C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
204/91.23, 260/3
C07D 317/42 (2006.01)
Patent
CA 1198119
ABSTRACT Perfluoro-1,3-dioxole is a useful monomer, which polymerizes to either amorphous or liquid homopoly- mers and copolymerizes with tetrafluoroethylene as well as with other monomers to both crystalline and amorphous copolymers having one or more such comonomers incorporated therein. Amorphous homopolymers and copolymers of perfluoro-1,3-dioxole are useful in such applications as glazing for reactors for hydrogen fluoride reactions. Amorphous homopolymers and amorphous or crystalline copoly- mers form self-supporting films and can be used for coatings and linings which are inert to most chemicals and are stain and weather resistant and as dielectrics for electrical and electronic equipment. Liquid homopolymers can be used as hydraulic fluids and heat exchange media. Processes for the manufacture of 4,5-dichloro-2,2,4,5-tetrafluoro-1,3- dioxolane is also disclosed. The processes comprise either (i) chlorination of ethylene carbonate followed by fluorination with sulfur tetrafluoride and treatment with antimony trifluoride or HF in the presence of anti- mony pentachloride, or (ii) chlorination of 1,3-dioxolane followed by fluorination with antimony trifluoride or HF in the presence of antimony pentachloride. The resultant 4,5-dichloro-2,2,4,5-tetrafluoro-1,3-dioxolane may be used in the manufacture of perfluoro-1,3-dioxole.
462201
E.i. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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