| 摘要 |
<p>PURPOSE:To obtain the poly p-phenylene sulfide film excellent in sizing stability under heating, in short time required for its thermosetting by heat treating said film drawn in the direction of binary axes at specially determined temperature by two steps. CONSTITUTION:Poly p-phenylene sulfide film drawn and prepared in the two directions of longitudinal and transverse axes is first heat treated at 150-Tm deg.C (Tm is the melting point of poly p-phenylene sulfide film before its heat treatment). Next, the film is heat treated in the range above this first heat treatment temperature and below 350 deg.C at the process of contraction or expansion controlled under 30% in one direction or two directions, or at constant length. Used poly p-phenylene sulfide is the main component of the film, and above 90mol percents thereof is preferably the polymer composed of constructing unit shown by the formula. When said value is less than 90mol percents, the crystal property becomes lower. Then, not only the heat resistive and mechanical properties are lowered, but also harmful effects occur for its sizing stability.</p> |
