| 摘要 |
1479394 Polyhydrazide solutions E I DU PONT DE NEMOURS & CO 22 Sept 1975 [23 Sept 1974] 38787/75 Heading C3R A solution from which fibres and films may be made comprises a palyhydrazide or copolyhydrazide dissolved in an aqueous solution of an organic base. The polymer has equimolar amounts of repeating units of formulµ where R<SP>1</SP> and R<SP>2</SP> are divalent radicals or bonds and R<SP>3</SP> is hydrogen or methyl. Fibres are obtained by spinning the solution into a dilute acidic bath. The polymers are obtained by reacting dihydrazides with dicarboxylic acid chlorides. In examples the dihydrazides are terephthalic dihydrazide, chloroterephthalic dihydrazide, oxalic dihydrazide, terephthalic acid bis(2 - methylhydrazide), p - phenylenediacetic acid dihydrazide, 2,5 - pyridinedicarboxylic acid dihydrazide and isophthalic dihydrazide; the acid chlorides are terephthaloyl chloride, 2,5 - pyridinedicarbonyl chloride, chloroterephthaloyl chloride, oxalyl chloride, 5 - tert. - butylisophthaloyl chloride, 4,4<SP>1</SP>- bibenzoyl chloride and 2,5 - dihydroterephthaloyl chloride; various polymers and copolymers are prepared and dissolved in aqueous solutions of the organic bases tetraethylammonium hydroxide, tetramethylammonium hydroxide, diethylamine, piperidine, tert.-butylamine, methylbutylamine, pyrrolidine, triethylamine and tetrapropylammonium hydroxide. |
