Patent US3884851A successfully refreshed from Google Patents.
US3884851A
Expired / Lapsed
US
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Primer for treating metal surfaces
Assignee: Kop Coat Inc
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Filing: 1972-05-19
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Granted: 1975-05-20
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Expires: 1992-05-19
Abstract
Abstract A primer composition for treating metal surfaces prior to applying coal tar enamel is provided. The cured primer coating is essentially the reaction product of chlorinated rubber and a polyamide resin. Plasticizers and pigments optionally may be included in the composition. The cured primer coating gives improved adhesion between the primed metal surfaces and a finishing coat of coal tar enamel. The primer composition, when plasticized with coal tar heavy oil is the only hereto known primer suitable for use with coal tar enamels made from high volatile containing coals.
Inventors
- 👤 Woodrow E Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:51
CPC Classifications
C; C09; C09D; C09D115/00; C09D115/02; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016; C08K5/04; C08K5/15; C08K5/151; C08K5/1515; C08L; C08L77/00; C08L77/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
166 words
A storage stable coating composition for the priming of a metal surface, said coating composition consisting essentially of, by weight: a. 1 part chlorinated natural rubber having about 50 to 67% by weight total chlorine; b. from 1/8 to 1 part of a polyamide resin that is the condensation product of a polyalkylene - polyamine and an unsaturated fatty acid; c. from one one-hundredth to one-twentieth part of a volatile organic acid and chloroacetic acid; and d. from 1 to 3 parts of an inert volatile solvent that has an evaporation rate between the evaporation rate of toluene and high flash naphtha and that dissolves the chlorinated rubber, and said polyamide resin being present in said solvent in reactive proportions but stabilized by the presence of said organic acid so that the composition displays an indefinite shelf life in a sealed container but after application to a metal surface a crosslinking reaction occurs between the chlorinated rubber and polyamide resin to form an insoluble infusible coating.
Claim 2
Dependent Claim
166 words
A storage stable coating composition for the priming of a metal surface, said coating composition consisting essentially of, by weight: a. 1 part chlorinated natural rubber having about 50 to 67% by weight total chlorine; b. from 1/8 to 1 part of a polyamide resin that is the condensation product of a polyalkylene - polyamine and an unsaturated fatty acid; c. from one one-hundredth to one-twentieth part of a volatile organic acid and chloroacetic acid; and d. from 1 to 3 parts of an inert volatile solvent that has an evaporation rate between the evaporation rate of toluene and high flash naphtha and that dissolves the chlorinated rubber, and said polyamide resin being present in said solvent in reactive proportions but stabilized by the presence of said organic acid so that the composition displays an indefinite shelf life in a sealed container but after application to a metal surface a crosslinking reaction occurs between the chlorinated rubber and polyamide resin to form an insoluble infusible coating.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein said composition includes up to one-fifth part of a plasticizer for improving the flexibility of the cured primer coating.
Claim 4
Dependent Claim
24 words
The composition of claim 2 wherein said plasticizer is a chlorinated polyphenyl, a chlorinated wax a diphenyl phosphate or a coal tar heavy oil.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein said composition includes an inorganic pigment.
Claim 6
Dependent Claim
29 words
The composition of claim 1 wherein said composition includes a stabilizer selected from the group consisting of epichlorohydrin and propylene oxide to protect against decomposition of the chlorinated rubber.
Claim 7
Dependent Claim
93 words
A COATING COMPOSITION FOR THE PRIMING OF A METAL SURFACE, SAID COATING COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT: A. 1 PART CHLORINATED NATURAL RUBBER HAVING ABOUT 50 TO 67% BY WEIGHT TOTAL CHLORINE; B. FROM 1/18 TO 1 PART OF A POLYAMIDE RESIN THAT IS THE CONDENSATION PRODUCT OF A POLYALKYLENE-POLYAMINE AND AN UNSATURATED FATTY ACID; AND C. FROM 1 TO 3 PARTS OF AN INERT VOLATILE SOLVENT THAT HAS AN EVAPORATION RATE BETWEEN THE EVAPORATION RATE OF TOLUENE AND HIGH FLASH NAPHTHA AND THAT DISSOLVES BOTH SAID CHLORINATED RUBBER AND POLYAMIDE RESIN.
Claim 8
Dependent Claim
93 words
A COATING COMPOSITION FOR THE PRIMING OF A METAL SURFACE, SAID COATING COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT: A. 1 PART CHLORINATED NATURAL RUBBER HAVING ABOUT 50 TO 67% BY WEIGHT TOTAL CHLORINE; B. FROM 1/18 TO 1 PART OF A POLYAMIDE RESIN THAT IS THE CONDENSATION PRODUCT OF A POLYALKYLENE-POLYAMINE AND AN UNSATURATED FATTY ACID; AND C. FROM 1 TO 3 PARTS OF AN INERT VOLATILE SOLVENT THAT HAS AN EVAPORATION RATE BETWEEN THE EVAPORATION RATE OF TOLUENE AND HIGH FLASH NAPHTHA AND THAT DISSOLVES BOTH SAID CHLORINATED RUBBER AND POLYAMIDE RESIN.
Claim 9
Dependent Claim
25 words
The composition of claim 6 wherein said composition includes up to one-fifth part of a plasticizer for improving the flexibility of the cured primer coating.
Claim 10
Dependent Claim
24 words
The composition of claim 7 wherein said plasticizer is a chlorinated polyphenyl, a chlorinated wax a diphenyl phosphate or a coal tar heavy oil.
Claim 11
Dependent Claim
12 words
The composition of claim 6 wherein said composition includes an inorganic pigment.
Claim 12
Dependent Claim
29 words
The composition of claim 6 wherein said composition includes a stabilizer selected from the group consisting of epichlorohydrin and propylene oxide to protect against decomposition of the chlorinated rubber.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |