US3890165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Passivation of materials which come into contact with peroxygen compounds
Assignee: FMC Corp
•
Filing: 1972-08-09
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Granted: 1975-06-17
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Expires: 1992-08-09
Abstract
Abstract Metal surfaces that are to come into contact with peroxygen compounds, such as hydrogen peroxide or peracetic acid, are passivated, that is treated prior to use to prevent them from decomposing and discoloring the peroxygen compound. This is achieved by treatment of the metal articles and the surface with a hot solution of a polyphosphoric acid, an alkali metal polyphosphate, and/or an alkali metal organophosphate. Polyolefin surfaces are similarly passivated at room temperature and above.
Inventors
- 👤 Hsiang Peng Liao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:27
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C01; C01B; C01B15/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
A METHOD OF PASSIVATING A STAINLESS STEEL, ALUMINIUM OR ALUMINUM ALLOY SURFACE THAT IS TO COME INTO CONTACT WITH A PEROXYGEN COMPOUND, COMPRISING CONTACTING THE SURFACE WITH A LIQUID TREATING AGENT. SAID LIQUID TREATING AGENT BEING A SOLUTION CONSISTING ESSENTIALLY OF A SOLVENT CONTAINING 0.5 TO 10% BY WEIGHT OF A MEMBER OF THE GROUP CONSISTING OF NA(2ETHYLHEXYL)5(P3O10)2 AND NA5(CAPRYL)5(P30O10)2, AT A TEMPERATURE OF 50* TO 100*C. FOR AT LEAST 5 MINUTES.
Claim 2
Independent Claim
72 words
A METHOD OF PASSIVATING A STAINLESS STEEL, ALUMINIUM OR ALUMINUM ALLOY SURFACE THAT IS TO COME INTO CONTACT WITH A PEROXYGEN COMPOUND, COMPRISING CONTACTING THE SURFACE WITH A LIQUID TREATING AGENT. SAID LIQUID TREATING AGENT BEING A SOLUTION CONSISTING ESSENTIALLY OF A SOLVENT CONTAINING 0.5 TO 10% BY WEIGHT OF A MEMBER OF THE GROUP CONSISTING OF NA(2ETHYLHEXYL)5(P3O10)2 AND NA5(CAPRYL)5(P30O10)2, AT A TEMPERATURE OF 50* TO 100*C. FOR AT LEAST 5 MINUTES.
Claim 3
Dependent Claim
21 words
The method of claim 1 in which the treatment is carried out for a period of 5 minutes to 24 hours.
Claim 4
Dependent Claim
17 words
The method of claim 1 in which the the solutions contain water or acetic acid as solvents.
Claim 5
Independent Claim
110 words
The method of passivating a polyethylene or polypropylene surface that is to come into contact with a peroxygen compound, comprising contacting the surface with a liquid treating agent selected from the group consisting of solutions of alkali metal polyphosphates having phosphorus-oxygen chain lengths of 2 to 20, solutions of glassy alkali metal polyphosphates having phosphorus-oxygen chain lengths of 6 to 40, solutions of alkali metal organopolyphosphates of the general formula M5R5(P3O10)2 wherein M is an alkali metal and R is an alkyl group containing 1 to 10 carbon atoms, and polyphosphoric acids having P2O5 concentrations greater than 72.4%, at a temperature of 20* to 80*C. for at least 5 minutes.
Claim 6
Independent Claim
110 words
The method of passivating a polyethylene or polypropylene surface that is to come into contact with a peroxygen compound, comprising contacting the surface with a liquid treating agent selected from the group consisting of solutions of alkali metal polyphosphates having phosphorus-oxygen chain lengths of 2 to 20, solutions of glassy alkali metal polyphosphates having phosphorus-oxygen chain lengths of 6 to 40, solutions of alkali metal organopolyphosphates of the general formula M5R5(P3O10)2 wherein M is an alkali metal and R is an alkyl group containing 1 to 10 carbon atoms, and polyphosphoric acids having P2O5 concentrations greater than 72.4%, at a temperature of 20* to 80*C. for at least 5 minutes.
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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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |