Thermoplastic polymer composition and process for preparing thermoplastic polymer composition

A molded article comprising a thermoplastic polymer composition which comprises a fluororesin (A) comprising a fluorine-containing ethylenic polymer (a) and a crosslinked fluororubber (B) comprising a fluororubber (b) that has been at least partially crosslinked, wherein:

• the fluorine-containing ethylenic polymer (a) comprises (a-1) a copolymer of tetrafluoroethylene and ethylene,
• the at least partially crosslinked fluororubber (b) is at least one kind of rubber selected from the group consisting of a vinylidene fluoride/hexafluoropropylene fluororubber, and a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene fluororubber,
• when the fluororubber (b) is the vinylidene fluoride/hexafluoropropylene fluororubber, a weight ratio of the fluororesin (A) to the crosslinked fluororubber (B) is 85/15 to 70/30, and when the fluororubber (b) is the vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene fluororubber, a weight ratio of the fluororesin (A) to the crosslinked fluororubber (B) is 85/15 to 60/40,
• a fuel permeation coefficient of the molded article is not more than 20 g·mm/m2·day, and
• a tensile modulus of elasticity of the molded article is not more than 400 MPa.