34 results about "1,1-Difluoroethylene" patented technology

The objective of the present invention is to provide: a vinylidene-fluoride-based copolymer having adhesiveness to metal foils that is superior to that of conventional vinylidene-fluoride-based copolymers; and an application of the vinylidene-fluoride-based copolymer. The vinylidene-fluoride-based copolymer is obtained by the copolymerization of vinylidene fluoride and the compound represented by formula (A). In formula (A): R1, R2, and R3 each independently is a hydrogen atom, a chlorine atom, or an alkyl group; and X is a heteroatom or a group of atoms that has a molecular weight of no greater than 500, contains a heteroatom, and has a primary chain configured from 1-20 atoms.

This invention relates to a process for the preparation of 1,1-difluoroolefins, e.g., difluorovinyl cycloaliphatic compounds such as difluorovinylcyclohexane and derivatives by the dehydrofluorination of a trifluoromethyl-substituted cycloaliphatic compound and the resulting compositions. This method utilizes a “sterically hindered super-base” system represented by the formula M+−NRR−; where M is Na or K and R is a secondary, or tertiary alkyl or cycloalkyl group of amines for effecting dehydrofluorination of the trifluoromethyl group leading to the difluorovinyl based cycloaliphatic compounds. The sterically hindered super base can be formed by the, in situ, reaction of a sodium or potassium alkoxide, e.g., KtBuO with a lithium dialkylamide where the lithium is bonded to nitrogen atom of an amine bearing secondary or tertiary aliphatic groups.

The invention provides a polyvinylidene fluoride resin (PVDF) film which has a crystal structure such that the [Beta]-crystal content is 10% or more relative to the sum total of [Alpha]-crystal and [Beta]-crystal as calculated from the absorbances observed in the infrared absorption spectrum and which preferably exhibits either a tensile modulus in TD of 90MPa or less at 120 DEG C or a ratio of (tensile modulus in TD at 100 DEG C) / (tensile modulus in TD at 23 DEG C) of 4% or less and is particularly preferably produced by extrusion molding; a multilayer film; a backsheet for a solar cell module, being provided with the film; and a film manufacturing process which comprises subjecting a sheet-shaped PVDF material obtained by melt extrusion to rapid cooling at 5 to 70 DEG C and, preferably, then heat treatment.

Disclosed is a polyvinylidene fluoride resin composition which contains a polyvinylidene fluoride resin and titanium oxide. The titanium oxide is contained in an amount of 5-100 parts by weight per 100 parts by weight of the polyvinylidene fluoride resin. The polyvinylidene fluoride resin composition also contains, as a heat stabilizer, at least one compound that is selected from the group consisting of polyhydroxy monocarboxylic acid calcium salts, aliphatic carboxylic acid calcium salts having 5-30 carbon atoms, calcium carbonate, calcium hydroxide, zinc oxide and magnesium oxide, in an amount of 0.1-20 parts by weight. The weight ratio of the titanium oxide to the heat stabilizer is from 100:1 to 3:1.

Provided is a vinylidene fluoride porous membrane characterized in that in a continuous area of thickness 10 [mu]m from one surface, as measured by a focused ion beam / scanning electron microscope, the mean diameter of netlike resin fibers is at most 100 nm and the porosity (A1) is at least 60%; also, the surface pore diameter (P1) at the aforementioned surface is at most 0.3 [mu]m. In addition to having a small surface pore diameter suitable for water filtration, the provided porous membrane comprises extremely thin netlike resin fibers and has a treated-water-side surface layer with extremely high porosity, thereby excelling at preventing particulate penetration and also being extremely reusable and resistant to contamination. The provided porous membrane is manufactured through a method wherein a melt-extruded membrane is obtained by adding a comparatively large amount of a polyester plasticizer which is compatible with a high-molecular-weight vinylidene fluoride resin and which, when kneaded together with the vinylidene fluoride resin, causes the crystallization temperature to be nearly equal to that of the vinylidene fluoride resin alone. After the melt-extruded membrane is preferentially cooled from one side and solidified, the plasticizer is extracted, the surface is partially wetted, and the membrane is stretched.

PURPOSE: A fluoride vinylidene-based copolymer with superior adhesive force with a substrate and uses of the copolymers are provided to enhance adhesive force with substrates and release strength of current collector and compound layer. CONSTITUTION: A fluoride vinylidene-based copolymer has 80-99.95 mol% of component represented by chemical formula a, 0-19.99 mol% of component represented by chemical formula b, and 0.01-20 mol% of component represented by chemical formula c. In the chemical formula b, RCOOH is an organic group containing carboxy group, R^1, R^2, and R^3 are respectively hydrogen, halogen, and carboxyl group or the derivative, or C1-5 alkyl group. In a general equation c, R_(N,S) is an organic radical containing one or more hetero atoms, R^4, R^5, and R^6 are respectively hydrogen, halogen, carboxyl group or the derivative, or C1-5 alkyl group.

The invention provides a method for making a 1,1-difluoroethylene polymer to obtain the 1,1-difluoroethylene polymer being high in bulk density without increasing auxiliary devices and the scale covering in a polymerization system. The method for making the 1,1-difluoroethylene polymer comprises that a monomer taking the 1,1-difluoroethylene polymer as the main content is dispersed in an aqueous medium containing suspension to be subjected to suspension polymerization. Therefore, the method is characterized in that the suspension polymerization is carried out under the existing of polyoxyethylene sorbitan fatty acid ester having a hydrophilic-lipophilic balance value (HLB) in the range of 1-8.

Disclosed is a vinylidene fluoride resin hollow fiber porous membrane characterized by comprising a vinylidene fluoride resin porous membrane in the form of hollow fibers, and having a ratio of the maximum pore diameter (Pmax) to the average pore diameter (Pm) (i.e., a Pmax / Pm ratio) of 2.0 or less as measured by a half-dry / bubble-point method (ASTM F316 and ASTM E1294), a Pm of 0.13 to 0.25 [mu]m, a coefficient of variation in pore diameter on the outer surface of 70% or less, and a porosity of 75 to 90%. In the hollow fiber porous membrane, the average pore diameter is proper, the pore diameter distribution on the whole and the outer surface is uniform, and the porosity is high. Therefore, the hollow fiber porous membrane has good permeability to pure water, as well as an ability to maintain good permeability during the continuous filtration of muddy water. The hollow fiber porous membrane can be produced by a process comprising melt-extruding a vinylidene fluoride resin together with a plasticizer and a good solvent for the vinylidene fluoride resin into follow fibers, cooling the resulting product, shaping the cooled material into a membrane, extracting the plasticizer and the good solvent from the membrane, and stretching the membrane at a temperature ranging from 80 to 95 DEG C, which is higher and limited compared with the temperatures employed in the conventional processes, without carrying out any heat treatment for crystallization.

Provided in the present invention is a vinylidene fluoride copolymer. Same is acquired via a polymerization reaction taking place at conditions of 30-100° C. and 2-7 MPa with vinylidene fluoride, tetrafluoroethylene, and perfluorinated dioxole or C1-4 alkoxy-substituted perfluorinated dioxole as raw materials, with an initiator added into an emulsion consisting of water, fluorinated emulsifier, a chain transfer agent, a pH regulator, and an antifouling agent, and then via steps of separation, purification, refinement, condensation, washing, drying, and granulation, where the molar ratio of vinylidene fluoride, tetrafluoroethylene, and perfluorinated dioxole or C1-4 alkoxy-substituted perfluorinated dioxole is 13-17:2-4:1-3. The vinylidene fluoride copolymer of the present invention provides excellent transparency, flexibility, and solubility, is widely applicable in optical apparatus such as lenses, and is for use in specialty films in the fields of solar panels and of capacitors as a fuel cell membrane, a transparent and tough coating, and a large-sized blown object.