申请人:Asahi Glass Company, Limited
公开号:EP2058341A1
公开(公告)日:2009-05-13
To provide a method for producing a tetrafluoroethylene copolymer, wherein the polymerization rate is excellent, the copolymer to be obtained is excellent in mechanical properties such as the tensile strength, it is free from coloration and can be melt-molded.
A method for producing a melt-moldable tetrafluoroethylene copolymer comprising repeating units (a) based on tetrafluoroethylene and repeating units (b) based on another fluoromonomer, wherein based on the total mass of the repeating units (a) and the repeating units (b), the amount of the repeating units (a) is from 97.3 to 99.5 mass%, and the volume flow rate is from 0.1 to 1000 mm3/s, characterized by radical suspension-polymerizing tetrafluoroethylene and the 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.
提供一种生产四氟乙烯共聚物的方法,在该方法中,聚合速率优异,获得的共聚物具有优异的机械性能,如拉伸强度,无着色,可熔融成型。
一种生产可熔融模塑的四氟乙烯共聚物的方法,该共聚物由基于四氟乙烯的重复单元 (a) 和基于另一种氟单体的重复单元 (b) 组成,其中基于重复单元 (a) 和重复单元 (b) 的总质量,重复单元 (a) 的量为 97.3 至 99.5 质量%,体积流速为 0.1 至 1000 mm3/s,其特征是在水介质中,在自由基聚合引发剂和至少一种选自甲烷、乙烷、 氯烃、氢氟碳化合物和氢氯氟碳化合物组成的组中的链转移剂的存在下,使四氟乙烯和氟onomer 进行自由基悬浮聚合。