White film and a method of manufacturing opaque white film
A technology of white, polyester resin, applied in the field of white film of oligomer extract
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Embodiment 1
[0076] 1) Preparation of polyester chips
[0077] Based on 100 parts by weight of terephthalic acid, 50 parts by weight of ethylene glycol was added to the esterification reactor, and then water was flowed out of the reactor by applying a pressure of 912 torr at 250° C. for 4 hours to carry out the esterification reaction , to prepare bis(2-hydroxyethyl) terephthalate. 300 ppm of antimony trioxide was added thereto as a polymerization catalyst, and condensation polymerization was performed by raising the temperature from 250°C to 285°C at 60°C / hr and lowering the pressure to 0.5 Torr. During the condensation polymerization reaction, 30 minutes before the stirring was carried out to the reaching point, the end-blocking agent 2,2-bisoxazoline (2,2-bisoxazolin) was added with 0.05wt%, and then when the desired stirring torque was reached When the reaction system was filled with nitrogen to return to normal pressure, the condensation polymerization reaction was completed, dischar...
Embodiment 2~5
[0086] A white film was prepared in the same manner as in Example 1, except that a masterbatch having the same physical properties prepared according to Table 1 below was used. The physical properties of the prepared white films were determined and are shown in Table 1 below.
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