摘要:
Provided is a copolymer consisting essentially of ethylene units, tetrafluoroethylene units, and hexafluoropropylene units, wherein a molar ratio (Et units/TFE units) of the ethylene (Et) units to the tetrafluoroethylene (TFE) units is 52.0/48.0 to 56.0/44.0, and a content of the hexafluoropropylene units is 19.0 to 21.0 mol% based on the total monomer units constituting the copolymer.
摘要:
The invention aims to provide a novel method for producing a fluoropolymer. The method for producing a fluoropolymer of the invention includes polymerizing a fluoromonomer in an aqueous medium in the presence of a surfactant to provide a fluoropolymer. The surfactant includes at least one selected from the group consisting of a surfactant represented by R 1a -CO-R 2a -CO-R 3a -OSO 3 X a and a surfactant represented by R 1b -CO-(CR 2b 2 ) n -(OR 3b ) p -(CR 4b 2 ) q -L-OSO 3 X b .
摘要:
The invention aims to provide a novel method for producing a fluoropolymer. The method for producing a fluoropolymer of the invention includes polymerizing a fluoromonomer in an aqueous medium in the presence of a surfactant to provide a fluoropolymer. The surfactant includes at least one selected from the group consisting of a surfactant represented by R 1a -CO-R 2a -CO-R 3a -A a and a surfactant represented by R 1b -CO-(CR 2b 2 ) n -(OR 3b ) p -(CR 4b 2 ) q -L-A b .
摘要:
The invention provides a novel sulfuric acid ester containing a plurality of carbonyl groups or a salt thereof, and a surfactant. The sulfuric acid ester is a compound represented by the following formula:
R 1 -C(=O)-R 2 -C(=O)-R 3 -OSO 3 X
wherein R 1 is a linear or branched alkyl group containing one or more carbon atoms or a cyclic alkyl group containing three or more carbon atoms, with a hydrogen atom that binds to a carbon atom being optionally replaced by a hydroxy group or a monovalent organic group containing an ester bond, the alkyl group optionally containing a carbonyl group when containing two or more carbon atoms, and the alkyl group optionally containing a monovalent or divalent heterocycle or being optionally in a cyclized form when containing three or more carbon atoms; R 2 and R 3 are each individually a single bond or a divalent linking group; R 1 , R 2 , and R 3 contain six or more carbon atoms in total; X is H, a metal atom, NR 4 4 , imidazolium optionally containing a substituent, pyridinium optionally containing a substituent, or phosphonium optionally containing a substituent, where R 4 s are each H or an organic group and are the same as or different from each other; and any two of R 1 , R 2 , and R 3 optionally bind to each other to form a ring.
摘要:
The present invention provides a composition including a fluorine-containing polymer, and excellent in heat resistance even if only a small amount of additives is added to the composition. The present invention relates to a composition, comprising: a fluorine-containing polymer (a) and a cobalt compound (b).
摘要:
Provided is a tube comprising a tetrafluoroethylene/fluoroalkyl vinyl ether copolymer, wherein the tube inner surface has a surface roughness Ra of 5 nm or less measured by atomic force microscopy (AFM) with an evaluation length set to 3 µm, and the tube has an amount of metals eluted from the tube inner surface of 0.30 ng/cm 2 or less.
摘要:
The invention provides a binder for a secondary battery leading to an excellently high density of an electrode, excellent adhesiveness to a current collector, excellent flexibility of an electrode, and excellent viscosity retention of slurry. The binder for a secondary battery contains a fluorine-containing polymer (A) and polyvinylidene fluoride (B). The fluorine-containing polymer (A) contains a polymerized unit based on vinylidene fluoride, a polymerized unit based on tetrafluoroethylene, and a polymerized unit based on a monomer (2-2) represented by the following formula (2-2):
wherein R 5 , R 6 , and R 7 are each independently a hydrogen atom or a C1-C8 hydrocarbon group; R 8 is a C1-C8 hydrocarbon group; and Y 1 is an inorganic cation or an organic cation.
摘要:
The present invention provides a fluorine-containing elastomer composition of which viscosity can be decreased without increasing an amount of expensive monomer while maintaining physical properties in normal state of a branched fluorine-containing elastomer. The composition is a peroxide-crosslinkable fluorine-containing elastomer composition comprising (A) a branched fluorine-containing elastomer having peroxide-crosslinkable cure site, which has a number average molecular weight of from 1,000 to 300,000 and a Mark-Houwink gradient "a" of less than 0.6 when an absolute weight molecular weight and an intrinsic viscosity are plotted on a Mark-Houwink plot having an axis of abscissa of absolute weight molecular weight and an axis of ordinate of intrinsic viscosity, and (B) a straight chain type fluorine-containing polymer having a number average molecular weight of from 1,000 to 250,000 and a Mark-Houwink gradient "a" of not less than 0.6.
摘要:
The present invention provides a welded body having a connecting structure formed by welding a first molded body and a second molded body, wherein the first and second molded bodies contain at least one copolymer selected from the group consisting of a tetrafluoroethylene/fluoro(alkyl vinyl ether) copolymer and a tetrafluoroethylene/hexafluoropropylene copolymer, and wherein the connecting structure has a liquid contact surface to be in contact with a liquid having a solubility parameter of 14 to 35 (MPa) 1/2 , a welded part formed in the connecting structure is not exposed to the liquid contact surface, and the number of particles of 30 nm or larger to be eluted from the liquid contact surface in the connecting structure is 1,000 particles/ml or less.