摘要:
The application relates to fluorine-containing polyimides, polyamide-acids/esters, polyamides, addition polyimides and imide oligomers which exhibit low melting points, better solubilities, low dielectric constants, superior thermal and thermal oxidative stability, and improved processing characteristics. The products of this application are characterized by the fact that they are derived from 4,4'-bis[2-(amino(halo)phenoxyphenyl)hexafluoroisopropyl]diphenyl ether.
摘要:
A process for the preparation of maleimide by the vapor phase oxvdehydrogenation of succinimide over an iron phosphate catalyst which may also contain one or more alkali metal and alkaline earth metal components is described.
摘要:
A process for producing N-substituted maleimides Which comprises heating maleic anhydride and an aromatic or aliphatic amine, or maleic acid monoamides obtained from them, in the presence of an ion exchange resin in an organic solvent to effect cyclodehydration.
摘要:
A method for the production of maleimides, which comprises subjecting maleinamic acids to ring-closure imidation in an organic solvent capable of forming an azeotrope with water in the presence of an acid catalyst at a temperature in the range of 120° to 250°C while removing the formed water in the form of an azeotrope with said organic solvent and thereafter purifying the produced maleimides.
摘要:
A process for the nitrogenation of hydrocarbons, which results in the production of cyclic imides and nitriles comprises contacting hydrocarbons with molecular oxygen and a nitrogenating agent, including ammonia or primary amines, in the presence of an oxidation catalyst containing variable calency metal oxides, in the vapor phase at elevated temperature.