摘要:
A polymeric dielectric material comprising a terpolymer which comprises 30 to 90% by mole of VdF, 5 to 70% by mole of TrFE and 0.1 to 20% by mole of HFP, having large permittivity, which is improved by heat treatment.
摘要:
A polymeric dielectric having an outstanding dielectric constant, which essentially consists of a copolymer of vinylidene fluoride and triflouroethylene in a molar ratio of from about 95:5 to 10:90, preferably of from about 85:15 to 20:80, more preferably of from about 75:25 to 35:65.
摘要:
a fluorine-containing block copolymer comprising at least one soft segment which comprises chlorotrifluoroethylene and vinylidene fluoride and at least one hard segment which comprises a fluorine-containing crystalline polymer, which copolymer has good flexibility and transparency and useful as a material for an artificial lens.
摘要:
A denture base at least a part of which comprises a thermoplastic fluoroelastomer exhibits excellent characteristics as a denture base and particularly as a relining material for a denture base.
摘要:
It is an object of the present invention to provide a liquid composition which comprises an acid/acid salt group-containing polymer and from which cured articles excellent in mechanical characteristics and undergoing only slight dimensional changes depending on the moisture content can be produced by application thereof to a substrate or impregnation of a porous material therewith. The present invention relates to a fluoropolymer liquid composition comprising a fluoropolymer liquid (A) which comprises a liquid medium and a crosslinkable functional group-containing crosslinkable fluoropolymer, wherein said fluoropolymer liquid (A) is a fluoropolymer liquid dispersion (AD) having, dispersed in a liquid dispersion medium, particles of a crosslinkable fluoropolymer (PD) containing acid/acid salt groups or organic groups capable of undergoing hydrolysis and thus being converted to carboxyl groups, or a fluoropolymer solution (AS) having, dissolved in a fluorosolvent or an alcohol/water mixed solvent, a crosslinkable fluoropolymer (PS) containing acid/acid salt groups or acid/acid salt groups precursors; said acid/acid salt groups are sulfonic acid groups, carboxyl groups or groups of the formula —SO2NR2R3, —SO3NR4R5R6R7, —SO3M11/L, —COONR8R9R10R11 or —COOM21/L, wherein R2 represents a hydrogen atom or M51/L, R3 represents an alkyl group or an sulfonyl-containing group, R4, R5, R6, R7, R8, R9, R10 and R11 are the same or different and each represents a hydrogen atom or an alkyl group, and M1, M2 and M5 each represents a metal having a valence of L, said metal having a valence of L being a metal belonging to the group 1, 2, 4, 8, 11, 12 or 13 of the periodic table; and said acid/acid salt groups precursors are —SO2F, —SO2NR22R23 (wherein R22 and R23 are the same or different and each represents an alkyl group) or organic groups capable of undergoing hydrolysis and thus being converted to carboxyl groups.
摘要:
A fluorine-containing elastomeric copolymer which comprises units of at least one fluorovinyl ether of the formula: ##STR1## wherein X is C.sub.1 -C.sub.3 perfluoroalkyl, C.sub.1 -C.sub.3 .omega.-hydroperfluoroalkyl or C.sub.1 -C.sub.3 .omega.-chloroperfluoroalkyl, Y is hydrogen, chlorine, fluorine, trifluoromethyl, difluoromethyl or chlorodifluoromethyl and n is an integer of 1 to 4 and units of at least one other fluorine-containing monomer copolymerizable therewith, the content of the fluorovinyl ether units being 15 to 50 mol %, which has excellent resistance to low temperatures.
摘要:
A polymer of the formula:PC--[CH.sub.2 CYI--(CH.sub.2).sub.n --SiR.sub.x X.sub.3-x].sub.m (I)wherein PC is a polymer chain, X is a monovalent functional group, Y is a hydrogen atom or a lower alkyl group, R is a hydrogen atom or an inactive monovalent organic group, X is an integer of 0 to 3, m is a positive integer which is not larger than the number of ends of the polymer chain PC, and n is 0, 1 or 2, having a molecular weight of 5.times.10.sup.2 to 5.times.10.sup.6, which is relatively stable and easily handled.
摘要:
A co-crosslinkable blend composition which comprises (1) an iodine-containing fluoroelastomer, (2) at least one of silicone oligomers, silicone elastomers, fluorosilicone elastomers, phosphonitrilic fluoroelastomers, tetrafluoroethylene/propylene copolymers and hexafluoropropylene/ethylene copolymers and (3) an organic peroxide.
摘要:
A segmented polymer comprising a sequence of two or more polymer segments, an iodine atom liberated from an iodinated compound bonded at a terminal position of said sequence and a fragment of the iodinated compound from which at least one iodine atom has been removed bonded at another terminal position of said sequence, whereby said sequence intervenes between said iodine atom and said fragment, wherein adjacent polymer segments are different in steric configuration or monomeric composition, at least one of said polymer segments containing fluorine and each polymer segment having a molecular weight of not less than 10,000 but at least one polymer segment having a molecular weight of not less than 30,000. The polymer may contain additional moieties which originate from the monomers which constitute the polymer segments and from the iodinated compound, when the latter has a polymerizable double bond. The segmented polymers are prepared in a sequence of steps involving radical polymerization.
摘要:
Ion exchanger comprising a water-insoluble copolymer prepared by post-polymerizing at least one fluoroolefin monomer to a perfluorovinylacetic acid-vinylidene fluoride copolymer containing not less than 25% by mole of the perfluorovinylacetic acid unit in an aqueous solution of said copolymer in the presence of an organic or inorganic peroxide. The ion exchanger has excellent heat and chemical resistances and dimensional stability.