Provided is a method for producing a fluoropolymer in the presence of a specific non-fluorinated compound having surface activity. The method shows a high polymerization rate, and suppresses formation of sticking polymerization materials after production of a polymer product. The method includes aqueous dispersion polymerization of a fluoroolefin in the presence of a compound (1) represented by formula (1): ##STR00001## wherein R.sup.1 and R.sup.2 are the same as or different from each other, and each represent a C4 to C12 non-fluorinated saturated hydrocarbon group; and M is an alkali metal, an ammonium salt, or an amine salt.

Provided is a method for producing a fluoropolymer in the presence of a specific non-fluorinated compound having surface activity. The method shows a high polymerization rate, and suppresses formation of sticking polymerization materials after production of a polymer product. The method includes aqueous dispersion polymerization of a fluoroolefin in the presence of a compound (1) represented by formula (1): ##STR00001## wherein R.sup.1 and R.sup.2 are the same as or different from each other, and each represent a C4 to C12 non-fluorinated saturated hydrocarbon group; and M is an alkali metal, an ammonium salt, or an amine salt.

Anionic surfactants have a formula: R.sub.fSO.sub.2N(H)CH.sub.2CH(CH.sub.3)OH; or R.sub.fSO.sub.2N(H)(CH.sub.2CH.sub.2O).sub.xH, where x is an integer from 2-6. R.sub.f is a fluoroalkyl group having 3 to 8 carbon atoms. Neutral surfactants having a formula: (a) R.sub.fSO.sub.2N[CH.sub.2CH(CH.sub.3)OH].sub.2; (b) R.sub.fSO.sub.2N[CH.sub.2CH(CH.sub.3)OH][(CH.sub.2CH.sub.2O).sub.nH], where n is an integer from 1-6; (c) R.sub.fSO.sub.2N(R)[(CH.sub.2CH.sub.2O).sub.pH], where p is an integer from 2-6, and R is an alkyl group having 1 to 4 carbon atoms; or (d) R.sub.fSO.sub.2N[(CH.sub.2CH.sub.2O).sub.qH][(CH.sub.2CH.sub.2O).sub.mH], where q is an integer from 1-6 and m is an integer from 3-6. R.sub.f is a fluoroalkyl group having 3 to 8 carbon atoms.

Anionic surfactants have a formula: R.sub.fSO.sub.2N(H)CH.sub.2CH(CH.sub.3)OH; or R.sub.fSO.sub.2N(H)(CH.sub.2CH.sub.2O).sub.xH, where x is an integer from 2-6. R.sub.f is a fluoroalkyl group having 3 to 8 carbon atoms. Neutral surfactants having a formula: (a) R.sub.fSO.sub.2N[CH.sub.2CH(CH.sub.3)OH].sub.2; (b) R.sub.fSO.sub.2N[CH.sub.2CH(CH.sub.3)OH][(CH.sub.2CH.sub.2O).sub.nH], where n is an integer from 1-6; (c) R.sub.fSO.sub.2N(R)[(CH.sub.2CH.sub.2O).sub.pH], where p is an integer from 2-6, and R is an alkyl group having 1 to 4 carbon atoms; or (d) R.sub.fSO.sub.2N[(CH.sub.2CH.sub.2O).sub.qH][(CH.sub.2CH.sub.2O).sub.mH], where q is an integer from 1-6 and m is an integer from 3-6. R.sub.f is a fluoroalkyl group having 3 to 8 carbon atoms.

Described herein is a method of making a fluoropolymer and fluoropolymers thereof, wherein the method comprises: (a) providing an aqueous solution comprising a water soluble polyiodide salt of Formula (I): M.sup.+y[II(I).sub.n].sub.y.sup. wherein M is a cation group having a valence y, y is an integer of at least 1 and n is an integer of at least 1; and (b) initiating polymerization of a monomer in the aqueous solution, wherein the monomer is a fluorinated monomer.

Described herein is a method of making a fluoropolymer and fluoropolymers thereof, wherein the method comprises: (a) providing an aqueous solution comprising a water soluble polyiodide salt of Formula (I): M.sup.+y[II(I).sub.n].sub.y.sup. wherein M is a cation group having a valence y, y is an integer of at least 1 and n is an integer of at least 1; and (b) initiating polymerization of a monomer in the aqueous solution, wherein the monomer is a fluorinated monomer.

A compound of formula CF.sub.2CFCF.sub.2OSF.sub.5 and polymers comprising recurring units deriving from CF.sub.2CFCF.sub.2OSF.sub.5 are disclosed as well as processes for their preparation.

A compound of formula CF.sub.2CFCF.sub.2OSF.sub.5 and polymers comprising recurring units deriving from CF.sub.2CFCF.sub.2OSF.sub.5 are disclosed as well as processes for their preparation.

Provided is a polymer comprising a repeating unit derived from a monomer (a) represented by general formula: R.sup.1R.sup.2(CH.sub.2).sub.pOR.sup.3 wherein R.sup.1 is CH.sub.3, CH.sub.2F, CHF.sub.2, CH.sub.2I, or CHFI, R.sup.2 is an alkylene group having 1 to 49 carbon atoms consisting of unit represented by CFH, an alkylene group having 2 to 49 carbon atoms consisting of unit represented by CFH and unit represented by CH.sub.2, or an alkylene group having 3 to 49 carbon atoms consisting of unit represented by CFH, unit represented by CH.sub.2, and unit represented by CHI, p is an integer of 0 to 2, and R.sup.3 is an organic residue having an ethylenically unsaturated polymerizable group.

A composition including a perfluoroelastomer and a polymer (1) having a number average molecular weight of 0.310.sup.4 or more and containing a polymerized unit (1) derived from a monomer represented by the following general formula (1):

CX.sub.2CY(CZ.sub.2ORf-A)(1)

where X, Y, Z, Rf, and A in the polymerized unit (1) are as defined herein, and where a content of the polymerized unit (1) in the polymer (1) is 90 mol % or more based on all polymerized units.