| 摘要 |
Copolyamides are polycondensed from a polymerization recipe including caprolactam, dimeric fatty acid and hexamethylenediamine, said dimeric fatty acid having an iodine number of less than 30, containing less than about 0.5% by weight of its monobasic fatty acid precursor, and not more than 5% of such acid having a basicity of greater than 2, and said dimeric fatty acid and the hexamethylenediamine being present in the recipe as a solvent solution of an essentially stoichiometrically balanced salt. The resultant copolyamides are essentially linear, flexible, display improved chemical and mechanical properties, and have high molecular weights and high melting points, and are easily shaped into a variety of useful articles, e.g., by molding or spinning. |
