US4260504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxyalkylene triol additives for minimizing deposits from aqueous heat-exchanging fluids
Assignee: BP Chimie SA
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Filing: 1979-03-22
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Granted: 1981-04-07
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Expires: 1999-03-22
Abstract
Abstract PCT No. PCT/FR78/00008 Sec. 371 Date Mar. 22, 1979 Sec. 102(e) Date Mar. 22, 1979 PCT Filed July 10, 1978 The invention concerns a process for preventing the formation of deposits on the walls of the heating or cooling circuits of heat exchangers in which an aqueous heat-exchange liquid circulates. This process comprises mixing with the heat-exchange liquids from about 0.3 to about 5% by weight of a product of polyaddition of ethylene oxide and propylene oxide on a monohydric alcohol, water, a diol or a triol, the ethylene oxide representing from 60% to 90% by weight of the fixed alkylene oxides. This process can be used in particular in internal combustion engine cooling circuits.
Inventors
- 👤 Marcel J. Tucoulat
- 👤 Jacques Lonchampt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:29
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C09; C09K; C09K5/00; C09K5/20; C23; C23F; C23F14/00; C23F14/02; C23F15/00; C23F15/005; F; F01; F01P; F01P11/00; F01P11/06; C02F2103/00; C02F2103/02; C02F2103/023; F01P3/00; F01P2003/001; F01P2011/063; F28; F28F; F28F19/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A process for preventing the formation of deposits on the walls of the heating or cooling circuits of heat exchangers using an aqueous heat-exchange liquid containing an anti-freeze based on a glycol, said process being characterised in that addition is made to the heat-exchange liquid of from about 0.3 to about 5% by weight of a product of polyaddition of ethylene oxide and propylene oxide on a triol, the ethylene oxide representing from 60% to 90% by weight of the fixed alkylene oxides, the mean molecular weight of the product of polyaddition of ethylene oxide and propylene oxide on a triol being from 500 to 4,000.
Claim 2
Dependent Claim
106 words
A process for preventing the formation of deposits on the walls of the heating or cooling circuits of heat exchangers using an aqueous heat-exchange liquid containing an anti-freeze based on a glycol, said process being characterised in that addition is made to the heat-exchange liquid of from about 0.3 to about 5% by weight of a product of polyaddition of ethylene oxide and propylene oxide on a triol, the ethylene oxide representing from 60% to 90% by weight of the fixed alkylene oxides, the mean molecular weight of the product of polyaddition of ethylene oxide and propylene oxide on a triol being from 500 to 4,000.
Claim 3
Dependent Claim
30 words
A process as claimed in 1 wherein the ethylene oxide and propylene oxide polyaddition product is produced by reaction of a mixture of said two alkylene oxides on a triol.
Claim 4
Dependent Claim
43 words
A process as claimed in 1 wherein the product of polyaddition of ethylene oxide and propylene oxide on a triol is first added to the anti-freeze in a proportion of from 1 to 15% by weight, before the anti-freeze is mixed with water.
Claim 5
Dependent Claim
14 words
A process as claimed in 1 wherein the heat-exchange liquid contains corrosion inhibiting agents.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1 in which the glycol is selected from the group consisting of ethyleneglycol and propyleneglycol.
Claim 7
Dependent Claim
48 words
As a novel industrial product, a heat exchange liquid composition comprising an aqueous solution containing from about 0.3 to about 5% by weight of the polyaddition product as defined in claim 1, 1 to 15% by weight of an anti-freeze based on a glycol, and corrosion inhibiting agents.
Claim 8
Dependent Claim
21 words
A product as claimed in claim 6 in which the glycol is selected from the group consisting of ethyleneglycol and propyleneglycol.
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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) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |