초록

High purity fluoropolymers are obtained by the emulsion polymerization process, removing essentially all ions and coagulating the polymer essentially without adding ions. These polymers are useful in the field of electronic devices.

대표청구항 ▼

1. A fluoropolymer obtained by a process comprising:(a) polymerizing one or more fluoromonomers by the aqueous emulsion polymerization process, (b) removing from the so-obtained latex essentially all ions different than NH4+, H+ and OH? by contacting the latex with cation and anion exchange resins a

1. A fluoropolymer obtained by a process comprising:(a) polymerizing one or more fluoromonomers by the aqueous emulsion polymerization process, (b) removing from the so-obtained latex essentially all ions different than NH4+, H+ and OH? by contacting the latex with cation and anion exchange resins and (c) coagulating the fluoropolymer essentially without addition of ions. 2. A fluoropolymer which is essentially free of extractable ions other than NH4+.3. An ultraclean emulsion polymerized fluoropolymer comprising interpolymerized units derived from one or more fluoroolefin monomers, said fluoropolymer being essentially free of ions other than NH4+, H+ and OH?.4. An ultraclean fluoropolymer according to claim 3 that contains less than 1000 parts per million of ions other than NH4+, H+ and OH?.5. An ultraclean fluoropolymer according to claim 3 that is essentially free from organic acid acceptors.6. An ultraclean fluoropolymer according to claim 3 that is a fluorothermoplastic.7. An ultraclean fluoropolymer according to claim 3 that is a curable fluoroelastomer.8. A curable fluoroelastomer according to claim 7 wherein the fluoropolymer contains interpolymerized units derived from a cure site monomer.9. A curable fluoroelastomer according to claim 8 wherein the cure site monomer is selected from bromine containing or nitrile containing cure site monomers.10. A peroxide-curable fluoroelastomer according to claim 9 wherein the cure site monomer is a bromine containing cure site monomer.11. A peroxide-curable fluoroelastomer according to claim 7.12. A peroxide-curable fluoroelastomer according to claim 11 further comprising an effective amount of a peroxide curative and, optionally, an effective amount of a coagent.13. A peroxide curable fluoroelastomer according to claim 12 that is essentially free of organic acid acceptors.14. A peroxide curable fluoroelastomer according to claim 12 further comprising a fluoropolymer filler.15. A curable fluoroelastomer according to claim 9 wherein the cure site monomer is a nitrile containing cure site monomer.16. A curable fluoroelastomer according to claim 15 further comprising an effective amount of an ammonia generating cure system and, optionally a fluoropolymer filler.