| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to a method for producing a melt-moldable tetrafluoroethylene copolymer. A method for producing a melt-moldable TFE copolymer, characterized by radical suspension-polymerizing TFE and another fluoromonomer in an aqueous medium in the presence of a radical polymerization initiator and at least one chain transfer agent selected from the group consisting of methane, ethane, a hydrochlorocarbon, a hydrofluorocarbon and a hydrochlorofluorocarbon, in the presence of the radical polymerization initiator and the chain transfer agent and in addition, in the presence of from 3 to 5 ppm of a fluoroemulsifier based on the mass of the aqueous medium, all the above fluoro-containing monomer charged and used in the polymeric system in the course of lopymerization initiation was 1 to 6 mass percent calculate as the amount to produce a TFE copolymer comprising repeating units (a) based on TFE and repeating units (b) based on another fluoromonomer, wherein the amount of the repeating units (a) is from 97.4 to 99.5 mass % based on the total mass of the repeating units (a) and the repeating units (b), wherein the melting point of the tetrafluoroethylene copolymer is from 320 to 335C and the volume flow rate is from 0.1 to 1,000 mm3/s. ^ EFFECT: melt-moldable TFE copolymer can be produced at an excellent polymerization rate, which has a high melting point and excellent mechanical properties such as tensile strength and is free from coloration. ^ 9 cl, 17 ex, 4 tbl |
