Tetrafluoroethylene/fluoroalkoxy trifluoroethylene copolymer composition
AssigneeDuPont-Mitsui Fluorochemicals Co., Ltd.
InventorsShinichi Namura, Takao Nishio
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Abstract
A tetrafluoroethylene/fluoroalkoxy trifluoroethylene copolymer (PFA) composition which has finer spherulite diameters compared to a conventional PFA is provided, so as to give fabricated articles having excellent surface smoothness, and which are free from problems, such as process contamination and the like, caused by leaching. This effect is obtained by incorporating into the composition prior to fabrication a polytetrafluoroethylene having a crystallization temperature of at least 305.degree. C. and a heat of crystallization of at least 50 J/g.
Claims5
A melt-formable composition consisting essentially of crystalline tetrafluoroethylene/fluoroalkoxy trifluoroethylene copolymer and polytetrafluoroethylene having a crystallization temperature of at least 305.degree. C. and a heat of crystallization of at least 50 J/g, said polytetrafluoroethylene being present in an amount of not more than 4% by weight based on the combined weight of said tetrafluoroethylene/fluoroalkoxy copolymer and polytetrafluoroethylene.
Dependencies are inferred from the claim text.