US4333843A
Expired / Lapsed
US
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Glycol compositions containing a hydrolyzate of an organo phosphorus-silicon compound
Assignee: Dow Chemical Co
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Filing: 1980-10-20
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Granted: 1982-06-08
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Expires: 2000-10-20
Abstract
Abstract Gellation resistant aqueous glycol compositions useful as antifreeze compositions are disclosed containing silicates together with other corrosion inhibitors. The silicates are added to the glycol compositions after the other additives have been added and after the composition has been adjusted to a pH range of 7-12. The gellation resistance is obtained or enhanced by the addition of an effective amount of the hydrolyzate of organo-phosphorous-silicon compounds having the formula (RO).sub.3 Si(CH.sub.2).sub.n --O-P(O)(CH.sub.3)--OR wherein R is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4, A method of improving the gellation resistance of aqueous glycol compositions is also disclosed which comprises adding an effective amount of the above hydrolyzate to the corrosion resistant glycol compositions before or during the silicate addition.
Inventors
- 👤 Phillip L. Wing
- 👤 George A. Sweeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:18
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
91 words
A gellation resistant aqueous glycol composition comprising (A) 85 to 98 percent by weight of an alkylene glycol, an alkylene glycol ether, or mixtures thereof, (B) an effective amount to reduce corrosion of an alkali metal silicate, (C) an effective amount to improve gellation resistance of the hydrolyzate of organophosphorus-silicon compounds having the formula (RO).sub.3 Si(CH.sub.2).sub.n --O--P(O)(CH.sub.3)--OR wherein r is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4, and (D) the remainder being water, and an effective amount of one or more other corrosion inhibitors.
Claim 2
Dependent Claim
91 words
A gellation resistant aqueous glycol composition comprising (A) 85 to 98 percent by weight of an alkylene glycol, an alkylene glycol ether, or mixtures thereof, (B) an effective amount to reduce corrosion of an alkali metal silicate, (C) an effective amount to improve gellation resistance of the hydrolyzate of organophosphorus-silicon compounds having the formula (RO).sub.3 Si(CH.sub.2).sub.n --O--P(O)(CH.sub.3)--OR wherein r is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4, and (D) the remainder being water, and an effective amount of one or more other corrosion inhibitors.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the alkylene glycol is ethylene glycol.
Claim 4
Dependent Claim
17 words
The composition of claim 1 wherein the alkylene glycol ether is the monomethyl ether of propylene glycol.
Claim 5
Dependent Claim
15 words
The composition of claim 1 wherein R is a methyl group and n is 3.
Claim 6
Dependent Claim
85 words
A gellation resistant aqueous glycol composition comprising (A) 85 to 98 percent by weight of an alkylene glycol, (B) an effective amount to reduce corrosion of an alkali metal borate, (C) an effective amount to reduce corrosion of an alkali metal silicate, (D) an effective amount to improve gellation resistance of the hydrolyzate of organophosphorous-silicon compounds having the formula (RO).sub.3 Si(CH.sub.2).sub.n --O--P(O)(CH.sub.3)--OR wherein R is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4, and (D) the remainder being water.
Claim 7
Dependent Claim
85 words
A gellation resistant aqueous glycol composition comprising (A) 85 to 98 percent by weight of an alkylene glycol, (B) an effective amount to reduce corrosion of an alkali metal borate, (C) an effective amount to reduce corrosion of an alkali metal silicate, (D) an effective amount to improve gellation resistance of the hydrolyzate of organophosphorous-silicon compounds having the formula (RO).sub.3 Si(CH.sub.2).sub.n --O--P(O)(CH.sub.3)--OR wherein R is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4, and (D) the remainder being water.
Claim 8
Dependent Claim
12 words
The composition of claim 1 wherein the alkylene glycol is ethylene glycol.
Claim 9
Dependent Claim
15 words
The composition of claim 1 wherein R is a methyl group and n is 3.
Claim 10
Dependent Claim
87 words
A corrosion and gellation resistant aqueous glycol composition comprising (A) 85 to 98 percent by weight of an alkylene glycol, (B) 0.5 to 2.0 percent by weight of an alkali metal borate (C) 0.025 to 1.0 percent by weight of of an alkali metal silicate, (D) 0.001 to 0.5 percent by weight of the hydrolyzate of organophosphorous-silicon compounds having the formula (RO).sub.3 Si(CH.sub.2).sub.n --O--P(O)(CH.sub.3)--OR wherein R is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4, and (D) the remainder being water.
Claim 11
Dependent Claim
87 words
A corrosion and gellation resistant aqueous glycol composition comprising (A) 85 to 98 percent by weight of an alkylene glycol, (B) 0.5 to 2.0 percent by weight of an alkali metal borate (C) 0.025 to 1.0 percent by weight of of an alkali metal silicate, (D) 0.001 to 0.5 percent by weight of the hydrolyzate of organophosphorous-silicon compounds having the formula (RO).sub.3 Si(CH.sub.2).sub.n --O--P(O)(CH.sub.3)--OR wherein R is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4, and (D) the remainder being water.
Claim 12
Dependent Claim
19 words
The composition of claim 8 wherein the amount of said hydrolyzate used is 0.005 to 0.1 percent by weight.
Claim 13
Dependent Claim
19 words
The composition of claim 8 wherein the amount of said hydrolyzate used is 0.01 to 0.05 percent by weight.
Claim 14
Dependent Claim
15 words
The composition of claim 8 wherein R is a methyl group and n is 3.
Claim 15
Dependent Claim
12 words
The composition of claim 2 wherein the alkylene glycol is ethylene glycol.
Claim 16
Independent Claim
71 words
A method for making a gellation resistant aqueous glycol composition containing alkali metal silicates, and other corrosion inhibitors which comprises adding to the glycol compositions before or during the addition of the alkali metal silicates an effective amount to improve gellation resistance of the hydrolyzate of organophosphorous-silicon compounds having the formula (RO).sub.3 Si(CH.sub.2).sub.n --O--P(O)(CH.sub.3)--OR wherein R is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4.
Claim 17
Independent Claim
71 words
A method for making a gellation resistant aqueous glycol composition containing alkali metal silicates, and other corrosion inhibitors which comprises adding to the glycol compositions before or during the addition of the alkali metal silicates an effective amount to improve gellation resistance of the hydrolyzate of organophosphorous-silicon compounds having the formula (RO).sub.3 Si(CH.sub.2).sub.n --O--P(O)(CH.sub.3)--OR wherein R is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4.
Claim 18
Dependent Claim
18 words
The method as set forth in claim 13 wherein R is a methyl group and n is 3.
Claim 19
Dependent Claim
15 words
The method as set forth in claim 13 wherein the alkylene glycol is ethylene glycol.
Claim 20
Dependent Claim
9 words
The product produced by the method of claim 13.
Claim 21
Dependent Claim
9 words
The product produced by the method of claim 14.
Claim 22
Dependent Claim
9 words
The product produced by the method of claim 15.
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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |