Method for manufacturing perfluoroelastomer aqueous dispersion, composition, crosslinkable composition, and crosslinked product
AssigneeDaikin Industries, Ltd.
InventorsSoushi Tsuchiya, Masaki Irie, Takuma Iwasaka, Rina Tamai
Life of this patent
Estimating the term…
Abstract
The present disclosure provides a method for producing a perfluoroelastomer aqueous dispersion by polymerizing a perfluoromonomer in the presence of a polymer (1) and an aqueous medium to produce an aqueous dispersion of a perfluoroelastomer, the polymer (1) containing a polymerization unit (1) based on a monomer (1) represented by a general formula (1) and the polymer (1) having an ion exchange capacity of 1.50 meq/g or more.
Claims24
A method for producing a perfluoroelastomer aqueous dispersion by polymerizing a perfluoromonomer in the presence of a polymer (1) and an aqueous medium to produce an aqueous dispersion of a perfluoroelastomer, the polymer (1) containing a polymerization unit (1) based on a monomer (1) represented by a general formula (1) and the polymer (1) having an ion exchange capacity of 1.50 meq/g or more:
- CF2—CF—R—CZ1Z2-A0 (1)
- wherein R is a linking group;
- Z1 and Z2 are each independently F or CF3;
- and A0 is an anionic group,
- wherein the perfluoroelastomer is a fluoropolymer having a perfluoromonomer unit content of 90 mol % or more based on all polymerization units, a glass transition temperature of 20° C. or lower, a melting peak (AH) of 4.5 J/g or lower, and a fluorine atom concentration in the fluoropolymer of 71% by mass or more.
A composition comprising a perfluoroelastomer and a polymer (1) containing a polymerization unit (1) based on a monomer (1) represented by a general formula (1) and having an ion exchange capacity of 1.50 meq/g or more:
- CF2=CF—R—CZ1Z2-A0 (1)
- wherein R is a linking group;
- Z1 and Z2 are each independently F or CF3;
- and A0 is an anionic group,
- wherein the perfluoroelastomer is a fluoropolymer having a perfluoromonomer unit content of 90 mol % or more based on all polymerization units, a glass transition temperature of 20° C. or lower, a melting peak (AH) of 4.5 J/g or lower, and a fluorine atom concentration in the fluoropolymer of 71% by mass or more.
Dependencies are inferred from the claim text.