US4772408A
Expired / Lapsed
US
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Silicate-containing antifreeze with phosphonate silane stabilizer
Assignee: Prestone Products Corp USA
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Filing: 1987-05-06
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Granted: 1988-09-20
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Expires: 2007-05-06
Abstract
Abstract A silicone/silicate containing antifreeze characterized by dilute aqueous stability includes phosphonate silanes characterized by the following formula: ##STR1## wherein a is 0 or 1, b is 1 or 2, c is 0 or 1, R 1 and R 3 are selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, R 2 is a divalent hydrocarbon radical selected from the group consisting of alkylene, arylene and alicyclic radicals, Z is a hydrolyzable moeity attached to silicon, and X is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, substituted monovalent hydrocarbon radicals, and a monovalent cation, the phosphonate silane having an appropriate hydrophile/hydrophobe balance and being present in an amount sufficient to stabilize the silicate.
Inventors
- 👤 Paul H. Mohr
- 👤 Enrico J. Pepe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:13
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
176 words
An antifreeze having a selected pH comprising: (a) an alcohol; (b) a buffer in an amount to maintain said pH for the antifreeze; (c) a silicate in a corrosion-inhibiting amount; and (d) a phosphonate silane having the formula: ##STR38## wherein a is 0 or 1, b is 1 or 2, c is 0 or 1, R 1 and R 3 are selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals and selected so as not to render the silane, its hydrolyzate or the copolymer of the phosphonate silane and silicate insoluble in the antifreeze, R 2 is a divalent hydrocarbon radical selected from the group consisting of alkylene having from 1 to about 36 carbon atoms, arylene and alicyclic radicals, Z is a hydrolyzable moiety attached to silicon, and X is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, substituted monovalent hydrocarbon radicals, and a monovalent cation, said phosphonate silane having an appropriate hydrophile/hydrophobe balance and being present in an amount sufficient to stabilize the silicate.
Claim 2
Dependent Claim
176 words
An antifreeze having a selected pH comprising: (a) an alcohol; (b) a buffer in an amount to maintain said pH for the antifreeze; (c) a silicate in a corrosion-inhibiting amount; and (d) a phosphonate silane having the formula: ##STR38## wherein a is 0 or 1, b is 1 or 2, c is 0 or 1, R 1 and R 3 are selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals and selected so as not to render the silane, its hydrolyzate or the copolymer of the phosphonate silane and silicate insoluble in the antifreeze, R 2 is a divalent hydrocarbon radical selected from the group consisting of alkylene having from 1 to about 36 carbon atoms, arylene and alicyclic radicals, Z is a hydrolyzable moiety attached to silicon, and X is a member selected from the group consisting of hydrogen, monovalent hydrocarbon radicals, substituted monovalent hydrocarbon radicals, and a monovalent cation, said phosphonate silane having an appropriate hydrophile/hydrophobe balance and being present in an amount sufficient to stabilize the silicate.
Claim 3
Dependent Claim
13 words
The antifreeze of claim 1 wherein b is 1 and c is 0.
Claim 4
Dependent Claim
14 words
The antifreeze of claim 2 wherein R 2 is (CH 2 ) 2 .
Claim 5
Dependent Claim
14 words
The antifreeze of claim 2 wherein R 2 is (CH 2 ) 3 .
Claim 6
Dependent Claim
90 words
The antifreeze of claim 1 wherein component (c) is an inorganic silicate described as a distribution of species represented by units having the empirical formula: ##STR39## wherein M is a monovalent cation that forms a glycol soluble silicate selected from the group consisting of sodium, potassium, lithium, rubidium and tetraorganoammonium cations, w has a value of from 1 to 4 inclusive, v has a value from 0 to 3 inclusive and p has a value from 1 to 4 inclusive which is equal to the sum of w and v.
Claim 7
Dependent Claim
33 words
The antifreeze of claim 1 wherein component (c) is an organic silicate ester having the formula: Si(OR).sub.4 wherein R is selected from the group consisting of alkyl, aryl, alkoxyalkyl, alkoxyaryl and mixtures thereof.
Claim 8
Dependent Claim
38 words
The antifreeze of any of claims 1 through 6 made from an antifreeze concentrate wherein the amount of component (c) is between 100 and 1000 ppm of equivalent Si based on the total weight of the antifreeze concentrate.
Claim 9
Dependent Claim
38 words
The antifreeze of any of claims 1 through 6 made from a concentrate wherein the amount of component (d) is between about 10 and about 100 ppm of silicon equivalents based on the weight of the antifreeze concentrate.
Claim 10
Dependent Claim
19 words
The antifreeze of any of claims 1 through 6 wherein said pH is between about 8 and about 11.
Claim 11
Dependent Claim
19 words
The antifreeze of any of claims 1 through 6 wherein said pH is between about 9 and about 10.5.
Claim 12
Dependent Claim
19 words
The antifreeze of any of claims 1 through 6 wherein said pH is between about 8 and about 10.5.
Claim 13
Dependent Claim
19 words
The antifreeze of any of claims 1 through 6 which additionally contains carbonate or bicarbonate, or a mixture thereof.
Claim 14
Dependent Claim
34 words
The antifreeze of any of claims 1 through 6 made from a concentrate wherein the amount of component (b) is between about 1 and about 5 wt.% based on the weight of the concentrate.
Claim 15
Dependent Claim
22 words
The antifreeze of claim 1 wherein said phosphonate silane comprises the reaction product of diethyl phosphite and vinyltriethoxysilane, saponified with potassium hydroxide.
