| 摘要 |
<p>The amorphous polyester chip of the present invention is characterized by a moisture content of not more than 300 ppm and a fine particle content of not more than 500 ppm. According to the amorphous polyester chip of the present invention, a formed product having a uniform polymer composition can be produced with superior processing operability. <??>As one preferable embodiment of the chip, an amorphous polyester chip which is a copolymerized polyester chip comprising a main repeating unit consisting of ethylene terephthalate, and 1,4-dimethylene-cyclohexane terephthalate or neopentyl terephthalate, wherein the glycol component of the copolymerized polyester has a specific composition of 50 to 85 mol% of ethylene glycol, 12 to 45 mol% of 1,4-cyclohexanedimethanol or neopentyl glycol and 1.5 to 7.0 mol% of diethylene glycol, can be mentioned. With such copolymerized polyester chip, a formed product (particularly film) having a uniform polymer composition and superior in transparency and solvent adhesion can be achieved. <??>The amorphous polyester chip of the present invention can be obtained by a method including cooling an amorphous polyester obtained by melt polymerization, cutting the polyester to give a chip, feeding the chip in a treatment tank of a fluidized bed type drying apparatus, passing the chip while drying by flowing a dry gas, or, after drying in vacuo or by flowing a small amount of a dry gas in vacuo in a dryer drying apparatus, transferring the chip to a fine particle removing apparatus without allowing contact with outside air and removing fine particles.</p> |
