US3868276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating metal articles
Assignee: Occidental Chemical Corp
•
Filing: 1973-01-12
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Granted: 1975-02-25
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Expires: 1993-01-12
Abstract
Abstract Metal articles are coated by a process which comprises treating the metal articles with a non-aqueous phosphatizing solution containing a novolac phenol-formaldehyde resin having a molecular weight of from about 300 to 5,000, and chemically reacting the resin by heating the treated article at a temperature of at least about 190*C in the presence of an oxygen-containing atmosphere. The articles so treated are rendered exceptionally corrosion resistant and exhibit excellent retention of final finish coatings.
Inventors
- 👤 Malcolm H Shatz
- 👤 Edward Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:33
CPC Classifications
B; B05; B05D; B05D5/00; B05D5/10; C; C23; C23C; C23C22/00; C23C22/02; C23C22/03; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31688
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
137 words
A PROCESS FOR TREATING SURFACES OF ZINC, ALUMINUM, FERROUS METAL AND ALLOYS OF THESE TO RENDER THEM CORROSION-RESISTANT, PAINT-RECEPTIVE AND PAINT-RETENTIVE WHICH COMPRISES A. APPLYING TO SAID SURFACE A NON-AQUEOUS PHOSPHATIZING COMPOSITION WHICH CONSISTS ESSENTIALLY OF 0.1 TO 2.0 PERCENT BY WEIGHT PHOSPHORIC ACID, 3 TO 10 PERCENT BY WEIGHT OF A NOVOLAC PHENOL-FORMALDEHYDE RESIN HAVING A MOLECULAR WEIGHT OF FROM ABOUT 300 TO 5000 AND A NON-AQUEOUS SOLVENT FOR SAID PHOSPHORIC ACID AND SAID RESIN, SAID PHOSPHATIZING COMPOSITION BEING APPLIED IN AN AMOUNT SUFFICIENT TO PROVIDE ON SAID SURFACE A RESIN COATING WEIGHT OF FROM ABOUT 4 TO 400 MILLIGRAM PER SQUARE FOOT AND B. THEREAFTER, HEATING THE THUS-TREATED SURFACE AT A TEMPERATURE OF AT LEAST ABOUT 190*C. IN THE PRESENCE OF AN OXYGENCONTAINING ATMOSPHERE FOR A PERIOD OF FROM ABOUT 15 SEONDS TO 5 MINUTES.
Claim 2
Dependent Claim
137 words
A PROCESS FOR TREATING SURFACES OF ZINC, ALUMINUM, FERROUS METAL AND ALLOYS OF THESE TO RENDER THEM CORROSION-RESISTANT, PAINT-RECEPTIVE AND PAINT-RETENTIVE WHICH COMPRISES A. APPLYING TO SAID SURFACE A NON-AQUEOUS PHOSPHATIZING COMPOSITION WHICH CONSISTS ESSENTIALLY OF 0.1 TO 2.0 PERCENT BY WEIGHT PHOSPHORIC ACID, 3 TO 10 PERCENT BY WEIGHT OF A NOVOLAC PHENOL-FORMALDEHYDE RESIN HAVING A MOLECULAR WEIGHT OF FROM ABOUT 300 TO 5000 AND A NON-AQUEOUS SOLVENT FOR SAID PHOSPHORIC ACID AND SAID RESIN, SAID PHOSPHATIZING COMPOSITION BEING APPLIED IN AN AMOUNT SUFFICIENT TO PROVIDE ON SAID SURFACE A RESIN COATING WEIGHT OF FROM ABOUT 4 TO 400 MILLIGRAM PER SQUARE FOOT AND B. THEREAFTER, HEATING THE THUS-TREATED SURFACE AT A TEMPERATURE OF AT LEAST ABOUT 190*C. IN THE PRESENCE OF AN OXYGENCONTAINING ATMOSPHERE FOR A PERIOD OF FROM ABOUT 15 SEONDS TO 5 MINUTES.
Claim 3
Dependent Claim
15 words
A process as defined by claim 1 wherein the novolac resin is an ortho-novolac resin.
Claim 4
Dependent Claim
17 words
A process as defined by claim 2 wherein the resin has a molecular weight of about 1000.
Claim 5
Dependent Claim
16 words
A process as defined by claim 1 wherein the novolac resin is a random novolac resin.
Claim 6
Dependent Claim
17 words
A process as defined by claim 4 wherein the resin has a molecular weight of about 1000.
Claim 7
Dependent Claim
19 words
A process as defined by claim 1 wherein trichloroethylene is employed as the solvent in the non-aqueous phosphatizing solution.
Claim 8
Dependent Claim
23 words
A process a defined by claim 1 wherein a 50:50 carbon tetrachloride:acetone solution is employed as the solvent in the non-aqueous phosphatizing solution.
Claim 9
Dependent Claim
41 words
A process as defined by claim 1 wherein the surface is treated with the non-aqueous phosphatizing solution for a period of at least 60 seconds and heated at a temperature of About 205*C for a period of at least 60 seconds.
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |