Electric heating – Heating devices – With heating unit structure
Patent
1988-02-01
1990-03-20
Reynolds, Bruce A.
Electric heating
Heating devices
With heating unit structure
219542, 219544, 219553, 219504, 174110FC, 174DIG8, H05B 310
Patent
active
049103903
ABSTRACT:
Curable compositions which are useful for encapsulating electrical connections and for joining metals to metals, and which comprise a mixture of high and low molecular weight fluorocarbon elastomers. Preferred compositions comprise a mixture of three fluorocarbon elastomers, the first having a Mooney viscosity at 121.degree. C. of at least 120, the second a Mooney viscosity at 121.degree. C. of 80 to 110, and the third a Brookfield viscosity at 100.degree. C. of 1,000 to 4,000 centipoises, in amounts 5 to 50%, 25 to 70% and 5 to 50% respectively, based on the weight of the polymeric component. The compositions can be easily molded under heat and pressure, and after they have been cured, they have remarkable resistance to degradation by hot liquids, even under pressure. Consequently, the compositions are very useful in the manufacture of self-regulating heaters for use in heating the production tubes of oil wells.
REFERENCES:
patent: 4421878 (1983-12-01), Close
patent: 4568401 (1986-02-01), Davis
patent: 4628003 (1986-12-01), Katz
patent: 4634615 (1987-01-01), Versteegh et al.
patent: 4666642 (1987-05-01), Glaister
patent: 4722758 (1988-02-01), Barrett
Barrett Len
Batliwalla Neville
Gac Norman A.
Rinde James
Burkard Herbert G.
Fuller Leon K.
Raychem Corporation
Reynolds Bruce A.
Richardson Timothy H. P.
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