Patent GB-931600-A (GB)
Title: Adducts and telomers of olefines and sulphur halogen compounds
Inventor: CASE JOHN REGINALD
IPC: C07C381/00
Filed: 1960-05-09
Abstract: 1:1 and higher telomers and cotelomers of sulphur chloride pentafluoride with such olefines and halogen-substituted olefines as are themselves able to be homopolymerized by means of freeradical-producing catalysts are obtained by heating sulphur chloride pentafluoride with one or more of said olefines or halogen-substituted olefines at autogenous pressure in a closed vessel in the presence of an added free-radical-producing compound. The temperature is generally between 50 DEG  and 200 DEG C., and the pressure usually below 50 atmospheres.  An inert liquid medium is preferably employed, e.g. a halogenated hydrocarbon such as carbon tetrachloride or a chlorofluoromethane.  When making the higher telomers of sulphur chloride pentafluoride and tetrafluoroethylene, it is convenient to use as solvent the liquid 1:1 adduct SF5.C2F4.Cl. Olefinic reactants specifie are ethylene, styrene, trifluoroethylene, tetrafluoroethylene and chlorotrifluoroethylene.  Suitable free-radical-producing compounds are inorganic peroxides, alkyl and aryl peroxides, acyl peroxides, peroxy-esters and azo-esters; benzoyl peroxide, di-tertiary-butyl peroxide and bispentafluorosulphur peroxide are specified.  In the examples (1) tetrafluoroethylene and (2) trifluoroethylene are reacted with sulphur chloride pentafluoride in the presence of benzoyl peroxide, and (3) tetrafluoroethylene is reacted with sulphur chloride pentafluoride in the presence of bispentafluorosulphur peroxide.  The 1:1 adducts and low molecular telomers are fractionally distilled; higher telomers are obtained as wax-like or liquid residues.  The Provisional Specification mentions that alkyl peroxydicarbonates are suitable as freeradical-producing compounds.  Specifications 877,961, 891,552, 898,309 and 906,448 are referred to.ALSO:1:1 and higher telomers and cotelomers of sulphur chloride pentafluoride with such olefines and halogen-substituted olefines as are themselves able to be homopolymerised by means of free-radical-producing catalysts are obtained by heating sulphur chloride pentafluoride with one or more of said olefines or halogen-substituted olefines at autogenous pressure in a closed vessel in the presence of an added free-radical-producing compound. The temperature is generally between 50 and 200 DEG C., and the pressure usually below 50 atmospheres.  An inert liquid medium is preferably employed, e.g. a halogenated hydrocarbon such as carbon tetrachloride or a chlorofluoromethane.  When making the higher telomers of sulphur chloride pentafluoride and tetrafluoroethylene, it is convenient to use as solvent the liquid 1:1 adduct SF5,C2F4,Cl. Olefinic reactants specified are ethylene, styrene, trifluoroethylene, tetrafluoroethylene and chlorotrifluoroethylene. Suitable free-radical-producing compounds are inorganic peroxides, alkyl and aryl peroxides, acyl peroxides, peroxy-esters and azo-esters; benzoyl peroxide; di-tertiarybutyl peroxide and bispentafluorosulphur peroxide are specified.  In the examples (1) tetrafluoroethylene and (2) trifluoroethylene are reacted with sulphur chloride pentafluoride in the presence of benzoyl peroxide, and (3) tetrafluoroethylene is reacted with sulphur chloride pentafluoride in the presence of bispentafluorosulphur peroxide.  The 1:1 adducts and low molecular telomers are fractionally distilled; higher telomers are obtained as wax-like or liquid residues.  The Provisional Specification mentions that alkyl peroxydicarbonates are suitable as free-radical-producing compounds.  Specifications 877,961, 891,552, 898,309 and 906,448 are referred to.