Patent ID: 11964417
Assignee: CHEMOURS-MITSUI FLUOROPRODUCTS CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A melt processible fluororesin molded article, wherein an amount of eluted Ni ions in pg/cm2 and an amount of eluted Cr ions in pg/cm2 and an amount of eluted Mo ions in pg/cm2 in a test solution after eluting for 20 hours at 60° C. using 12% nitric acid, quantitatively analyzed by an induced coupled plasma mass analysis method, satisfy the following formula:

0.68≤1−[(M1+M2)/(M1+M2+M3)]<0.76,

wherein M1 refers to the eluted Cr ion amount in pg/cm2, M2 refers to the eluted Mo ion amount in pg/cm2, and M3 refers to the eluted Ni ion amount in pg/cm2, wherein the melt processible fluororesin molded article is formed from a melt processible fluororesin comprising a copolymer comprising tetrafluoroethylene and 2 to 8 mol % perfluoro(ethylvinyl ether), the melt processible fluororesin having a form selected from the group consisting of a pellet, a cube, and a bead prior to melt molding, wherein the melt processible fluororesin is melt molded to form the melt processible fluororesin molded article, wherein the amount of eluted Mo ions measured by the induced coupled plasma mass analysis method is 53 to 144 pg/cm3, the amount of eluted Cr ions measured by the induced coupled plasma mass analysis method is 149 to 838 pg/cm3, and the amount of eluted Ni ions measured by the induced coupled plasma mass analysis method is 627 to 3,014 pg/cm3, wherein the melt processible fluororesin molded article comprises fine particles measured by passing ultrapure water through an automatic measurement fine particle meter as specified in JIS K 0554 in an amount such that a total of 0 to 100 particles/mL are detected as measured by a fine particle in liquid measurement method as a sum of measurements for 1 hour, and wherein a zeta potential of a surface of the melt processible fluororesin molded article measured by a flow potential method is −50 mV or lower.