摘要:
A polymer having a structure represented by general formula: (I) (wherein X, Y, and Z each is hydrogen, fluorine, chlorine, bromine, or iodine, provided that at least one of X, Y, and Z is fluorine; R is linear or branched fluoroalkylene optionally containing oxygen; x and y each represents mol% and x is 1 to 100 mol%; A is -CN, -NCO, -COOR' (R' is hydrogen or alkyl), an acid anhydride group, or an unsaturated hydrocarbon group; and M is a repeating unit derived from a copolymerizable monomer) is treated with a crosslinking agent selected among ammonia, a diamine, and a polyol to crosslink the polymer through pendant functional groups of the polymer. This method of crosslinking can be carried out at room temperature and gives a transparent fluororesin having excellent heat resistance as compared with conventional transparent thermoplastic resins.
摘要:
A process for producing a granular powder of modified polytetrafluoroethylene (PTFE) which is excellent in the handleability, i.e., flowability and apparent density of a powder without using an atomized powder and in the properties of moldings made therefrom, can be granulated with only water without using organic liquids, and can provide moldings having a breakdown voltage similar to the case wherein use is made of an atomized powder of an unmodified PTFE. The granular powder is produced by agitating in an aqueous medium a powder of a perfluorovinyl ether-modified PTFE produced by suspension polymerization and having an average grain diameter of 100 to 300 νm.
摘要:
A thermoplastic resin composition comprising (i) 5-80 wt. % of a polyamide resin, (ii) 15-90 wt. % of a fluororesin, and (iii) 1-80 wt. % of a fluororubber having a tensile modulus of 500 kg/cm2 or less at ordinary temperature. A molding having a layer formed from the above composition has an excellent chemical resistance.
摘要:
The invention provides ozone-resistant articles such as pipes and fittings for semiconductor equipment; molding materials suitable for the production of such ozone-resistant articles; ozone-resistant injection-molded articles; and injection molding materials. A molding material for the production of ozone-resistant articles which comprises a copolymer (A) and exhibits a melt flow rate of 0.1 to 50g/10min, characterized in that the copolymer (A) is a copolymer of tetrafluoroethylene and a perfluoro vinyl ether which contains at least 3.5 % by mass of perfluoro vinyl ether units and has a melting point of 295°C or above and a content of unstable terminals of 50 or below per 1 × 106 carbon atoms contained in the copolymer.
摘要:
An antireflection article, comprising an acrylic resin substrate and a fluoropolymer film provided on the surface of the substrate, wherein the film has a thickness of 0.03 to 0.5 mu m and the fluoropolymer has a refractive index of 1.30 to 1.40 and comprises a block compatible with an acrylic resin and a block of a fluoroelastomer. This article possesses scratch resistance and antireflection effect comparable with the conventional articles and, in addition, can be stably prepared at a low cost, or possesses an antireflection effect superior to that of the conventional antireflection film while maintaining the scratch resistance.
摘要:
A polytetrfluoroethylene fine powder which is obtainable by contacting a polytetrfluoroethylene fine powder having a standard specific gravity of 2.180 to 2.225 with a fluorine radical source and exhibits a standard specific gravity of 2.180 to 2.225, wherein a film which is cut from a formed product of the resulting fine powder, fired and then cooled at a rate of 5 to 50˚C/sec exhibits a tan δ at 12 GHz of 2.0 X 10-4 or less. The disclosed polytetrfluoroethylene fine powder exhibits excellent extrudability and can be used for producing a polytetrfluoroethylene formed article excellent in various electrical and mechanical characteristics in a high frequency region of 3 to 30 GHz, in particular, a PTFE formed article for high frequency insulation.
摘要:
A material for solid polyelectrolytes which comprises a polymer comprising two or more fluoropolymer segments differing in monomer composition, wherein at least one of the fluoropolymer segments has sulfonic acid type functional groups.
摘要:
A granular powder of filled PTFE which has a high apparent density, a small mean particle diameter and a sharp particle size distribution, is excellent in the fluidity in a powdery state and can give molded articles being excellent in tensile strength and elongation and having low surface roughness; and a process for the production thereof. Powdered PTFE is mixed with a filler in water in the presence of a surfactant in a slurry state, and the resulting mixture is agitated in the presence of an organic liquid forming a liquid-liquid interface together with water to thereby conduct granulation.
摘要:
A granulated powder of filled PTFE for molding which exhibits a high apparent density and a low quantity of electrification, is excellent in the fluidity in a powdery state, and can give molded articles not lowered in tensile strength and elongation and little suffering from discoloration due to surfactants; and a process for the production thereof. 100 parts by weight of a mixture comprising powdered PTFE and a filler is wetted with 30 to 60 parts by weight of an aqueous solution containing an anionic surfactant; in a concentration of 10 or more but less than 40 times the critical micelle concentration, and the resulting wet mixture is granulated by a mechanical force.
摘要:
A fine polytetrafluoroethylene powder excellent in fluidity in a powdery state, which is composed of fine particles (primary particles) having a mean particle diameter of 0.05 to 1 νm and has an apparent density of 0.52 to 0.70 g/ml, a standard specific gravity (SSG) of 2.14 to 2.23 and a secondary mean particle diameter of 100 to 1000 νm; an antidripping agent produced from this powder; a flame-retardant resin composition containing the powder; and an antidusting composition containing the powder.