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US4204972A
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Hydraulic fluids comprising nitrogen-containing boric acid esters
Assignee: Hoechst AG
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Filing: 1979-01-30
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Granted: 1980-05-27
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Expires: 1999-01-30
Abstract
Abstract Hydraulic fluids the primary properties of which comply with the official specifications and, moreover, which have a good lubricating effect, a high oxidation stability and a high acid stability consist of about 10 to 60% by weight of a nitrogen-containing boric acid ester, about 5 to 30% by weight of an alkyl-polyethylene glycol tert. butyl ether and about 35 to 75% by weight of a glycol monoalkyl ether. The nitrogen-containing boric acid ester is a reaction product of an alkoxylated monoalkyl amine, orthoboric acid and optionally a glycol.
Inventors
- 👤 Wolfgang Knoblauch
- 👤 Konrad von Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:01
CPC Classifications
C; C10; C10M; C10M111/00; C10M111/04; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/129; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/108; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/30; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10M2227/00; C10M2227/06; C10M2227/061; C10M2227/062; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
222 words
Hydraulic fluid essentially consisting of (A) about 10 to about 60% by weight of at least one nitrogen-containing boric acid ester of the following formulae I to III ##STR29## in which m and n each denotes an integer from 1 to 3, R denotes an alkyl group having from 1 to 9 carbon atoms, R 1 and R 2 denote hydrogen or methyl, R 3 denotes --CH 2 --CH 2 -- or --CH 2 CH 2 OCH 2 CH 2 -- and R 4 denotes hydrogen or a radical of the formula ##STR30## in which m, n, R, R 1 and R 2 have the aforesaid meaning and R' and R" each has one of the meanings of R; ##STR31## in which m, n, R, R', R 1 and R 2 have the aforesaid meaning; (B) about 5 to about 30% by weight of an alkyl polyethylene glycol tert.butyl ether of the formula ##STR32## in which R 5 denotes alkyl having from 1 to 4 carbon atoms and z is an integer from 2 to 10, and (C) about 35 to about 75% by weight of a glycol monoalkyl ether of the formula ##STR33## in which x denotes an integer from 2 to 5, R 6 denotes alkyl having from 1 to 4 carbon atoms and R 7 denotes hydrogen or methyl.
Claim 2
Dependent Claim
222 words
Hydraulic fluid essentially consisting of (A) about 10 to about 60% by weight of at least one nitrogen-containing boric acid ester of the following formulae I to III ##STR29## in which m and n each denotes an integer from 1 to 3, R denotes an alkyl group having from 1 to 9 carbon atoms, R 1 and R 2 denote hydrogen or methyl, R 3 denotes --CH 2 --CH 2 -- or --CH 2 CH 2 OCH 2 CH 2 -- and R 4 denotes hydrogen or a radical of the formula ##STR30## in which m, n, R, R 1 and R 2 have the aforesaid meaning and R' and R" each has one of the meanings of R; ##STR31## in which m, n, R, R', R 1 and R 2 have the aforesaid meaning; (B) about 5 to about 30% by weight of an alkyl polyethylene glycol tert.butyl ether of the formula ##STR32## in which R 5 denotes alkyl having from 1 to 4 carbon atoms and z is an integer from 2 to 10, and (C) about 35 to about 75% by weight of a glycol monoalkyl ether of the formula ##STR33## in which x denotes an integer from 2 to 5, R 6 denotes alkyl having from 1 to 4 carbon atoms and R 7 denotes hydrogen or methyl.
Claim 3
Dependent Claim
143 words
Hydraulic fluid as claimed in claim 1, wherein component A is a boric acid ester of formula I in which m and n denote 1 or 2, R denotes alkyl having from 3 to 9 carbon atoms, R 1 and R 2 denote hydrogen, R 3 denotes --CH 2 CH 2 -- and R 4 is hydrogen or ##STR34## or a boric acid ester of formula II in which m and n are 1 or 2, R, R' and R" are identical and each denotes alkyl having from 3 to 9 carbon atoms and R 1 and R 2 are hydrogen; component B is an alkyl polyethylene glycol tert.butyl ether of the defined formula in which z is an integer from 2 to 5; and component C is a glycol monoalkyl ether of the indicated formula in which x is 3 or 4.
Claim 4
Dependent Claim
34 words
Hydraulic fluid as claimed in claim 1, consisting of 20 to 40% by weight of component A, 5 to 20% by weight of component B and 50 to 69% by weight of component C.
Claim 5
Dependent Claim
19 words
Hydraulic fluid as claimed in claim 1, additionally containing 0.001 to 10% by weight of additives as component D.
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) | 1983-05-27 | 1983-11-26 | 1984-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-27 | 1987-11-26 | 1988-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-27 | 1991-11-26 | 1992-05-27 | $7700.00 | Window Closed / Lapsed |