US3947397A
Expired / Lapsed
US
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Aqueous coating compositions for asbestos-cement and the like
Assignee: Arkema Inc
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Filing: 1974-02-28
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Granted: 1976-03-30
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Expires: 1994-02-28
Abstract
Abstract Pigmented, in situ reduced zinc dichromate coatings on asbestos-cement and similar surfaces are made more reproducible in color by including as at least a portion of the reducing agent a hexitol or pentitol such as sorbitol, or a low alkanolamine, or mixtures of these. An acid like phosphoric acid that forms a water-insoluble calcium salt but does not precipitate the zinc can also be added to the coating formulation.
Inventors
- 👤 Ludwig K. Schuster
- 👤 Singkata Tongyai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:07
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/60; C04B41/61; C04B41/65; C04B41/45; C04B41/50; C04B41/5007; C04B41/62; C04B41/63; C09; C09D; C09D125/00; C09D125/02; C09D125/04; C09D125/08; C09D125/10; C09D133/00; C09D133/04; C09D133/06; C09D17/00; C09D17/001; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2962; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
In an aqueous concentrate for preparing a curable coating mixture to be applied to asbestos-cement, which concentrate contains a dispersed acrylic or butadienestyrene resin, dispersed pigment in an amount at least one-eighth that of the resin by weight, and a reducing agent for hexavalent chromium, said reducing agent including oxidizable dispersing agent, the improvement according to which the reducing agent, also includes a mixture of sorbitol and lower alkanolamine totaling about one-fourth to about one-half the weight of the pigment, said sorbitol and said alkanolamine each being at least one-third of the total reducing agent.
Claim 2
Dependent Claim
95 words
In an aqueous concentrate for preparing a curable coating mixture to be applied to asbestos-cement, which concentrate contains a dispersed acrylic or butadienestyrene resin, dispersed pigment in an amount at least one-eighth that of the resin by weight, and a reducing agent for hexavalent chromium, said reducing agent including oxidizable dispersing agent, the improvement according to which the reducing agent, also includes a mixture of sorbitol and lower alkanolamine totaling about one-fourth to about one-half the weight of the pigment, said sorbitol and said alkanolamine each being at least one-third of the total reducing agent.
Claim 3
Dependent Claim
124 words
In a coating formulation containing an aqueous dispersion of an acrylic or thermosetting butadiene-styrene resin, coloring pigment, dissolved zinc dichromate in an amount from about 1 to about 5 times the weight of the resin, and a reducing agent in an amount that is compatible in the dispersion for at least about 2 hours at room temperabure but that causes substantially complete reduction of the chromium to trivalent condition when the dispersion is dried and heated to 180°C, said reducing agent including oxidizable dispersing agent, the improvement according to which the reducing agent, also includes a mixture of a lower alkanolamine with a hexitol or pentitol, the lower alkanolamine and the hexitol or pentitol each being at least one-third of the total reducing agent.
Claim 4
Dependent Claim
124 words
In a coating formulation containing an aqueous dispersion of an acrylic or thermosetting butadiene-styrene resin, coloring pigment, dissolved zinc dichromate in an amount from about 1 to about 5 times the weight of the resin, and a reducing agent in an amount that is compatible in the dispersion for at least about 2 hours at room temperabure but that causes substantially complete reduction of the chromium to trivalent condition when the dispersion is dried and heated to 180°C, said reducing agent including oxidizable dispersing agent, the improvement according to which the reducing agent, also includes a mixture of a lower alkanolamine with a hexitol or pentitol, the lower alkanolamine and the hexitol or pentitol each being at least one-third of the total reducing agent.
Claim 5
Dependent Claim
132 words
In a coating mixture containing an aqueous dispersion of an acrylic or thermosetting butadiene-styrene resin, coloring pigment, dissolved zinc dichromate in an amount from about 1 to about 5 times the weight of the resin, and a reducing agent in an amount compatible in the dispersion for at least about 2 hours at room temperature but that causes substantially complete reduction of the chromium to trivalent condition when the dispersion is dried and heated to 180°C, said reducing agent including including oxidizable dispersing agent, the improvement according to which the reducing agent, also includes a hexitol or pentitol, the hexitol or pentitol is at least about one-third of the reducing agent, and the mixture also contains phosphoric acid in an amount about one-fourth to about one-half the weight of the zinc dichromate.
Claim 6
Dependent Claim
132 words
In a coating mixture containing an aqueous dispersion of an acrylic or thermosetting butadiene-styrene resin, coloring pigment, dissolved zinc dichromate in an amount from about 1 to about 5 times the weight of the resin, and a reducing agent in an amount compatible in the dispersion for at least about 2 hours at room temperature but that causes substantially complete reduction of the chromium to trivalent condition when the dispersion is dried and heated to 180°C, said reducing agent including including oxidizable dispersing agent, the improvement according to which the reducing agent, also includes a hexitol or pentitol, the hexitol or pentitol is at least about one-third of the reducing agent, and the mixture also contains phosphoric acid in an amount about one-fourth to about one-half the weight of the zinc dichromate.
Claim 7
Dependent Claim
129 words
In a coating mixture containing an aqueous dispersion of an acrylic or thermosetting butadiene-styrene resin, coloring pigment, dissolved zinc dichromate in an amount from about 1 to about 5 times the weight of the resin, and a reducing agent in an amount compatible in the dispersion for at least about 2 hours at room temperature but that causes substantially complete reduction of the chromium to trivalent condition when the dispersion is dried and heated to 180°C, said reducing agent including oxidizable dispersing agent, the improvement according to which the reducing agent, also includes a lower alkanolamine, the lower alkanolamine is at least about one-third of the reducing agent, and the mixture also contains phosphoric acid in an amount about one-fourth to about one-half the weight of the zinc dichromate.
Claim 8
Dependent Claim
129 words
In a coating mixture containing an aqueous dispersion of an acrylic or thermosetting butadiene-styrene resin, coloring pigment, dissolved zinc dichromate in an amount from about 1 to about 5 times the weight of the resin, and a reducing agent in an amount compatible in the dispersion for at least about 2 hours at room temperature but that causes substantially complete reduction of the chromium to trivalent condition when the dispersion is dried and heated to 180°C, said reducing agent including oxidizable dispersing agent, the improvement according to which the reducing agent, also includes a lower alkanolamine, the lower alkanolamine is at least about one-third of the reducing agent, and the mixture also contains phosphoric acid in an amount about one-fourth to about one-half the weight of the zinc dichromate.
Claim 9
Dependent Claim
106 words
In an aqueous concentrate for preparing a curable color-reproducible protective coating composition, which concentrate contains a dispersed acrylic or butadienesytrene resin and a reducing agent for hexavalent chromium, said reducing agent including oxidizable dispersing agent, includes a mixture of a lower alkanolamine and a hexitol or pentitol, the hexitol or pentitol and the lower alkanolamine each being in an amount at least one-third that needed to reduce to trivalent condition the hexavalent chromium in a quantity of zinc dichromate from 1 to 5 times the weight of the resin, and the total reducing mixture being sufficient to reduce all of that hexavalent chromium to trivalent condition.
Claim 10
Dependent Claim
106 words
In an aqueous concentrate for preparing a curable color-reproducible protective coating composition, which concentrate contains a dispersed acrylic or butadienesytrene resin and a reducing agent for hexavalent chromium, said reducing agent including oxidizable dispersing agent, includes a mixture of a lower alkanolamine and a hexitol or pentitol, the hexitol or pentitol and the lower alkanolamine each being in an amount at least one-third that needed to reduce to trivalent condition the hexavalent chromium in a quantity of zinc dichromate from 1 to 5 times the weight of the resin, and the total reducing mixture being sufficient to reduce all of that hexavalent chromium to trivalent condition.
Claim 11
Dependent Claim
13 words
The combination of claim 2 in which the hexitol or pentitol is sorbitol.
Claim 12
Dependent Claim
27 words
The combination of claim 2 in which the dispersion also contains phosphric acid in an amount about one-fourth to about one-half the weight of the zinc dichromate.
Claim 13
Dependent Claim
19 words
The combination of claim 7 in which the dispersion also contains a volatile amine that partially neutralizes the mixture.
Claim 14
Dependent Claim
25 words
The combination of claim 5 in which the hexitol or pentitol is sorbitol and the concentrate has a solute content of at least about 40%.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |