US4234497A
Expired / Lapsed
US
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Iso-palmitate polyol ester lubricants
Assignee: Standard Lubricants Inc
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Filing: 1979-04-30
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Granted: 1980-11-18
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Expires: 1999-04-30
Abstract
Abstract A polyol ester, useful as a base stock in synthetic lubricants, comprising the reaction product of: (a) one or more aliphatic polyhydric alcohols containing from 2 to 8 primary hydroxyl groups; (b) a minor amount of iso-palmitic acid; and (c) one or more monocarboxylic acids having from 5 to 11 carbon atoms. These esters exhibit unusually good low temperature, viscosity and seal swell properties. Engine oil additive compatibility is excellent.
Inventors
- 👤 Milton L. Honig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:45
CPC Classifications
C; C10; C10M; C10M105/00; C10M105/08; C10M105/32; C10M105/38; C10M2207/00; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/109
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
An iso-palmitate polyol ester lubricant base stock, comprising the reaction product of: (a) one or more aliphatic polyhydric alcohols containing from 2 to 8 primary hydroxyl groups; (b) a minor amount of iso-palmitic acid; ##STR5## (c) one or more monocarboxylic acids, having the formula: R.sup.3 CO.sub.2 H, wherein R 3 is C 4 -C 6 hydrocarbyl or CH 3 (CH 2 ) 3 CH(C 2 H 5 ); and wherein the iso-palmitic acid concentration varies from about 5 to about 20 molar percent of the components (b)+(c).
Claim 2
Dependent Claim
87 words
An iso-palmitate polyol ester lubricant base stock, comprising the reaction product of: (a) one or more aliphatic polyhydric alcohols containing from 2 to 8 primary hydroxyl groups; (b) a minor amount of iso-palmitic acid; ##STR5## (c) one or more monocarboxylic acids, having the formula: R.sup.3 CO.sub.2 H, wherein R 3 is C 4 -C 6 hydrocarbyl or CH 3 (CH 2 ) 3 CH(C 2 H 5 ); and wherein the iso-palmitic acid concentration varies from about 5 to about 20 molar percent of the components (b)+(c).
Claim 3
Dependent Claim
54 words
The ester of claim 1, wherein component (a) is a neopentyl polyhydric alcohol represented by the formula: ##STR6## wherein R 1 and R 2 are each independently selected from the group consisting of CH 3 , C 2 H 5 , CH 2 OH and CH 2 OCH 2 C(CH 2 OH) 3 .
Claim 4
Dependent Claim
23 words
The ester of claim 2, wherein the neopentyl polyhydric alcohol (a) is selected from the group consisting of trimethylol propane, pentaerythritol, and dipentaerythritol.
Claim 5
Dependent Claim
25 words
The ester of claim 1, where the monocarboxylic acid (c) is selected from the group consisting of heptanoic acid, valeric acid, and 2-ethyl hexanoic acid.
Claim 6
Dependent Claim
14 words
The ester of claim 2, wherein the neopentyl polyhydric alcohol is substantially completely esterified.
Claim 7
Independent Claim
148 words
A method for preparing an iso-palmitate polyol ester lubricant base stock comprising, reacting (a) one or more aliphatic polyhydric alcohols containing from 2 to 8 primary hydroxyl groups; (b) a minor amount of iso-palmitic acid; ##STR7## (c) one or more monocarboxylic acids, having the formula: R.sup.3 CO.sub.2 H, wherein R 3 is C 4 -C 6 hydrocarbyl or CH 3 (CH 2 ) 3 CH(C 2 H 5 ); and wherein the iso-palmitic acid concentration varies from about 5 to about 20 molar percent of the components (b)+(c); in liquid phase, in the presence of a catalyst selected from the group consisting of organo tin and organo titanium compounds having at least one organic group attached to the metal atom, selected from the group consisting of alkoxy, alkyl, dialkyl, amino aryloxy, and alkylaryloxy; at a temperature varying from 100°-300° C. under azeotropic conditions, and vacuum stripping the product.
Claim 8
Independent Claim
148 words
A method for preparing an iso-palmitate polyol ester lubricant base stock comprising, reacting (a) one or more aliphatic polyhydric alcohols containing from 2 to 8 primary hydroxyl groups; (b) a minor amount of iso-palmitic acid; ##STR7## (c) one or more monocarboxylic acids, having the formula: R.sup.3 CO.sub.2 H, wherein R 3 is C 4 -C 6 hydrocarbyl or CH 3 (CH 2 ) 3 CH(C 2 H 5 ); and wherein the iso-palmitic acid concentration varies from about 5 to about 20 molar percent of the components (b)+(c); in liquid phase, in the presence of a catalyst selected from the group consisting of organo tin and organo titanium compounds having at least one organic group attached to the metal atom, selected from the group consisting of alkoxy, alkyl, dialkyl, amino aryloxy, and alkylaryloxy; at a temperature varying from 100°-300° C. under azeotropic conditions, and vacuum stripping the product.
Claim 9
Dependent Claim
20 words
The method of claim 6, wherein the catalyst is selected from the group consisting of tetra-n-butyl titanate and stannous octoate.
Claim 10
Dependent Claim
14 words
The ester of claim 4, wherein the monocarboxylic acid (c) is 2-ethyl hexanoic acid.
Claim 11
Dependent Claim
25 words
The method of claim 6, wherein the monocarboxylic acid (c) is selected from the group consisting of heptanoic acid, valeric acid, and 2-ethyl hexanoic acid.
Claim 12
Dependent Claim
13 words
The method of claim 9, wherein the monocarboxylic acid is 2-ethyl heptanoic acid.
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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) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |