having from 1 to 8 carbon atoms, C 6 aryl radical or an alkylaryl radical wherein the alkyl substituent has 1 to 8 carbon atoms and the aryl portion has 6 carbon atoms.
Claim 4
Dependent Claim
92 words
The functional fluid of claim 1, wherein the transesterification product is the transesterification product of a dihydroxy aromatic compound and a phosphorous compound selected from the group consisting of the phosphorous acid ester ##STR7## and the phosphoric acid ester ##STR8## wherein the R 1 , R 2 and R 3 radicals, which may be the same or different, are alkyl radicals having 1 to 12 carbon atoms, C 6 aryl radicals or alkylaryl radical wherein the alkyl substituent has 1 to 8 carbon atoms and the aryl portion has 6 carbon atoms.
Claim 5
Dependent Claim
26 words
The functional fluid of claim 3, wherein said phosphorous compound is a phosphoric acid ester containing at least two of said aryl radicals or alkylaryl radicals.
Claim 6
Dependent Claim
26 words
The functional fluid of claim 3, wherein said phosphorous compound is a phosphoric acid ester containing at least two of said aryl radicals or alkylaryl radicals.
Claim 7
Dependent Claim
50 words
The functional fluid of claim 1, wherein said transesterification product is the product of a dihydroxy aromatic compound selected from the group consisting of hydroquinone, resorcinol, pyrocatechol, 2,2'bis(4-hydroxyphenyl)propane and bis(4-hydroxyphenyl)methane, and a phosphoric acid ester selected from the group consisting of triphenyl phosphate, tricresyl phosphate, trixylyl phosphate, tri(m-ethylphenyl)phosphate and diphenyl-decyl-phosphate.
Claim 8
Dependent Claim
30 words
The functional fluid of claim 1, comprising an orthophosphoric acid ester and said transesterification product in an amount of between 1 and 50% based on the weight of said ester.
Claim 9
Dependent Claim
25 words
The functional fluid of claim 7, comprising said transesterification product in an amount of 1 to 20% based on the weight of orthophosphoric acid ester.
Claim 10
Dependent Claim
41 words
The functional fluid of claim 1, further comprising 5 to 30% by weight based on the total composition of chlorinated biphenyl in admixture with said mixture of orthophosphoric acid ester and transesterification product, said mixture being soluble in said chlorinated biphenyl.
Claim 11
Dependent Claim
21 words
The functional fluid of claim 1, wherein said transesterification product has the formula ##STR9## where n is 1, 2, or 3.
Claim 12
Dependent Claim
16 words
The functional fluid of claim 1, wherein said transesterification product contains 3 or 4 structural units.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |