摘要:
The invention relates to a cosmetic composition that contains one or more compounds of the β-(1,3)-glucuronane or β-(1,3)-glucoglucuronane type as well as the pharmaceutically acceptable salt thereof, and to the use of this composition and these compounds for various cosmetic applications.
摘要:
A solvent-free epoxy resin matrix composition comprising: (a) a liquid epoxy resin or a liquid mixture of epoxy resins, (b) a benzylidenamine compound, (c) an aliphatic or cycloaliphatic primary monoamine and/or disecondary diamine; and (d) a catalytically curing tertiary amine. The epoxy resin matrix composition is used as an impregnating resin to form impregnated fiber composite materials.
摘要:
The present invention relates to a process for obtaining PAI fibres by spinning PAI in solution and to the fibres thus obtained. They are obtained by dry or wet spinning into dimethylalkyleneurea followed by removal of the solvent and overdrawing at high temperature. The yarns and fibres obtained are produced from PAI based on tolylene or meta-phenylene diisocyanate, and on an aromatic acid anhydride and/or an aromatic dianhydride, and optionally on one or a number of diacid compounds. They exhibit an outstanding thermomechanical behavior and make it possible to gain access to very low linear densities.
摘要:
The present invention relates to impregnating solutions consisting:of an active principle A+B in which: A denotes at least one thermoplastic poly(imide-amide) oligomer functionalized at the chain ends with an alkenyloxy, maleimido or nadimido group, B denotes a coreactant chosen from: B1=an imide ingredient, B2=an acrylate ingredient, B3=an alkenylphenol ingredient, B4=a novolac resin, B5=a vinyl ingredient, B6=an epoxy resin, B7=an amino ingredient and B8=a mixture of a number of ingredients B1 to B7;and of one or a number of aprotic polar solvent(s), the concentration of the active principle in the solution being between 2 and 80% by weight.These solutions are employed especially for the production of preimpregnated intermediate articles.
摘要:
Novel thermally stable bisimido/allylaniline polymers and prepolymers, well adopted for the production of prepregs and reinforced and impregnated composite shaped articles, comprise the copolymerizates of (a) at least one N,N'-bisimide, with (b) at least one hindered p-allylaniline, optionally in the presence of (c) an organic peroxide, azobisisobutyronitrile or an imidazole, (d) a vinylpyridine, N-vinylpyrrolidone, allyl isocyanurate, vinyltetrahydrofuran, or mixture thereof, (e) at least one diprimary diamine, and/or (f) an unhalogenated or chlorinated/brominated epoxy resin or N,N'-alkylenebistetrahalophthalimide, or particular (meth)acrylate or alkenylphenol.
摘要:
The present invention relates to a process for obtaining semiordered polyamides-imides.More particularly it consists in performing the polycondensation in two separate stages:1) reaction between a part of an aromatic diisocyanate and all of the trimellitic anhydride in the presence of dimethylalkyleneurea of pH.ltoreq.7 until the intermediate compound has dissolved,2) successive addition of one or more aromatic diacids and of the remainder of the diisocyanate in the dimethylalkyleneurea of pH.ltoreq.7 until the polyamide-imide obtained has dissolved completely.The semiordered polymers thus obtained have a Tg lower than the random polymers, and this makes them easier to convert.
摘要:
Novel low melt viscosity imido prepolymers, well adapted for the production of prepregs and filament wound shaped articles, are prepared by copolymerizing (a) at least one N,N'-bismaleimide with (b) at least one siloxane bismaleimide, (c) at least one aromatic diprimary diamine, (d) optionally, at least one olefinically unsaturated comonomer other than a bisimide, (e) optionally, a catalyst, and (f) either an acrylate or an unhalogenated epoxy resin.
摘要:
The invention relates to a cosmetic composition that contains one or more compounds of the β-(1,3)-glucuronane or β-(1,3)-glucoglucuronane type as well as the pharmaceutically acceptable salt thereof, and to the use of this composition and these compounds for various cosmetic applications.
摘要:
Directly shapeable clear solutions of polyamide imides and a method for preparing same are provided. The solutions are obtained by polycondensation in .gamma.-butyrolactone (.gamma.BL) in substantially stoichiometric proportions between toluylene diisocyanate and an aromatic acid anhydride, and by dilution in (.gamma.BL) to give a solution allowing them to be processed at a later stage. Yarns and fibers made from said solutions are also described.