NITROGENOUS POLYMERS PREPARED FROM ESTERS OF AROMATIC TETRACARBOXYLIC ACID DERIVATIVES AND AROMATIC TETRAMINES

摘要

1,200,944. Laminates. MONSANTO GO. 27 July, 1967 [27 July, 1966], No. 34621/67. Heading B5N. [Also in Divisions B2 and C3] Curable polymers are produced by contacting (a) an ester obtained by heating (i) a C 10-24 aromatic tetracarboxylic dianhydride having the anhydride groups separated by at least one carbon, or the corresponding acid or C 1-8 alkyl or aryl ester, with (ii) a C 2-6 alkylene glycol or C 1-8 monether thereof, with (b) a C 6-20 aromatic tetramine having two pairs of adjacent NH 2 groups separated by at least one carbon and free from olefinic or acetylenic unsaturation or interfering substituents. They may be cured at 100‹ to 525‹ C. to polymers containing repeat units such as The reaction between (a) and (b) may be effected without isolating (a). Numerous suitable reactants are specified; in examples (i) is 3,3SP1/SP,4,4SP1/SP - benzophenonetetracarboxylic dianhydride; 1,2,4,5 - benzene tetracarboxylic dianhydride or 1,4,5,8 - naphthalene tetracarboxylic acid, (ii) is ethylene glycol or 2 - methoxyethanol and (b) is 3,3SP1/SP,4,4SP1/SP- biphenyl tetramine. Suspensions or solutions of the curable polymer, optionally containing pigments e.g. TiO 2 , ZnO, SiO 2 , Al 2 O 3 or iron oxide, may be coated on a substrate, e.g. metallic, ceramic or cellulosic, and cured by heating after evaporation of the solvent or diluent. The dried curable polymer may be used as moulding powders while the solution, suspension or dried powder may be used as an adhesive e.g. for laminating glass, silica or boron filaments or textiles, metal, glass or plastics. In examples glass cloth impregnated with the polymer solution is dried at 50‹ C. under vacuum and laminated at 120 p.s.i. at 149‹ C. for 30 minutes then 274‹ C. for 30 minutes.