| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent strength change, discoloration, and defective appearance such as a depression of an extrusion-molded article by the deterioration of the article caused by the water incorporation and oxidation of a polyamide elastomer and to provide a method for efficiently producing a tube which has a dimensional precision applicable to a medical tube, etc., and is reduced in nonuniformity of a tensile modulus of elasticity, tensile elongation, etc. SOLUTION: In the extrusion molding of the polyamide elastomer which is the block copolymer of nylon 12 and a polyether, during the operation of an extrusion molding apparatus, the polyamide elastomer is extruded while the water content of the elastomer to be supplied is kept to be 100-500 ppm, and the variation of the water content is kept within 20% of the average water content.</p> |