Claim 16
Dependent Claim
18 words
The antifreeze of claim 1 wherein said phosphonate silane is added to the antifreeze in a glycolized form.
Claim 17
Dependent Claim
176 words
An antifreeze having a selected pH comprising: (a) an alcohol; (b) a buffer in an amount to maintain said selected pH for the antifreeze; (c) a silicate in a corrosion-inhibiting amount; and (d) a phosphonate silane having the formula: ##STR40## wherein a is 0 or 1, b is 1 or 2, c is 0 or 1, R 1 and R 3 are selected from the group consisting of hydrogen, monovalent monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals and selected so as not to render the silane, its hydrolyzate or the copolymer of the silane/silicate insoluble in the antifreeze, R 2 is a divalent alkylene radical haivng 2 or 3 carbons, Z is a hydrolyzable moiety attached to silicon, and X is a member selected fron the group consisting of hydrogen, monovalent hydrocarbon radicals, substituted monovalent hydrocarbon radicals, and a monovalent cation, said phosphonate silane having an appropriate hydrophile/hydrophobe balance characterized by less than about 100 mg. precipitate as determined by the boiling beaker test, and being present in an amount sufficient to stabilize the silicate.
Claim 18
Dependent Claim
176 words
An antifreeze having a selected pH comprising: (a) an alcohol; (b) a buffer in an amount to maintain said selected pH for the antifreeze; (c) a silicate in a corrosion-inhibiting amount; and (d) a phosphonate silane having the formula: ##STR40## wherein a is 0 or 1, b is 1 or 2, c is 0 or 1, R 1 and R 3 are selected from the group consisting of hydrogen, monovalent monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals and selected so as not to render the silane, its hydrolyzate or the copolymer of the silane/silicate insoluble in the antifreeze, R 2 is a divalent alkylene radical haivng 2 or 3 carbons, Z is a hydrolyzable moiety attached to silicon, and X is a member selected fron the group consisting of hydrogen, monovalent hydrocarbon radicals, substituted monovalent hydrocarbon radicals, and a monovalent cation, said phosphonate silane having an appropriate hydrophile/hydrophobe balance characterized by less than about 100 mg. precipitate as determined by the boiling beaker test, and being present in an amount sufficient to stabilize the silicate.
Claim 19
Dependent Claim
19 words
The antifreeze of claim 16 wherein the precipitate in the boiling beaker test is less than about 60 mg.
Claim 20
Dependent Claim
19 words
The antifreeze of claim 17 wherein the precipitate in the boiling beaker test is less than about 10 mg.
Claim 21
Dependent Claim
14 words
The antifreeze of claim 16 wherein R 2 is (CH 2 ) 2 .
Claim 22
Dependent Claim
14 words
The antifreeze of claim 16 wherein R 2 is (CH 2 ) 3 .
Claim 23
Dependent Claim
89 words
The antifreeze of claim 16 wherein component (c) is an inorganic silicate described as a distribution of species represented by units having the empirocal formula: wherein M is a monovalent cation that forms a glycol soluble silicate selected from the group consisting of sodium, potassium, lithium, rubidium and tetraorganoammonoium cations, w has a value of from 1 to 4 inclusive, v has a value from 0 to 3 inclusive and p has a value from 1 to 4 inclusive which is equal to the sum of w and v.
Claim 24
Dependent Claim
33 words
The antifreeze of claim 16 wherein component (c) is an organic silicate ester having the formula: Si(OR).sub.4 wherein R is selected from the group consisting of alkyl, aryl, alkoxyalkyl, alkoxyaryl and mixtures thereof.
Claim 25
Dependent Claim
34 words
The antifreeze of claim 16 made from an antifreeze concentrate wherein the amount of component (c) is between 100 and 1000 ppm of euqivalent Si based on the total weight of the antifreeze concentrate.
Claim 26
Dependent Claim
35 words
The antifreeze of claim 16 made from an antifreeze concentrate wherein the amount of component (d) is between about 10 and about 100 ppm of silicon equivalents based on the weight of the antifreeze concentrate.
Claim 27
Dependent Claim
16 words
The antifreeze of claim 16 wherein said selected pH is between about 8 and about 11.
Claim 28
Dependent Claim
16 words
The antifreeze of claim 25 wherein said selected pH is between about 9 and about 0.5.
Claim 29
Dependent Claim
28 words
The antifreeze of claim 6 wherein said selected pH is between about 9 and about 10.5 as measured on a 50:50 volume/volume ratio of antifreeze concentrate and water.
Claim 30
Dependent Claim
15 words
The antifreeze of claim 16 which additionally contains carbonate or bicarbonate, or a mixture thereof.
Claim 31
Dependent Claim
27 words
The antifreeze of claim 16 wherein the amount of component (b) is between about 1 and about 5 wt. % based on the weight of the concentrate.
Claim 32
Dependent Claim
22 words
The antifreeze of claim 16 wherein said phosphonate silane comprises the reaction product of diethyl phosphite and vinyltriethoxysilane, saponified with potassium hydroxide.
Claim 33
Dependent Claim
27 words
The antifreeze of claim 16 wherein said phosphonate silane is added to the antifreeze in a glycolized form wherein the phosphonate silane is transesterfied with a glycol.
Claim 34
Dependent Claim
11 words
The antifreeze of claim 31 wherein the glycol is ethylene glycol.
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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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |