| 摘要 |
PROBLEM TO BE SOLVED: To enhance the modulus of rigidity of liquid crystalline polyester fiber and eliminate its surface defect and further, reduce its oligomer quantity buy blending non-liquid crystalline polyester and liquid crystalline polyester with a specific wt.% of fluidization promoter which reduces a filtration pressure at least in a specific value during the passage of these polymer through filter. SOLUTION: In a method for manufacturing a film by filtering a polymer after extruding it in a molten state from an extruder, the molten polymer is extruded from the extruder which blends non-liquid crystalline polyester and liquid crystalline polyester with one wt.% of addition of fluidization promoter which reduces a filter pressure by at least 10% to be filtered into a film, Further, the non liquid crystalline polyester and the liquid crystalline polyester are blended with the fluidization prompter which is a low molecular weight liquid crystalline polyester of the monopolymer or the copolymer type with a number average molecular weight of 1000-15000 to obtain the film. Thus it is possible to inhibit the shape relaxation of the liquid crystalline polyester fiber and consequently, enhance its modules in torsion and eliminate its surface defect, and further reduce it oligomer quantity. |
