摘要:
A curable composition comprising an epoxy resin and an aromatic azopolyamine curing agent is described. The use of azopolyamine curing agents in reactive monomer-diluted systems results in a high-modulus cured epoxy system.
摘要:
According to the application, a relatively low molecular weight epoxy resin is reacted with an acidic fusion compound in the presence of a bis(trihydrocarbylphosphine)iminium salt catalyst to produce a high molecular weight fused epoxy resin. The process is particularly useful in reacting an epoxy resin having a molecular weight of less than 500 with 2,2-bis(4-hydroxyphenyl)propane in the presence of a bis(trihydrocarbylphosphine)iminium halide to produce a fused epoxy resin having a molecular weight within the range of 500 to 7000. The catalyst is relatively water-insensitive, and the reaction can therefore be carried out in the presence of water.
摘要:
Heat-curable compositions exhibiting improved room temperature pot life and reduced viscosity are obtained from composition comprising a polyepoxide, an aromatic or aliphatic amine, a trihydrocarbyl sulphonium salt, a free radical curing agent and an unsaturated monomer selected from vinylaromatic monomers, alkylesters of unsaturated carboxylic acids, cyano-compounds, vinyl-ester, N-vinylames and allyl compounds.
摘要:
A composition comprising a curable epoxy resin, a reactive diluent, a curing agent for the epoxy resin, and an isocyanate compound which is stable at room temperature for extended periods of time and cures to form a part which has good high-temperature properties.
摘要:
Heat-curable compositions exhibiting improved thermal pot life are obtained from epoxy compositions comprising (1) a polyepoxide, (2) an aromatic or aliphatic amine and (3) a catalytic amount of a trihydrocarbyl sulphonium salt.
摘要:
A thermosettable composition useful for electrical laminates is provided, comprising a tetrafunctional epoxy resin, a phenol novolac curing agent, a urea catalyst, a di- or tri-functional halogenated epoxy resin and a halogenated bisphenol. The composition is soluble in ketone solvents and, in solution, can be used to make laminatable prepregs. The composition has a high glass transition temperature, long pot life and good flame retardancy.
摘要:
An amine curing agent composition for an epoxy resin is provided having low volatility and good processability containing a) a polyamine curing agent and b) an aliphatic alcohol-alkylene oxide adduct. An epoxy resin-polyamine curing agent system containing an aliphatic alcohol-alkylene oxide adduct is also provided.
摘要:
A composition comprising a 1,2-dialkylidenecyclobutane such as 1,2-dimethylenecyclobutane and a polyimide such as a bismaleimide can be thermally cured to a tough copolymer having a high glass transition temperature and low water absorbance.