Modified fluororesin and process for producing the same

A process for producing a modified fluororesin, comprising the steps of:

• exposing a fluororesin heated at a temperature at or above the melting point of the resin in an inert gas atmosphere having an oxygen concentration of not more than 10 Torr to an ionizing radiation at a radiation dose of 0.1 kGy to 10 MGy to prepare a crosslinked fluororesin;
• exposing the crosslinked fluororesin to an ionizing radiation at a radiation dose of 10 kGy to 5 MGy;
• and then bringing the crosslinked fluororesin into contact with a functional group-containing organic compound to cause a graft reaction.

A process for producing a modified fluororesin, comprising the steps of:

• exposing a fluororesin heated at a temperature at or above the melting point of the resin in an inert gas atmosphere having an oxygen concentration of not more than 10 Torr to an ionizing radiation at a radiation dose of 0.1 kGy to 10 MGy to prepare a crosslinked fluororesin;
• and exposing the crosslinked fluororesin to an ionizing radiation at a radiation dose of 10 kGy to 5 MGy in the presence of a functional group-containing organic compound to cause a graft reaction.