Abstract:
A soluble solution of high molecular weight aromatic polyamide imide composition, having a degree of imidization of at least about 95%, is obtained directly in a one step heating process by reacting, at 200*-350*C, certain aromatic tricarboxylic acid and aromatic diamines with phosphorus compound as catalyst in a selected solvent, at a reactant concentration of 40-90%, and then diluting the reaction media with additional solvent as the reaction progresses.
Abstract:
Novel polyimide solutions are provided which are obtained by reacting 1,2,3,4-butane tetracarboxylic acid or a functional derivative thereof with an organic diamine for example an aromatic diamine such as diaminodiphenyl ether in certain reaction solvents for example phenols, nitrobenzenes, pyridines, quinolines, N-alkyl lactams and cyanobenzenes at a temperature of from 100* C. to the boiling point of the reaction mixture until a polyimide solution is obtained having an imidization ratio of 5098 percent is obtained. The products thus obtained can be employed as varnishes, to make film coating for electric cable, as adhesives or blended with pigments and the like to make pains.
Abstract:
The present invention provides a thermosetting resin excellent in thermal stability, mechanical properties and electrical properties which is obtained by reacting dimaleimide with an amide in molten state.
Abstract:
1,203,603. Stabilizing polyethylene terephthalates. TORAY INDUSTRIES Inc. 5 July, 1967 [24 Sept., 1966; 15 April, 1967], No. 30995/67. Heading C3R. Polyesters in which the recurring units consist wholly or predominantly of ethylene terephthalate units are stabilized against heat and oxidation by adding to them from 0.001 to 5% of at least one nitrogen containing compound of formula (a) where R 1 is hydrogen, a C 1-10 hydrogen group or a C 1-10 hydroxyalkyl group, R 2 and R 3 are hydrogen or C 1-10 hydrocarbon groups and n is 1 or 2; (b) where R 1 , R 2 , R 3 and n are as above and R is a di- or tri-valent benzene ring group; (c) where R 4 is a C 1-10 hydrocarbon group, R 5 is hydrogen, a C 1-10 hydrocarbon group or an alkoxyaryl group containing 1-10 carbon atoms in the alkyl moiety, R 6 is an alkoxyaryl group containing 1-10 carbon atoms in the alkyl moiety, and X is hydrogen, a hydroxyl group or the group (d) where R 7 is an alkylene or alkenylene group or a 1,2 - phenylene or 1,8 - naphthalene group whose nuclei may be substituted (e.g. by alkyl, halogen, carboxyl, alkoxycarbonyl or hydroxyalkoxycarbonyl), R 8 is a hydrogen atom, an acyl group, a hydrocarbon group which may be substituted by a carboxy, hydroxyl, alkoxycarbonyl or hydroxyalkoxycarbonyl group and n is 1 or 2; (e) where R 9 and R 10 are hydrogen atoms, phenyl groups or C 1-10 alkyl groups; or (f) where R 1 and R 2 are as defined above, R 14 is hydrogen or a C 1-10 hydrocarbon group and m is 1, 2 or 3. The stabilizers may be added before or during the preparation of the polyester or to the final product.