A modified polytetrafluoroethylene aqueous dispersion having low viscosity at high temperature. The modified polytetrafluoroethylene aqueous dispersion contains a modified polytetrafluoroethylene and a nonionic surfactant, has a modified polytetrafluoroethylene solid concentration of 50 to 70% by mass, is substantially free from a fluorine-containing surfactant, and has a viscosity at 55° C. of 80 mPa•s or lower, and the modified polytetrafluoroethylene contains 0.050% by mass or more and 1.00% by mass or less of a polymerized unit based on a modifying monomer.

A modified polytetrafluoroethylene aqueous dispersion having low viscosity at high temperature. The modified polytetrafluoroethylene aqueous dispersion contains a modified polytetrafluoroethylene and a nonionic surfactant, has a modified polytetrafluoroethylene solid concentration of 50 to 70% by mass, is substantially free from a fluorine-containing surfactant, and has a viscosity at 55° C. of 80 mPa•s or lower, and the modified polytetrafluoroethylene contains 0.050% by mass or more and 1.00% by mass or less of a polymerized unit based on a modifying monomer.

The invention relates to an organic peroxide emulsion containing at least one organic peroxide, at least one emulsifier comprising at least one nonionic surfactant including at least one fatty chain and/or a protective colloid agent, a combination of two or more antigels containing no more than 9.5 wt% of a first antifreeze relative to the total weight of the ethanol emulsion, at least a second antifreeze and water. The invention also relates to a method for preparing such an emulsion, the use of such an emulsion for the polymerization or copolymerization of one or more ethylenically unsaturated monomers, and a halogenated vinyl polymer obtained by the use of such an emulsion.

A dispersion stabilizer for suspension polymerization is provided that includes a vinyl alcohol-based polymer (A), wherein a 0.1 mass % concentration aqueous solution of the polymer (A) has an absorbance (a1) of less than 0.25 at a wavelength of 280 nm, the aqueous solution has an absorbance (a2) of less than 0.030 at a wavelength of 320 nm, the polymer (A) has a degree of saponification of not less than 68 mol % and not more than 98 mol %, the polymer (A) has a viscosity-average degree of polymerization of more than 1500 and less than 4500, and the polymer (A) in powder form has a YI value of not less than 5. The dispersion stabilizer is capable of producing a vinyl-based resin that is excellent in polymerization stability, has a small particle size, and has an improved bulk density.

The invention relates to an organic peroxide emulsion comprising at least one organic peroxide comprising di-sec-butyl peroxydicarbonate, at least one emulsifier, at least one antifreeze, and water; said emulsion being free of methanol and ethanol.

The invention also relates to a process for preparing such an emulsion, to the use of such an emulsion for the polymerization or copolymerization of one or more ethylenically unsaturated monomers, and also to a halogenated vinyl polymer obtained by using such an emulsion.

The invention relates to an organic peroxide emulsion comprising at least one organic peroxide comprising di-sec-butyl peroxydicarbonate, at least one emulsifier, at least one antifreeze, and water; said emulsion being free of methanol and ethanol.

The invention also relates to a process for preparing such an emulsion, to the use of such an emulsion for the polymerization or copolymerization of one or more ethylenically unsaturated monomers, and also to a halogenated vinyl polymer obtained by using such an emulsion.

Tetrafluoroethene-based fluoropolymers of low gel content, methods of making the fluoropolymers, methods of extruding the fluoropolymers into articles, and extruded articles comprising the fluoropolymers.

Tetrafluoroethene-based fluoropolymers of low gel content, methods of making the fluoropolymers, methods of extruding the fluoropolymers into articles, and extruded articles comprising the fluoropolymers.

Provided is an aqueous dispersion composition that comprises a carboxyl-group-containing water-soluble copolymer in a relatively high concentration, but has intact handleability. More specifically, provided is, for example, an aqueous dispersion composition comprising 4 to 8 mass % of a copolymer obtained by polymerization in the presence of a nonionic surfactant with one or more polyoxyethylene chains, the copolymer being at least one member selected from the group consisting of

(1) copolymers obtained by polymerizing the following (i) and (ii),
(2) copolymers obtained by polymerizing the following (i) and (iii), and
(3) copolymers obtained by polymerizing the following (i), (ii), and (iii):
(i) 100 parts by mass of a (meth)acrylic acid;
(ii) 0.001 to 1 part by mass of a compound with two or more ethylenically unsaturated groups; and
(iii) 0.5 to 5 parts by mass of a (meth)acrylic acid alkyl ester having an alkyl group with 10 to 30 carbon atoms.

The invention relates to a method for preparation of a polymer from monomers comprising polyvinylidene fluoride, trifluoroethylene and a third monomer, the method successively comprising: injection of all the monomers to react into a reactor; initiation of a polymerization of the monomers; a continuation step (a) of the polymerization of the monomers, during which a drop in pressure in the reactor is compensated.