US4227946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
No-rinse pre-paint coating composition and method
Assignee: OAKITE PRODUCTS Inc A DE CORP
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Filing: 1979-02-09
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Granted: 1980-10-14
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Expires: 1999-02-09
Abstract
Abstract An acid aqueous coating composition and concentrate of chromic acid and chromium phosphate derived from phosphoric acid resulting from the oxidation of hypophosphorous acid in reacting with the chromic acid. The chromic acid is present in a stoichiometrically equivalent amount from about one percent to about one hundred percent over that needed to oxidize hypophosphorous acid to phosphoric acid. The composition may also contain a non-foaming wetting agent and particulate silica.
Inventors
- 👤 Stanley C. Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:57
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/33
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
184 words
An acid, aqueous composition containing by weight dissolved in its water: chromic acid and chromium phosphate as derived from phosphoric acid resulting from the oxidation of hypophosphorous acid in reacting with the chromic acid which latter is present in a stoichiometrically equivalent amount from about one percent to about one hundred percent over that needed to oxidize hypophosphorous acid to phosphoric acid, from none to about 0.01% of a non-foaming to low foaming wetting agent inert to iron, steel, galvanized iron or steel, zinc, aluminum, copper and brass, to the acidity of the composition and to oxidation; from none to about seven percent of particulate silica of from about 4 to about 60 millimicrons particle size, and which composition is selected from: (i) a concentrate with its aforesaid dispersed total solids content being from about two percent to an amount below that at which the composition will gel under its storage conditions; and (ii) a metal treating bath having as its total dispersed solids content the amount thereof provided by from about two percent to about fifteen percent by volume of the aforesaid concentrate.
Claim 2
Dependent Claim
184 words
An acid, aqueous composition containing by weight dissolved in its water: chromic acid and chromium phosphate as derived from phosphoric acid resulting from the oxidation of hypophosphorous acid in reacting with the chromic acid which latter is present in a stoichiometrically equivalent amount from about one percent to about one hundred percent over that needed to oxidize hypophosphorous acid to phosphoric acid, from none to about 0.01% of a non-foaming to low foaming wetting agent inert to iron, steel, galvanized iron or steel, zinc, aluminum, copper and brass, to the acidity of the composition and to oxidation; from none to about seven percent of particulate silica of from about 4 to about 60 millimicrons particle size, and which composition is selected from: (i) a concentrate with its aforesaid dispersed total solids content being from about two percent to an amount below that at which the composition will gel under its storage conditions; and (ii) a metal treating bath having as its total dispersed solids content the amount thereof provided by from about two percent to about fifteen percent by volume of the aforesaid concentrate.
Claim 3
Dependent Claim
19 words
The concentrate composition as embraced in claim 1, wherein the maximum of its total solids content is about 30%.
Claim 4
Dependent Claim
16 words
A concentrate composition as claimed in claim 2, wherein the total solids content is about 20%.
Claim 5
Dependent Claim
48 words
A concentrate composition as claimed in claim 2, wherein the chromium phosphate content is that corresponding to what is obtained from about 7% to 7.3% of 50% aqueous hypophosphorous acid, and the chromic acid content is that corresponding to from about 10.5% to about 11% of chromium trioxide.
Claim 6
Dependent Claim
41 words
A concentrate composition as claimed in claim 4, wherein the total solids content includes (a) chromium phosphate in an amount corresponding to about 7.11% of hypophosphorous acid and (b) chromic acid in an amount corresponding to about 10.8% of chromium trioxide.
Claim 7
Dependent Claim
24 words
A concentrate composition as claimed in claim 5, wherein the solids content includes also about 0.0045% to about 0.01% of an anionic wetting agent.
Claim 8
Dependent Claim
17 words
A concentrate composition as claimed in claim 5, wherein the wetting agent is present in about 0.0045%.
Claim 9
Dependent Claim
19 words
A concentrate composition as claimed in claim 5, wherein the solids content includes also about 3.4% of particulate silica.
Claim 10
Dependent Claim
21 words
A concentrate composition as claimed in claim 8, wherein the solids content includes also about 0.0045% of an anionic wetting agent.
Claim 11
Dependent Claim
43 words
An aqueous treating bath for applying to the surface of any of the metals named in claim 1 a metal-treating-film which on drying serves as a paint pre-coat, which bath comprises from about 2% to about 15% of the concentrate of claim 1.
Claim 12
Dependent Claim
23 words
A treating bath as claimed in claim 10, which comprises from about 5% to 10% of the concentrate referred to in claim 10.
Claim 13
Dependent Claim
14 words
A treating bath as claimed in claim 10 or 11, which contains no silica.
Claim 14
Dependent Claim
13 words
A treating bath as claimed in claim 10 or 11, which contains silica.
Claim 15
Dependent Claim
13 words
A treating bath as claimed in claim 10, which contains no wetting agent.
Claim 16
Dependent Claim
12 words
A treating bath as claimed in claim 14, which contains no silica.
References Cited (Backward Citations)
US2768104A
Cited
US3720549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |