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US5087717A
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Organosilane stabilizers for inorganic silicates in antifreezer/coolant compositions
Assignee: Korea Advanced Institute of Science and Technology
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Filing: 1990-09-10
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Granted: 1992-02-11
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Expires: 2010-09-10
Abstract
Abstract Organotrialkoxysilane stabilizers for inorganic silicate corrosion inhibitor additives in antifreezer/coolant formulations are described. The stabilizers have the following structure; <IMAGE> wherein R is an alkyl group of 1-4 carbon atoms, R1 is either <IMAGE> and R2 may be selected from <IMAGE> and R3 is phenyl or <IMAGE> These stabilizers help prevent the gelling of the corrosion inhibiting silicate additives in antifreezer/coolant formulations thereby increasing the useful lifetime of such formulations.
Inventors
- 👤 Il Nam Jung
- 👤 Sang Yo Hwang
- 👤 Hae Kyung Bae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:23
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/182
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A stabilizer of inorganic silicates in antifreeze/coolant formulations having the formula ##STR32## wherein R is an alkyl group of 1-4 carbon atoms, R 1 is a member selected from the group consisting of ##STR33## and R 2 is a member selected from the group consisting of --CN and ##STR34## and R 3 is a member selected from the group consisting of phenyl and ##STR35##
Claim 2
Dependent Claim
64 words
A stabilizer of inorganic silicates in antifreeze/coolant formulations having the formula ##STR32## wherein R is an alkyl group of 1-4 carbon atoms, R 1 is a member selected from the group consisting of ##STR33## and R 2 is a member selected from the group consisting of --CN and ##STR34## and R 3 is a member selected from the group consisting of phenyl and ##STR35##
Claim 3
Dependent Claim
100 words
A process for the preparation of an organosilane of the formula: ##STR36## wherein R is an alkyl group of 1-4 carbon atoms, R 1 is selected from the group consisting of ##STR37## and R 2 is --CN or ##STR38## and R 3 is phenyl or ##STR39## which comprises reacting glycidoxypropyltrialkoxysilane or beta-(3,4-epoxycyclohexyl) ethyltrimethoxysilane with an organic compound of the formula X--CH.sub.2 --Y in the presence of a base catalyst at a temperature ranging between about 25° C. and about 200° C., and wherein X and Y are identical or different and selected from the group consisting of ##STR40## and ##STR41##
Claim 4
Dependent Claim
100 words
A process for the preparation of an organosilane of the formula: ##STR36## wherein R is an alkyl group of 1-4 carbon atoms, R 1 is selected from the group consisting of ##STR37## and R 2 is --CN or ##STR38## and R 3 is phenyl or ##STR39## which comprises reacting glycidoxypropyltrialkoxysilane or beta-(3,4-epoxycyclohexyl) ethyltrimethoxysilane with an organic compound of the formula X--CH.sub.2 --Y in the presence of a base catalyst at a temperature ranging between about 25° C. and about 200° C., and wherein X and Y are identical or different and selected from the group consisting of ##STR40## and ##STR41##
Claim 5
Dependent Claim
49 words
The process of claim 2 wherein said base catalyst is a member selected from the group consisting of RLi, RMgX, M 1 OR, sodium hydride and phenylltihium wherein R is an alkyl group of 1-4 carbon atoms, X is chlorine or bromine and M 1 is sodium or potassium.
Claim 6
Dependent Claim
21 words
The process as claimed in claim 3, wherein said RLi is selected from the group consisting of methyllithium, n-butyl-lithium and t-butyllithium.
Claim 7
Dependent Claim
24 words
The process as claimed in claim 3, wherein said RMgX is selected from the group consisting of methyl magnesium chloride and methyl magnesium bromide.
Claim 8
Dependent Claim
12 words
The process of claim 3 wherein M 1 OR is sodium methoxide.
References Cited (Backward Citations)
US4005024A
Cited
US4965385A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |