| 摘要 |
<p>1,228,473. Coating. I.W.S. NOMINEE CO. Ltd. 11 March, 1968 [11 March, 1967], No. 11790/68. Heading B2E. [Also in Divisions C3 and D1] A process for applying a polyamide to a fibrous or filamentous substrate comprises reacting a diamine and a dicarboxylic acid ester in the presence of both the substrate and a catalyst. Especially preferred diamines are hexamethylenediamine, ethylenediamine and trimethylhexamethylene diamine whilst the dicarboxylic acid esters are derived from aliphatic, cycloaliphatic or aromatic dicarboxylic acids such as sebacic acid, 1, 4-cyclohexane dicarboxylic acid, terephthalic acid and isophthalic acid. The preferred ester is the 2, 4, 5 trichlorophenyl ester. Suitable catalysts are glacial acetic acid, imidazole and 1, 2, 4- triazole. The substrate may be filamentary, e.g. keratin-containing fibres, cotton wool or silk; sliver, yarn, combed material, woven or knitted fabrics, paper, cardboard or composed of synthetic fibres. The reaction is preferably carried out at a pH of 9.5-11 and in a steam atmosphere at a temperature of 80‹-90‹C.</p> |
