Fire and heat resistant laminating resin based on maleimido and citraconimido substituted 1-[diorganooxyphosphonyl)-methyl]-2,4- and -2,6-diaminobenzenes

摘要

The subject invention pertains to a novel class of fire- and heat-resistant bisimide resins prepared by thermal polymerization of maleimido or citraconimido substituded 1-[(dialkoxyphosphonyl)-methyl]-2-4 and -2,6-diaminobenzenes. Typical polymer presursors have the chemical structure: <IMAGE> wherein R is alkyl, substituted alkyl or aryl, and R1 is hydrogen or lower alkyl. The polymer precursors are prepared by reacting 1-[(diorganooxyphosphonyl)methyl]-2-4 and -2,6-diaminobenzenes with maleic anhydride or citraconic anhydride in a mole ratio 1:2. Chains extension of the monomers is achieved by reacting the mono-N-maleimido derivatives of 1-[(diorganooxyphosphonyl)methyl]-2,4 and -2,6-diaminobenzenes with aryl tetracarboxylic dianhydrides, such as benzophenone tetracarboxylic diandydride, or aryl diisocyanates, such as methylenebis(4-phenylisocyanate), in a mole ratio 2:1. The polymerization of the monomers is studied by differential scanning calorimetry (DSC) and the thermal stability of the polymers is ascertained by thermogravimetric analysis (TGA).