| 摘要 |
<p>To provide an efficient process for producing polyester particles from a polyester with a low degree of polymerization by a strand cutting method, polyester particles, a process for producing polyester resin particles from the polyester particles by solid phase polycondensation, and polyester resin particles. A process for producing polyester particles, characterized in that the following steps (1) to (3) are sequentially carried out, and the drawing rate ratio of polyester strands represented by the following formula is from 1.5 to 100, polyester particles, a process for producing polyester resin particles which comprises subjecting the particles to solid phase polycondensation, and polyester resin particles:
(1) a step of discharging a molten polyester having a melt viscosity of from 0.5 Pa·s to 50 Pa·s from a die hole into strands,
(2) a step of bringing the obtained polyester strands into contact with a liquefied fluid for cooling to lead the strands to a cutter together with the liquefied fluid, and
(3) a step of cutting the polyester strands led to the cutter: drawing rate ratio = ( linear velocity of strands immediately before cut v �¢ 2 m / s ) / linear velocity of molten polyester when discharged from die hole v �¢ 1 m / s</p> |
