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Process for the manufacture of thermoplastic polymer particles, thermoplastic polymer particles prepared thereby, and articles prepared therefrom

A thermoplastic polymer and particle technology, applied in the field of preparing thermoplastic polymer particles, can solve problems such as poor particle yield

Pending Publication Date: 2020-06-19
SHPP GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, particles produced by this emulsion distillation method may result in poor yields of particles with desired particle size characteristics
Additionally, achieving particles with an average size of 20 to 100 microns using known technologies remains a challenge

Method used

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  • Process for the manufacture of thermoplastic polymer particles, thermoplastic polymer particles prepared thereby, and articles prepared therefrom
  • Process for the manufacture of thermoplastic polymer particles, thermoplastic polymer particles prepared thereby, and articles prepared therefrom
  • Process for the manufacture of thermoplastic polymer particles, thermoplastic polymer particles prepared thereby, and articles prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115]Examples 1-9 show polymer particles prepared from polycarbonate PC-2. As shown in Table 2 in Examples 1-6, by controlling the speed of the homogenization tool, the particle size distribution can be varied for a range of Dv50 values ​​(5.6 to 21.7). This was determined by using two polymer concentrations (20% and 25%) and a range of oil bath temperatures (70 to 90°C) to determine homogenizer agitation speed (from 5,000 to 22,000 in rpm) and time (from 10 to 20 minutes) to complete. Examples 7-9 show conditions that do not result in proper dispersion or precipitation of the polymer. For each of Examples 7-9, agglomeration of the particles occurred during the precipitation step and the yield of the process was less than 30%. Without wishing to be bound by theory, it is believed that a number of components are responsible for stabilizing the emulsion under high temperature precipitation conditions, such as mixing intensity, volume ratio of immiscible solvents, homogenizati...

Embodiment 11-28

[0119] Examples 11-20 demonstrate the effect of homogenizer agitation speed and surfactant concentration on Dv50. In these examples, SDBS surfactant was used to prepare the aqueous polymer dispersions of the polymers. Two surfactant concentrations, 0.01 wt.% and 0.5 wt.% aqueous solutions were used in the following examples. For each example, 200 g of polymer was dissolved in 800 g of dichloromethane to yield a 20 wt.% polymer solution. The emulsion was prepared using a weight ratio of water to organic phase of 0.6. The examples demonstrate emulsion stability and particle size distribution while homogenizing at 2,800 and 15,000 rpm for extended periods of time (eg, at least 20 minutes). These two homogenization speeds represent control over the shear rate of the emulsion system. The emulsion was converted to an aqueous polymer dispersion using Method A for particle precipitation according to the method described above. Experimental variables and results are shown in Table ...

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Abstract

A process for the manufacture of thermoplastic polymer particles include combining a first solution having a polyetherimide, a polycarbonate, or a combination thereof and an organic solvent with an aqueous solution including a surfactant, and agitating the resulting mixture using a shear force generating device operating at a preselected peripheral rotational speed to provide an emulsion. The emulsion is heated to remove the organic solvent and provide an aqueous polymer dispersion including the thermoplastic polymer particles.

Description

Background technique [0001] High performance polymers such as polyetherimide and polycarbonate can be made into powders by emulsifying the polymer in an organic solvent and further removing the organic solvent from the emulsion by distillation. Additional information related to this approach can be found, for example, in US Patent No. 6,528,611. However, particles produced by such emulsion distillation methods may result in poor yields of particles with desired particle size characteristics. Additionally, achieving particles with an average size of 20 to 100 microns using known techniques remains a challenge. [0002] Therefore, there is still a need for an optimized process to obtain spherical polymer particles with desired size characteristics in high yields for commercial viability. Applications including additive manufacturing and powder coating can benefit from such a process. Contents of the invention [0003] A method for making thermoplastic polymer particles comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14
CPCC08J3/14C08J2369/00C08J2379/08
Inventor 拉胡尔·帕蒂尔泽利科·库泽列维茨小威廉·E·霍拉维斯瓦纳坦·卡利亚纳拉曼米切尔·雷诺兹扎卡里·安德森
Owner SHPP GLOBAL TECH BV