Method for Producing Rubber-Like Polymer
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United States of America Patent
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Feb 26, 2015
app pub date -
Mar 21, 2013
filing date -
Mar 26, 2012
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Abstract
A method for producing a rubber-like polymer comprises extrusion drying rubber-like polymer using an expansion-type extrusion dryer provided with a die having an opening at an outlet; and hot-air drying the rubber-like polymer by using a hot air dryer, water content of the rubber-like polymer at an inlet of the dryer is 6 to 25% by mass; die flow rate F/S obtained by dividing treatment amount (F) of the rubber-like polymer in the dryer by opening area (S) of the die is 1 to 15 kg/hr/mm2; die shape factor obtained by dividing total edge length of the die at the outlet of the dryer by opening area of the die is 1.0 to 4.0 mm−1; water content of the rubber-like polymer at the outlet of the dryer is 20 to 70% based on the water content of the rubber-like polymer at the inlet of the dryer.
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