US4266975A
Expired / Lapsed
US
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Anticorrosive coating composition
Assignee: Diamond Shamrock Corp
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Filing: 1980-04-03
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Granted: 1981-05-12
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Expires: 2000-04-03
Abstract
Abstract An anticorrosive coating composition comprising particulate metal, a chromic acid constituent, at least one organic liquid substance and a pH modifier if necessary, in which a part of the chromic acid constituent is replaced with boric acid component, is disclosed. Resulting coatings over metal substrates display excellent corrosion-resistant properties in fresh water environments as well as in salt water environments.
Inventors
- 👤 Takao Higashiyama
- 👤 Toshio Nishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:00
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74; C09; C09D; C09D5/00; C09D5/08; C09D5/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
60 words
In a substantially resin-free aqueous coating composition for application to metal substrates, comprising a chromic acid constituent, particulate metal and at least one high-boiling organic oxohydroxy liquid having a molecular weight of 300 or less; the improvement comprising a boric acid component in an amount of 5 to 95% by weight of the chromic acid constituent and boric acid component.
Claim 2
Dependent Claim
60 words
In a substantially resin-free aqueous coating composition for application to metal substrates, comprising a chromic acid constituent, particulate metal and at least one high-boiling organic oxohydroxy liquid having a molecular weight of 300 or less; the improvement comprising a boric acid component in an amount of 5 to 95% by weight of the chromic acid constituent and boric acid component.
Claim 3
Dependent Claim
11 words
The coating composition of claim 1 further containing a pH modifier.
Claim 4
Dependent Claim
27 words
The coating composition of claim 1 wherein said particulate metal is metal flake selected from the group consisting of zinc, aluminum, mixtures thereof and alloys of same.
Claim 5
Dependent Claim
13 words
The coating composition of claim 1 further characterized by containing nonionic dispersing agent.
Claim 6
Dependent Claim
12 words
The coating composition of claim 1 further characterized by containing viscosity modifier.
Claim 7
Dependent Claim
79 words
An aqueous anticorrosive coating composition for application to metal substrates according to claim 1 comprising: (a) 10 to 40 percent, by weight, of particulate metal; (b) 1 to 12 percent, by weight, of a mixture of water-soluble chromic acid constituent and boric acid component, with the boric acid component contributing from 5 percent to 95 percent of said mixture; (c) 7 to 30 percent of organic liquid; and (d) 0 to 4 percent, by weight, of a pH modifier.
Claim 8
Dependent Claim
41 words
The coating composition of claim 6 wherein said pH modifier is selected from the group consisting of oxides, carbonates and hydroxides of alkali metals, metals of group IIA, and group IIB of the Periodic Table of the Elements, and mixtures thereof.
Claim 9
Dependent Claim
32 words
The coating composition of claim 6 wherein said particulate metal is selected from the group consisting of zinc flake, aluminum flake, mixed flake of aluminum and zinc and flake of zinc-aluminum alloy.
Claim 10
Dependent Claim
34 words
The coating composition of claim 6 wherein the water soluble chromic acid constituent is selected from the group consisting of chromic acid, water-soluble metal salts of chromic acid, bichromic acid salts, and mixtures thereof.
Claim 11
Dependent Claim
27 words
The coating composition of claim 6 wherein said boric acid component is selected from the group consisting of orthoboric acid, metaboric acid, tetraboric acid, and boron oxide.
Claim 12
Dependent Claim
28 words
The coating composition of claim 6 wherein said pH modifier is selected from oxides, carbonates and hydroxides of lithium, strontium, calcium, barium, magnesium, zinc, cadmium, and mixtures thereof.
Claim 13
Dependent Claim
37 words
The coating composition of claim 6 wherein said high-boiling organic liquid is selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol, tetraethylene glycol, diacetone alcohol and mixtures thereof.
Claim 14
Dependent Claim
13 words
The coating composition of claim 6 further characterized by containing nonionic dispersing agent.
Claim 15
Dependent Claim
47 words
The coating composition of claim 6 wherein the particulate metal content is 15 to 30 percent, by weight, the chromic acid constituent plus boric acid component content is 2 to 8 percent, by weight, and the high-boiling organic liquid content is 12 to 25 percent, by weight.
Claim 16
Dependent Claim
16 words
The coating composition of claim 6 wherein the boric acid component is 10 to 75 percent.
Claim 17
Dependent Claim
16 words
The coating composition of claim 6 further characterized by being substantially resin-free while containing viscosity modifier.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |