| 摘要 |
Novel modified nylon-6 may be produced by using a combination of one or more dicarboxylic acids and triethylene glycol diamine and tetraethylene glycol diamine, but not a diethylene glycol diamine. A dicarboxylic acid/polyethylene glycol diamine salt may be reacted with .epsilon.- caprolactam to provide the modified nylon-6. The diamines have the formula NH2-(CH2CH2O)x-CH2CH2-NH2, where x ranges from 2 to 3. Surprisingly, the suitable diamines include triethylene glycol diamine (x = 2; JEFFAMINE R EDR-148 Amine) and tetraethylene glycol diamine (x = 3; JEFFAMINE R EDR-192 Amine), but not closely related bis-aminoethyl ether (x = 1; BAEE). Unexpectedly, BAEE, which only differs from JEFFAMINE EDR-148 Amine by one -(CH2CH2O)- group, did not give satisfactory product ~ the fibers were too weak. The resulting modified nylon-6 polymers of the invention, however, including fibers therefrom, have improved water absorbancy properties and greater flexibility. Polyamide products with a wide range of water adsorbancies may be obtained by adjusting the amount of amide.
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