摘要:
Addition complexes of tertiary amines and boron trichloride of the general formula BCl.sub.3.NR.sub. 1 R.sub.2 R.sub. 3 are used as an accelerator system for a heat-curing reaction resin mixture of purified polyisocyanate and polyepoxy resin compounds. Insulation impregnated with this reaction resin mixture exhibits high thermal stability in the hardened condition and can be used at high operating temperatures.
摘要:
Novel cyclic monomers leaving two functional groups capable of undergoing condensation reactions to form amide, urea or urethane linkages and at least one photo or radiation-reactive group are condensed with cyclic comonomers to form a soluble, substantially-linear condensation pre-polymer. A solution of the prepolymer is applied to a substrate and the solution is evaporated off to form a film or foil. The photo or radiation-sensitive layer or foil is exposed or irradiated through a pattern, the unexposed or unirradiated part is dissolved or stripped off, and the relief structure which remains is annealed if necessary. The relief structures obtained are distinguished particularly by the sharpness of their edges, good mechanical and chemical properties as well as good insulating properties. They are suited particularly for the preparation of miniaturized insulating layers.
摘要:
In a method for the manufacture of formed elongated articles of cross-linked polyethylene in which the polyethylene is shaped in the non-cross-linked condition and is subsequently cross-linked by the application of heat in the presence of organic radical-forming agents, the improvement wherein 0.1 to 20% by weight of polyethylene of a cross-link promoting coagent selected from the group consisting of 2,4-dienoxy-6-amino-alkyl(ene)-s-triazines and N,N'-bis-(2,4-dienoxy-s-triazine-6)-diamines, is admixed with the polyethylene and is thereafter shaped and continuously cross-linked by application of heating at about atmospheric pressure and at a temperature above about 150.degree.C. and below the decomposition temperature of the components of the mixture.
摘要:
Molding compounds for encapsulating semiconductor components comprise filler-containing polyepoxy resins and a 1,3,5-tris(3-amino-4-alkylphenyl)-2,4,6-trioxohexahydrotriazine with a C.sub.1 to C.sub.4 alkyl radical as a hardener. The molding compounds are storage-stable and moldings manufactured therefrom meet the requirements for these materials.
摘要:
Molding materials, laminates, stratified material and cover or protective layers which are of high electrical and mechanical quality are formed from polymerisable epoxy compounds if the corss-linking of the epoxy resins is accomplished by anionic polymerisation, using mixed catalysts of tertiary amines of the formula: ##STR1## and an imidazoles of the formula: ##STR2## as a polymerisation catalysts.
摘要:
Prepregs can be prepared by impregnating reinforcement materials such as glass, carbon or plastic (in the form of fibers or nonwoven or woven materials) with a solution of a polyepoxy resin and a polyamine as a hardener and subsequent drying. For the manufacture of storage-stable prepregs based on polyepoxy resins, 1,3,5-tris(3-amino-4-alkylphenyl-2,4,6-trioxo-hexahydrotriazine with a C.sub.1 - to C.sub.4 alkyl radical is used as the hardener. The new method leads to storage-stable prepregs and assures that composite materials, especially circuit boards, manufactured therefrom meet the requirements for these materials.
摘要:
Electrically insulating composite materials formed from (1) epoxy resins and (2) polymeric fiber reinforcement which have high strength are formed if the cross-linking of the epoxy resin is accomplished by anionic polymerization using tertiary amines of the formula ##STR1## as catalyst.
摘要:
This application relates to methods for the manufacture of leakage current-proof epoxy-resin molded materials from epoxy resin mixture based on di- or polycarboxylic-acid glycidyl esters, di- or polyfunctional cycloaliphatic olefinic epoxides and dicarboxylic-acid anhydrides, carried out in such a manner that molded materials with good mechanical properties are obtained also for parts of large volume. For this purpose, the invention provides that, by means of the experimentally determined time necessary to reach the maximum temperature during the cross-linking of the epoxy resin mixture under quasi adiabatic conditions, the rate of cross-linking of the epoxy resin mixture is adjusted, by the addition of a diol or polyol, to at least as long as the time necessary to reach the maximum temperature during cross-linking of the glycidyl ester/dicarboxylic acid anhydride components.
摘要:
Glow polymerisate layers can be generated on a substrate, starting from hydrocarbons and/or fluorocarbons, by means of a high-frequency, low-pressure glow discharge. Glow polymerisates completely saturated with hydrogen or fluorine are obtained when the glow discharge is carried out in the microwave range between 0.5 and 1.000 GHz and if the amplitude E.sub.0 of the effective field strength in the vicinity of the substrate no greater than 850 V/cm.
摘要:
The invention provides a method for the preparation of relief structures of highly heat-resistant polymers, using radiation-sensitive, soluble preliminary polymers in the form of polyaddition or polycondensation products of polyfunctional carbocyclic or heterocyclic compounds containing radiation-sensitive radicals in ester groups bound to said compounds with diamines, diisocyanates, bis-acid chlorides or dicarboxylic acids of cyclic structure. According to the invention, the polyfunctional compounds containing the radiation-sensitive radicals contain, besides carboxyl, carboxylic acid chloride, amino, isocyanate or hydroxyl groups suitable for addition or condensation reactions, partly in ortho or periposition thereto, radiation-reactive radicals in the ester groups bound to the compounds having an oxyalkylene methacrylate or acrylate structure.