US4138276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions
Assignee: PPG Industries Inc
•
Filing: 1977-10-25
•
Granted: 1979-02-06
•
Expires: 1997-10-25
Abstract
Abstract A process is provided for coating 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
2026-10-28 18:46
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; C; C08; C08K; C08K3/00; C08K3/10; C08K3/16; C08K3/34; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
115 words
A process of protecting metals which comprises coating said metals with a coating composition consisting essentially of: ______________________________________
Ingredients Weight %
(a) resin solids of at least one organic film
forming resin selected from the group
consisting of thermoplastic resins,
thermosetting resins, and mixtures thereof
10-60
(b) silicofluoride of calcium, magnesium,
strontium or barium 0.5-20
(c) hexavalent inorganic chromium compound as Cr
0-10
(d) pigments and pigment extenders other than (b)
0-100 of
resin
(e) driers up to 0.5 of
total solids
(f) coalescent agents 0.05-10
(g) dispersants 0.05-6
(h) defoamers 0-0.05
(i) surfactants 0.01-3
(j) thickening agents trace to
10.0% by
weight
resin
(k) water including water soluble additives
5-65
to enhance stability
______________________________________
Claim 2
Dependent Claim
115 words
A process of protecting metals which comprises coating said metals with a coating composition consisting essentially of: ______________________________________
Ingredients Weight %
(a) resin solids of at least one organic film
forming resin selected from the group
consisting of thermoplastic resins,
thermosetting resins, and mixtures thereof
10-60
(b) silicofluoride of calcium, magnesium,
strontium or barium 0.5-20
(c) hexavalent inorganic chromium compound as Cr
0-10
(d) pigments and pigment extenders other than (b)
0-100 of
resin
(e) driers up to 0.5 of
total solids
(f) coalescent agents 0.05-10
(g) dispersants 0.05-6
(h) defoamers 0-0.05
(i) surfactants 0.01-3
(j) thickening agents trace to
10.0% by
weight
resin
(k) water including water soluble additives
5-65
to enhance stability
______________________________________
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1 in which (c) constitutes 0.05 to 10% by weight.
Claim 4
Dependent Claim
55 words
A process of protecting metals which comprises coating said metals with a coating composition as claimed in claim 1 and thereafter removing water from said composition, the amount of said composition applied to the metal being sufficient to produce a uniform coating having a wet thickness within the range of 0.05 mil to 10 mils.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 3 in which the thickness of the wet coating is within the range of 0.1 to 0.3 mil.
Claim 6
Dependent Claim
31 words
A process as claimed in claim 3 in which the metal to which the coating composition is applied is steel and the pH of the coating composition is less than 7.
Claim 7
Dependent Claim
52 words
A process as claimed in claim 3 in which the metal to which the coating composition is applied is galvanized iron, the pH of the composition is at least 7 and the quantity of hexavalent chromium, as Cr, applied to the metal does not exceed 10 micrograms per square inch of metal.
Claim 8
Dependent Claim
20 words
A process as claimed in claim 3 in which the metal to which the coating composition is applied is aluminum.
Claim 9
Dependent Claim
37 words
A process as claimed in claim 3 in which said emulsion coating composition is alkaline and the alkalinity is attributable at least in part to a compound from the group consisting of ammonium hydroxide, diethanolamine and dimethylethanolamine.
Claim 10
Dependent Claim
88 words
A process as claimed in claim 3 in which water is removed from the wet coating of the coating composition and the composition is cured after it has been applied to the metal by heating to temperatures within the range of 400 to 600° F. for periods of from 30 seconds to 3 minutes, the time of heating being longer at the lower temperatures and shorter at the higher temperatures and being sufficient to form a coating having a pencil hardness within the range of H to 2H.
Claim 11
Dependent Claim
42 words
A process as claimed in claim 3 in which said coating composition contains a pigment consisting essentially of CaSiF 6 and 0% to 10% by weight, calculated as Cr, of hexavalent chromium added as an inorganic ionizable water soluble hexavalent chromium compound.
Claim 12
Dependent Claim
70 words
A process of protecting metals which comprises coating said metals with a coating composition comprising an emulsion of at least one organic film-forming resin selected from the group consisting of thermoplastic resins, thermosetting resins and mixtures thereof, together with 0.5-20% by weight of said composition of a silicofluoride of calcium, magnesium, strontium or barium and 0-10% by weight of said composition of a hexavalent inorganic chromium compound, calculated as Cr.
Claim 13
Dependent Claim
70 words
A process of protecting metals which comprises coating said metals with a coating composition comprising an emulsion of at least one organic film-forming resin selected from the group consisting of thermoplastic resins, thermosetting resins and mixtures thereof, together with 0.5-20% by weight of said composition of a silicofluoride of calcium, magnesium, strontium or barium and 0-10% by weight of said composition of a hexavalent inorganic chromium compound, calculated as Cr.
Claim 14
Dependent Claim
26 words
A process as claimed in claim 11 in which the metal to which the coating composition is applied is aluminum and the silicofluoride is calcium silicofluoride.
Claim 15
Dependent Claim
27 words
A process as claimed in claim 11 in which the metal to which the coating composition is applied is galvanized iron and the silicofluoride is calcium silicofluoride.
Claim 16
Dependent Claim
16 words
A process as claimed in claim 11 in which the metal to be protected is aluminum.
Claim 17
Dependent Claim
25 words
A process as claimed in claim 11 in which said coating composition contains 0.05-10% by weight of a hexavalent inorganic chromium compound, calculated as Cr.
Claim 18
Dependent Claim
16 words
A process as claimed in claim 15 in which the metal to be protected is aluminum.
Claim 19
Dependent Claim
57 words
A process as claimed in claim 11 in which said silicofluoride is calcium silicofluoride in the form of a mixed pigment with a hexavalent inorganic chromium compound in an amount corresponding to 0.05-10% by weight of said composition, calculated as Cr, and the average particle size of said mixed pigment is within the range of 0.5-10 microns.
Claim 20
Dependent Claim
20 words
A process as claimed in claim 17 in which the metal to which the coating composition is applied is aluminum.
References Cited (Backward Citations)
US2902390A
Cited
US3026281A
Cited
US3053692A
Cited
US3185596A
Cited
US3585084A
Cited
US4030945A
Cited
US3963472A
Cited
US3647567A
Cited
US3936546A
Cited
US4067837A
Cited
US4032675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |