US4067837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions
Assignee: PPG Industries Inc
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Filing: 1976-03-01
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Granted: 1978-01-10
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Expires: 1996-03-01
Abstract
Abstract A process is provided for preparing a hexavalent chromium containing emulsion coating composition without causing coagulation of the emulsion and for providing an emulsion coating composition containing at least one water insoluble particulate film-forming thermoplastic resin which is highly effective as a coating for a metal substrate to give new and improved results in the preparation of resin coated metals, particularly steel, aluminum, magnesium, and zinc surfaced articles including galvanized iron or steel.
Inventors
- 👤 Russell C. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:11
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C08; C08K; C08K3/00; C08K3/01; C08K3/013; C08K3/18; C08K3/24; C08K3/34; C09C; C09C1/00; C09C1/28; C09D133/00; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
102 words
A process of preparing a hexavalent chromium containing emulsion coating composition containing in the discontinuous phase at least one water insoluble particulate film forming thermoplastic resin reactive with hexavalent chromium to cause coagulation of said emulsion, and water in the continuous phase, wich comprises agitating a body of said emulsion and gradually adding to said body a dilute aqueous solution of an inorganic ionizable water soluble hexavalent chromium compound having a concentration of 1% to 10% by weight, calculated as Cr, while cooling and maintaining a pH within the range of 2 to 10.5 and maintaining said body in a non-foaming state.
Claim 2
Dependent Claim
102 words
A process of preparing a hexavalent chromium containing emulsion coating composition containing in the discontinuous phase at least one water insoluble particulate film forming thermoplastic resin reactive with hexavalent chromium to cause coagulation of said emulsion, and water in the continuous phase, wich comprises agitating a body of said emulsion and gradually adding to said body a dilute aqueous solution of an inorganic ionizable water soluble hexavalent chromium compound having a concentration of 1% to 10% by weight, calculated as Cr, while cooling and maintaining a pH within the range of 2 to 10.5 and maintaining said body in a non-foaming state.
Claim 3
Dependent Claim
32 words
A process as claimed in claim 1 in which said chromium compound is selected from the group consisting of sodium dichromate, potassium dichromate, ammonium dichromate, sodium chromate, potassium chromate and chromic acid.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 1 in which the temperature is maintained at approximately 70° F. to 80° F.
Claim 5
Dependent Claim
27 words
A process as claimed in claim 1 in which said body is rotated and said dilute solution is added to a peripheral portion of said rotating body.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 1 in which said solution of said hexavalent chromium compound is added dropwise to said body.
Claim 7
Dependent Claim
22 words
A process as claimed in claim 1 in which said emulsion also contains a compatible film forming thermosetting resin in particulate form.
Claim 8
Dependent Claim
15 words
A process as claimed in claim 1 in which said emulsion also contains a pigment.
Claim 9
Dependent Claim
20 words
A process as claimed in claim 7 in which said pigment has a particle size of 0.5 to 5 microns.
Claim 10
Dependent Claim
14 words
A process as claimed in claim 7 in which said pigment is calcium silicofluoride.
Claim 11
Dependent Claim
77 words
A process as claimed in claim 1 in which said emulsion also contains a water insoluble pigment, in which case the thermoplastic resin used in forming the emulsion is divided into two parts, the first part being emulsified in water and mixed with said aqueous solution of said water soluble hexavalent chromium compound and the second part being mixed with said pigment in sufficient proportions to coat said pigment, and said first and second parts being combined.
Claim 12
Dependent Claim
9 words
The product resulting from the process of claim 1.
Claim 13
Dependent Claim
9 words
The product resulting from the process of claim 7.
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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |