US4051053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fluids comprising orthosilicate esters
Assignee: Castrol Ltd
•
Filing: 1976-04-22
•
Granted: 1977-09-27
•
Expires: 1996-04-22
Abstract
Abstract As novel compounds, orthosilicate esters having the general formula: ##STR1## wherein R 1 is a propylene glycol monoalkyl ether residue containing from 1 to 8 carbon atoms in the terminal alkyl group or is a tertiary alkyl group; each of R 2 , R 3 and R 4 is the same or different and is an ethylene or propylene glycol monoalkyl ether residue containing from 1 to 8 carbon atoms in the terminal alkyl group or is a tertiary alkyl group, provided that when R 1 is a propylene glycol monoalkyl ether residue each of R 2 , R 3 and R 4 are also propylene glycol monoalkyl ether residues; the total number of carbon atoms in R 1 , R 2 , R 3 and R 4 being at least 15 and at least one of R 1 , R 2 , R 3 and R 4 being a glycol monoalkyl ether residue. Also disclosed are hydraulic fluids containing the novel compounds.
Inventors
- 👤 John Scotchford Elliott
- 👤 Gerald John Joseph Jayne
- 👤 Herbert Frank Askew
- 👤 Colin John Harrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:13
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/06; C; C07; C07F; C07F7/00; C07F7/02; C07F7/04; C10; C10M; C10M3/00; C10M2201/00; C10M2201/08; C10M2201/081; C10M2201/082; C10M2201/083; C10M2201/084; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/023; C10M2207/024; C10M2207/026; C10M2207/04; C10M2207/046; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/123; C10M2207/125; C10M2207/129; C10M2207/22; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/287; C10M2207/288; C10M2207/30; C10M2207/34; C10M2207/40; C10M2207/402; C10M2207/404; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/107; C10M2209/109; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/044; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/30; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06; C10M2219/00; C10M2219/10; C10M2219/102; C10M2219/104; C10M2219/106; C10M2219/108; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2227/00; C10M2227/02; C10M2227/06; C10M2227/061; C10M2227/062; C10N; C10N2010/00; C10N2010/02; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
159 words
An orthosilicate ester having the general formula: ##STR11## wherein R 1 is selected from the group consisting of propylene glycol monoalkyl ether residues containing from 1 to 2 carbon atoms in the terminal alkyl group and tertiary alkyl groups; each of R 2 , R 3 and R 4 is the same or different and is selected from the group consisting of ethylene and propylene glycol monoalkyl ether residues containing from 1 to 2 carbon atoms in the terminal alkyl group and tertiary alkyl groups, provided that when R 1 is a propylene glycol monoalkyl ether residue each of R 2 , R 3 and R 4 are also propylene glycol monoalkyl ether residues; the total number of carbon atoms in R 1 , R 2 , R 3 and R 4 being at least 15 and at least one of R 1 , R 2 , R 3 , and R 4 being a glycol monoalkyl ether residue.
Claim 2
Dependent Claim
159 words
An orthosilicate ester having the general formula: ##STR11## wherein R 1 is selected from the group consisting of propylene glycol monoalkyl ether residues containing from 1 to 2 carbon atoms in the terminal alkyl group and tertiary alkyl groups; each of R 2 , R 3 and R 4 is the same or different and is selected from the group consisting of ethylene and propylene glycol monoalkyl ether residues containing from 1 to 2 carbon atoms in the terminal alkyl group and tertiary alkyl groups, provided that when R 1 is a propylene glycol monoalkyl ether residue each of R 2 , R 3 and R 4 are also propylene glycol monoalkyl ether residues; the total number of carbon atoms in R 1 , R 2 , R 3 and R 4 being at least 15 and at least one of R 1 , R 2 , R 3 , and R 4 being a glycol monoalkyl ether residue.
Claim 3
Dependent Claim
70 words
A compound according to claim 1 wherein the at least one glycol monoalkyl ether residue has the formula: ##STR12## wherein each of R 5 and R 6 is selected from the group consisting of a hydrogen atom and a methyl group, provided that R 5 and R 6 are not both methyl groups; R is an alkyl group containing from 1 to 2 carbon atoms; and n is an integer.
Claim 4
Dependent Claim
16 words
A compound according to claim 2 wherein n is an integer of from 2 to 4.
Claim 5
Dependent Claim
30 words
A compound according to claim 1 wherein the total number of carbon atoms in R 1 , R 2 , R 3 and R 4 is from 15 to 60.
Claim 6
Dependent Claim
35 words
A compound according to claim 1 wherein at least one of the groups R 1 , R 2 , R 3 and R 4 is a tertiary alkyl group containing 4 to 8 carbon atoms.
Claim 7
Dependent Claim
123 words
An orthosilicate ester having the general formula: ##STR13## wherein, i. each of R 7 , R 8 , R 9 , and R 10 is the same or different; and ii. each of R 7 , R 8 , R 9 and R 10 is a propylene glycol monoalkyl ether residue of the formula: ##STR14## in which: a. in each adjacent R 5 and R 6 one is a hydrogen atom and the other is a methyl group; b. each n is the same or different and the total value of all integers n is from 8 to 16; and c. each R is the same or different and is selected from the group consisting of a methyl group and an ethyl group.
