Claims
- 1. The sealant composition comprising a coke oven door sealant for coke oven doors and joints and like installations which coke oven doors sealant remains effective as a sealant to prevent gas leakage from coke oven doors and joints and the like at temperatures up to about 200.degree. C., the coke oven door sealant having from about 25 to 55% polyvinyl acetate-based latex, said latex having a solids content of about 50% and having a pH of not less than about 4.5, the sealant having from about 10 to 25% water, and having from about 25 to 45% of a particulate filler, which is finer than 200 mesh British Standard, the coke oven door sealant having from about 5 to 15% of an inorganic fiber, at least about 40% of which fiber will pass through a 100 mesh British Standard sieve, the sealant composition further comprising from about 0.5 to about 5% of a blowing agent which decomposes in the temperature range from about 140.degree. to 225.degree. C. to give off a gas, the blowing agent tending to counteract any shrinkage tendency of the coke oven door sealant being effective as a sealant against gas leakage during a cycle of use, with any shrinkage tendency of the coke oven door sealant being counteracted by the blowing agent, for several hours at temperatures of up to about 200.degree. C. and the coke oven door sealant being effective as a gas sealant and remaining flexible at temperatures of up to about 80.degree. C. for several months.
- 2. A sealant composition according to claim 1, which contains less than 1% of the blowing agent.
- 3. A sealant composition according to claim 1, in which the blowing agent comprises a mixture of a first blowing agent in the range of about 140.degree. to 160.degree. C. and a second blowing agent blowing in the range of about 190.degree. to 220.degree. C.
- 4. A sealant composition according to claim 3, in which the first and second blowing agents are mixed in a ratio by weight of from about 3:1 to about 1:3 respectively.
- 5. A sealant according to claim 3, in which the first and second blowing agents are mixed in a ratio of about 1:1.
- 6. A sealant composition according to claim 1, in which the particulate filler is a talc.
- 7. A sealant composition according to claim 1, in which the fiber is selected from a group of fibers consisting of asbestos fiber and ceramic fiber.
Priority Claims (1)
Number |
Date |
Country |
Kind |
13420/76 |
Apr 1976 |
GBX |
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Parent Case Info
This is a division of application Ser. No. 109,023 filed Jan. 2, 1980, which was a continuation of application Ser. No. 777,055 filed Mar. 14, 1977.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
Country |
Parent |
109023 |
Jan 1980 |
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Continuations (1)
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Number |
Date |
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Parent |
777055 |
Mar 1977 |
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