| 摘要 |
PURPOSE:To improve polyester yarn showing anisotropy in melting into yarn capable of exhibiting sufficient strength as a reinforcing material so that it has improved adhesiveness to a parent material, by treating the polyester yarn in an aqueous solution of a specific metal hydroxide. CONSTITUTION:Polyester yarn showing anisotropy in melting (preferably copolymer consisting of p-hydroxybenzoic acid and 2-hydroxy-naphthalene-6-carboxylic acid) is treated with an aqueous solution of a metal hydroxide selected from Li, Na, K, Mg, and Ca at 20-120 deg.C, preferably at 60-100 deg.C for >=1min. The concentration of the metal hydroxide is preferably 0.1-5mol/l calculated as hydrogen ion concentration. |