Claim 8
Dependent Claim
123 words
An orthosilicate ester having the general formula: ##STR13## wherein, i. each of R 7 , R 8 , R 9 , and R 10 is the same or different; and ii. each of R 7 , R 8 , R 9 and R 10 is a propylene glycol monoalkyl ether residue of the formula: ##STR14## in which: a. in each adjacent R 5 and R 6 one is a hydrogen atom and the other is a methyl group; b. each n is the same or different and the total value of all integers n is from 8 to 16; and c. each R is the same or different and is selected from the group consisting of a methyl group and an ethyl group.
Claim 9
Dependent Claim
43 words
A compound according to claim 6 wherein R 7 , R 8 , R 9 and R 10 are the same and each is selected from the group consisting of a tripropylene glycol monomethyl ether residue and a dipropylene glycol monomethyl ether residue.
Claim 10
Dependent Claim
235 words
An orthosilicate ester having the general formula: ##STR15## wherein, i. R 11 is a tertiary alkyl group containing 4 to 8 carbon atoms; ii. R 12 is a glycol monoalkyl ether residue of the formula: ##STR16## ii. R 13 is the same as or different from R 12 and is a glycol monoalkyl ether residue of the formula: ##STR17## iv. R 14 is selected from the group consisting of tertiary alkyl groups containing 4 to 8 carbon atoms, being the same as or different from R 11 , and glycol monoalkyl ether residues of the formula: ##STR18## being the same as either R 12 or R 13 or being different from both R 12 and R 13 ; and v. in glycol monoalkyl ether residues of the formula: ##STR19## a. each R 5 and R 6 is the same or different and both are hydrogen atoms or in each adjacent R 5 and R 6 one is a hydrogen atom and the other is a methyl group; b. each n is the same or different and the total value of all integers n is from 4 to 8 when R 14 is a branched chain alkyl group or from 6 to 12 when R 14 is a glycol monoalkyl ether residue; and c. each R is the same or different and is selected from the group consisting of a methyl group and an ethyl group.
Claim 11
Dependent Claim
235 words
An orthosilicate ester having the general formula: ##STR15## wherein, i. R 11 is a tertiary alkyl group containing 4 to 8 carbon atoms; ii. R 12 is a glycol monoalkyl ether residue of the formula: ##STR16## ii. R 13 is the same as or different from R 12 and is a glycol monoalkyl ether residue of the formula: ##STR17## iv. R 14 is selected from the group consisting of tertiary alkyl groups containing 4 to 8 carbon atoms, being the same as or different from R 11 , and glycol monoalkyl ether residues of the formula: ##STR18## being the same as either R 12 or R 13 or being different from both R 12 and R 13 ; and v. in glycol monoalkyl ether residues of the formula: ##STR19## a. each R 5 and R 6 is the same or different and both are hydrogen atoms or in each adjacent R 5 and R 6 one is a hydrogen atom and the other is a methyl group; b. each n is the same or different and the total value of all integers n is from 4 to 8 when R 14 is a branched chain alkyl group or from 6 to 12 when R 14 is a glycol monoalkyl ether residue; and c. each R is the same or different and is selected from the group consisting of a methyl group and an ethyl group.
Claim 12
Dependent Claim
179 words
A compound according to claim 8 wherein R 11 is a t-butyl group and R 12 , R 13 and R 14 are triethylene glycol monomethyl ether residues; R 11 is a neopentyl group and R 12 , R 13 and R 14 are tripropylene glycol monomethyl ether residues; R 11 and R 14 are t-butyl groups and R 12 and R 13 are dipropylene glycol monomethyl ether residues; R 11 and R 14 are t-butyl groups, R 12 is a dipropylene glycol monomethyl ether residue and R 13 is a triethylene glycol monomethyl ether residue; R 11 is a t-butyl group and R 12 , R 13 and R 14 are dipropylene glycol monomethyl ether residues; R 11 and R 14 are t-butyl groups and R 12 and R 13 are triethylene glycol monomethyl ether residues; R 11 and R 14 are t-butyl groups and R 12 and R 13 are tripropylene glycol monomethyl ether residues; or R 11 is a t-butyl group and R 12 , R 13 and R.sup. 14 are tripropylene glycol monomethyl ether residues.
Claim 13
Dependent Claim
26 words
A process comprising reacting a silicon tetrahalide or transesterifying a tetra (hydrocarbyl) silicate with a hydroxy compound to form a compound as defined in claim 1.
Claim 14
Dependent Claim
13 words
A hydraulic fluid containing at least one compound as defined in claim 1.
Claim 15
Dependent Claim
17 words
A hydraulic fluid according to claim 11 containing from 1 to 99% by weight of the compound.
Claim 16
Dependent Claim
18 words
A hydraulic fluid according to claim 11 containing at least one conventional hydraulic fluid additive and/or base stock.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |