Biaxially oriented polypropylene film and method for producing same
A polypropylene film, biaxially oriented technology, used in chemical instruments and methods, other household appliances, electronic equipment, etc., can solve the problems of reduced capacitor capacity, reduced productivity, increased thermal shrinkage, etc., and achieves excellent and high rigidity. , the effect of excellent dimensional stability
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Embodiment 1
[0080] 1.0% by mass of 1.0% by weight was blended into a polypropylene resin manufactured by Prime Polymer Co., Ltd. having a mesopentad fraction of 0.985 and a melt flow rate (MFR) of 2.6 g / 10 minutes as linear polypropylene. Branched-chain polypropylene resin (high melt tension polypropylene Profax PF-814) manufactured by Basell was supplied to an extruder at a temperature of 250°C, and melted and extruded into a sheet through a T-shaped slot die at a resin temperature of 250°C. On a casting drum at 90° C., the molten sheet was brought into close contact with an air knife, cooled and solidified to obtain an unstretched sheet. Next, the sheet was gradually preheated to 140° C. with a plurality of roll sets, and then stretched 4.8 times in the longitudinal direction by passing between rolls maintained at a temperature of 145° C. with a difference in linear speed. The film conveying speed at the entrance of the transverse stretching step was set to 99.0% of the film conveying s...
Embodiment 2～5 and comparative example 1、3～4
[0082] A biaxially stretched polypropylene film was obtained in the same manner as in Example 1 except that the annealing conditions of the product roll were the conditions described in Table 1. The film characteristics and capacitor characteristics of the biaxially oriented polypropylene films of Examples 2 to 5 are shown in Table 1, and they were excellent in withstand voltage and reliability. On the other hand, the film characteristics and capacitor characteristics of the biaxially oriented polypropylene films of Comparative Examples 1 and 3 were shown in Table 2, and were low in withstand voltage and slightly inferior in reliability, which caused problems in actual use. In addition, the film characteristics and capacitor characteristics of the biaxially oriented polypropylene film of Comparative Example 4, as shown in Table 2, were in an unevaluable state because the annealing temperature was too high and the films were stuck together.
Embodiment 6
[0084]Except not performing the annealing treatment of the product roll, it carried out similarly to Example 1, and obtained the biaxially stretched polypropylene film. The characteristics and capacitor characteristics of the biaxially oriented polypropylene film of this example are shown in Table 1, and it is excellent in withstand voltage and has a level of reliability that can be used depending on conditions.
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