US4783274A
Expired / Lapsed
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Hydraulic fluids
Assignee: Kasvioljy-Vaxtolje Oy AB
•
Filing: 1987-01-28
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Granted: 1988-11-08
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Expires: 2007-01-28
Abstract
Abstract The invention is concerned with an anhydrous oily lubricant, which is based on vegetable oils, which is substituted for mineral lubricant oils, and which, as its main component, contains triglycerides that are esters of saturated and/or unsaturated straight-chained C 10 to C 22 fatty acids and glycerol. The lubricant is characterized in that it contains at least 70 percent by weight of a triglyceride whose iodine number is at least 50 and no more than 125 and whose viscosity index is at least 190. As its basic component, instead of or along with the said triglyceride, the lubricant oil may also contain a polymer prepared by hot-polymerization out of the said triglyceride or out of a corresponding triglyceride. As additives, the lubricant oil may contain solvents, fatty-acid derivatives, in particular their metal salts, organic or inorganic, natural or synthetic polymers, and customary additives for lubricants.
Inventors
- 👤 Kari V. J. Jokinen
- 👤 Heikki K. Kerkkonen
- 👤 Eero A. Leppamaki
- 👤 Eino I. Piirila
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:54
CPC Classifications
C; C10; C10M; C10M101/00; C10M101/04; C10M109/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
118 words
A basic hydraulic fluid composition consisting of: 85to 99 percent by weight of at least one natural triglyceride which is an ester of a straight-chain C 10 to C 22 fatty acid and glycerol, which triglyceride has an iodine number of at least 50 and not more than 128, the balance being selected from at least two of the following groups: Group 1: Hindered phenolics, aromatic amines, selected from the group consisting of 2,6-di-tert-butyl-4-methyl phenol; 2'2-methylenebis(4-methyl-6-tert-butylphenol); N,N'di-sec-butyl-p-phenylene-diamine; alkylated diphenyl amine; alkylated phenyl-alfa-napthylamine Group 2: Metal salts of dithioacids, phosphites, sulfides, selected from the group consisting of zinc dialkyldithiophosphates; tris(noylphenyl)phosphite; dilauryl thiodipropionate Group 3: Amides, non aromatic amines, hydrazines, triazols, selected from the group consisting of N,N'-diethyl-N,N'-diphenyloxamide; N,N'-disalicylidene-1,2-propenylenediamine; N,N'-bis(beta-3,5-ditertbutyl-4-hydroxyphenyl-propiono)hydrazide.
Claim 2
Dependent Claim
118 words
A basic hydraulic fluid composition consisting of: 85to 99 percent by weight of at least one natural triglyceride which is an ester of a straight-chain C 10 to C 22 fatty acid and glycerol, which triglyceride has an iodine number of at least 50 and not more than 128, the balance being selected from at least two of the following groups: Group 1: Hindered phenolics, aromatic amines, selected from the group consisting of 2,6-di-tert-butyl-4-methyl phenol; 2'2-methylenebis(4-methyl-6-tert-butylphenol); N,N'di-sec-butyl-p-phenylene-diamine; alkylated diphenyl amine; alkylated phenyl-alfa-napthylamine Group 2: Metal salts of dithioacids, phosphites, sulfides, selected from the group consisting of zinc dialkyldithiophosphates; tris(noylphenyl)phosphite; dilauryl thiodipropionate Group 3: Amides, non aromatic amines, hydrazines, triazols, selected from the group consisting of N,N'-diethyl-N,N'-diphenyloxamide; N,N'-disalicylidene-1,2-propenylenediamine; N,N'-bis(beta-3,5-ditertbutyl-4-hydroxyphenyl-propiono)hydrazide.
Claim 3
Dependent Claim
40 words
A base hydraulic fluid composition according to the claim 1 wherein the triglyceride is of oleic-acid-linoleic-acid type and contains saturated fatty acids of not more than 20 percent by weight calculated on the quantity of fatty acid esterified with glycerol.
Claim 4
Dependent Claim
20 words
A base hydraulic fluid composition according to the claim 1 or 2, wherein the triglyceride consists of rape seed oil.
Claim 5
Dependent Claim
35 words
A hydraulic fluid having the following composition: ______________________________________
Refined rapeseed oil,
96.5 percent by weight
Zn--dialkyldithiophosphate
1.5 percent by weight
(Anglamol ® 75),
Tertiary-butyl phenol deri-
2.0 percent by weight
vative (Hitec ® 4735),
______________________________________
Claim 6
Dependent Claim
35 words
A hydraulic fluid having the following composition: ______________________________________
Refined rapeseed oil,
96.5 percent by weight
Zn--dialkyldithiophosphate
1.5 percent by weight
(Anglamol ® 75),
Tertiary-butyl phenol deri-
2.0 percent by weight
vative (Hitec ® 4735),
______________________________________
Claim 7
Dependent Claim
50 words
A hydraulic fluid having the following composition: ______________________________________
Refined rapeseed oil,
98.9 percent by weight
Amino phosphate derivative
0.5 percent by weight
(Irgalube ® 349),
2,6-di-tert.-butyl-4-
0.5 percent by weight
methylphenol (Additin ® 10),
Triazole derivative
0.05 percent by weight
(Reomet ® 39),
N--acyl-sarcosine 0.05 2
(Sarkosyl ® O)
______________________________________
Claim 8
Dependent Claim
50 words
A hydraulic fluid having the following composition: ______________________________________
Refined rapeseed oil,
98.9 percent by weight
Amino phosphate derivative
0.5 percent by weight
(Irgalube ® 349),
2,6-di-tert.-butyl-4-
0.5 percent by weight
methylphenol (Additin ® 10),
Triazole derivative
0.05 percent by weight
(Reomet ® 39),
N--acyl-sarcosine 0.05 2
(Sarkosyl ® O)
______________________________________
Claim 9
Dependent Claim
34 words
A hydraulic fluid based on the composition defined in claim 1, wherein the fluid in addition contains at least one: demulsifier, selected from the group consisting of: heavy metal soaps; Ca dn Mg sulphonates.
Claim 10
Dependent Claim
54 words
A hydraulic fluid based on the composition defined in claim 1, wherein the fluid in addition contains at least one: boundary lubrication additive, selected from the group consisting of: metal dialkyl dithiophosphates; metal diaryl dithiophosphates; metal dialkyl dithocarbamates; alkyl phosphates; phosphorized fats and olefins; sulfurized fats and fat derivatives chlorinated fats and fat derivatives.
Claim 11
Dependent Claim
37 words
A hydraulic fluid based on the composition defined in claim 1, wherein the fluid in addition contains at least one: corrosion inhibitor, selected from the group consisting of: metal sulfonates; acid phosphate esters; amines; alkyl succinic acids.
Claim 12
Dependent Claim
33 words
A hydraulic fluid based on the composition defined in claim 1, wherein the fluid in addition contains at least one: VI improver, selected from the group consisting of: polymethacrylates; styrene butadiene copolymers; polyisobutylenes.
Claim 13
Dependent Claim
35 words
A hydraulic fluid based on the composition defined in claim 1, wherein the fluid in addition contains at least one: pour point depressant, selected from the group consisting of: chlorinated polymers; alkylated phenol polymers; polymethacrylates.
Claim 14
Dependent Claim
30 words
A hydraulic fluid based on the composition defined in claim 1, wherein the fluid in addition contains at least one: foam decomposer, selected from the group consisting of: polysiloxanes; polyacrylates.
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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |