Modified polytetrafluoroethylene fine powder and modified polytetrafluoroethylene molded product

A method of producing a modified tetrafluoroethylene polymer which comprises:

• (1) a step of feeding tetrafluoroethylene and at least one species selected from the group consisting of a fluoro(alkyl vinyl ether) represented by the general formula (I):
• F2C═CFO(CF2)n1X1 (I)
• (wherein X1 represents a hydrogen atom or a fluorine atom and n1 represents an integer of 1 to 6), a vinylic heterocyclic compound represented by the general formula (II):
• (wherein X2 and X3 are the same or different and each represents a hydrogen atom or a fluorine atom and Y represents —CR1R2— in which R1 and R2 are the same or different and each represents a fluorine atom, an alkyl group containing 1 to 6 carbon atoms or a fluoroalkyl group containing 1 to 6 carbon atoms) and a fluoroolefin represented by the general formula (III):
• CX4X5═CX6(CF2)n2F (III)
• (wherein X4, X5 and X6 each represents a hydrogen atom or a fluorine atom provided that at least one of X4, X5 and X6 represents a fluorine atom;
• and n2 represents an integer of 1 to 5) to a reaction system and carrying out a polymerization reaction, and
• (2) a step of introducing tetrafluoroethylene and a chain transfer agent and a fluoro(alkyl vinyl ether) represented by the general formula (I) or a fluoroolefin represented by the general formula (III) into the reaction system and carrying out a polymerization reaction following the step (1),
• wherein the chain transfer agent comprises water-soluble alcohols containing 1 to 4 carbon atoms.