Composition and method for producing the same
A composition containing a polytetrafluoroethylene, a polymer (I) containing a polymerization unit (I) based on a monomer represented by the general formula (I), a nonionic surfactant, and an aqueous medium, wherein a content of the polytetrafluoroethylene in the composition is 10% by mass or more based on the composition, and a content of the nonionic surfactant in the composition is 1.0% by mass or more based on the polytetrafluoroethylene, CX 1 X 3 ═CX 2 R(—CZ 1 Z 2 -A 0 ) m (I) wherein X 1 and X 3 are each independently F, Cl, H, or CF 3 ; X 2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A 0 is an anionic group; R is a linking group; Z 1 and Z 2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.
1 . A composition comprising:
a polytetrafluoroethylene;
a polymer (I) containing a polymerization unit (I) based on a monomer represented by the general formula (I);
a nonionic surfactant; and
an aqueous medium,
wherein a content of the polytetrafluoroethylene in the composition is 10% by mass or more based on the composition,
a content of the nonionic surfactant in the composition is 1.0% by mass or more based on the polytetrafluoroethylene, and
a content of the polymerization unit (I) in the polymer (I) is 20 mol % or more based on all polymerization units,
CX 1 X 3 ═CX 2 R(—CZ 1 Z 2 -A 0 ) m (I)
wherein X 1 and X 3 are each independently F, CI, H, or CF 3 ; X 2 is H, F, or CF 3 ; A 0 is an anionic group; R is a linking group; Z 1 and Z 2 are each independently F or CF 3 ; and m is 1.
2 . The composition according to claim 1 , wherein a stability retention time as measured by mechanical stability test of the composition is 1.0 minutes or more.
3 . The composition according to claim 1 , wherein a content of the polytetrafluoroethylene in the composition is 40% by mass or more based on the composition.
4 . The composition according to claim 1 , wherein the nonionic surfactant is represented by the general formula (i):
R 6 —O-A 1 -H (i)
wherein R 6 is a linear or branched primary or secondary alkyl group having 8 to 18 carbon atoms, and A 1 is a polyoxyalkylene chain.
5 . The composition according to claim 1 , which is substantially free from a fluorine-containing surfactant.
6 . The composition according to claim 1 , wherein the polymer (I) has a weight average molecular weight of 2.0×10 4 or more.
7 . The composition according to claim 1 , wherein the polymer (I) has a weight average molecular weight of 15.0×10 4 or more.
8 . The composition according to claim 1 , wherein the polymer (I) has an ion-exchange capacity of 1.75 meg/g or more.
9 . The composition according to claim 1 , wherein the polymer (I) has an ion-exchange capacity of 2.60 meg/g or more.
10 . The composition according to claim 1 , wherein the polymer (I) is water-soluble.
11 . The composition according to claim 1 , wherein A° in the general formula (I) is —SO 3 M, —COOM, or —P(O)(OM) 2 , wherein M is H, a metal atom, NR 7 4 , imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent, and R 7 is H or an organic group.
12 . The composition according to claim 1 , wherein the polytetrafluoroethylene is a modified polytetrafluoroethylene containing a tetrafluoroethylene unit and a modifying monomer unit.
13 . The composition according to claim 12 , wherein the modifying monomer is at least one selected from the group consisting of hexafluoropropylene, chlorotrifluoroethylene, vinylidene fluoride, fluoro (alkyl vinyl ether), (perfluoroalkyl) ethylene, ethylene, and a modifying monomer having a functional group capable of reacting by radical polymerization and a hydrophilic group.