Method for preparation of tetrafluoroethylene/hexafluoropropylene copolymer
AssigneeDiakin Industries Ltd.
InventorsTomohisa Noda, Hiroyuki Honda, Chuzo Okuno
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Abstract
A method for preparing a tetrafluoroethylene/hexafluoropropylene copolymer by polymerizing tetrafluoroethylene and hexafluoropropylene in an aqueous medium using a di(fluoroacyl) peroxide as a polymerization initiator characterized in that a fluoroalkylcarboxylic acid is added gives a stable molecular weight of the tetrafluoroethylene/hexafluoropropylene copolymer and an increased utilization efficiency of the polymerization initiator.
Claims7
A method for preparing a tetrafluoroethylene/hexafluoropropylene copolymer by polymerizing tetrafluoroethylene and hexafluoropropylene in an aqueous medium using, as a polymerization initiator, a di(fluoroacyl) peroxide of the formula:
- ##STR3## wherein X.sup.1 and X.sup.2 each is a hydrogen, fluorine or chlorine atom, m is an integer of 4 to 8 when X.sup.1 is the hydrogen atom, and m is an integer of 3 to 8 when X.sup.1 is the fluorine or chlorine atom, and n is an integer of 4 to 8 when X.sup.2 is the hydrogen atom, and n is an integer of 3 to 8 when X.sup.2 is the fluorine or chlorine atom, characterized in that a fluoroalkylcarboxylic acid of the formula:
- ##STR4## wherein Y.sup.1 is a hydrogen, fluorine or chlorine atom, and p is an integer of 4 to 8 when Y.sup.1 is the hydrogen atom, and p is an integer of 3 to 8 when Y.sup.1 is the fluorine or chlorine atom, is added to a polymerization reaction before the initiation of the polymerization or during the polymerization.
Dependencies are inferred from the claim text.