A method for producing a population of particles of a copolymer comprising polyethylene terephthalate or polybutylene terephthalate or pet and / or PBT.

摘要

The present invention relates toA method for producing a group of particles of polymer;Here the polymerA copolymer comprising polybutylene terephthalate (= PBT) or polyethylene terephthalate (= PET) or polybutylene terephthalate and / or polyethylene terephthalate;Here is polymerSolvents were selected to fully solubilize the polymer only at a temperature of 100. Deg.c at a solvent.Dissolved in organic solventsHere is howHeating the solid polymer immersed in the solvent and the solvent to at least a first temperatureHere the polymerCompletely dissolves at the first temperatureCooling the solution until reaching the second temperatureThe turbidity of the solution hereStart at the second temperatureFurther cooling the solution at a rate in the range of 0.05Or at least 5 minutesThe solution is maintained at a temperature of at least 3.degree. C. higher than the second temperature or the second temperatureThenCooling the solution at a rate ranging from 0.05 ° C. to 5Cooling is hereAt leastUntil the third temperature is reachedThe turbidity does not increase further at the third temperatureThe separation of particles formed between the solution and the solution formed between the solution and the solution is included.The present invention relates to the above method.