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Method for crystallizing crystallizable polymers having a high tendency to agglomerate

A polymer, crystallization technology, applied in coatings and other directions, can solve problems such as reducing particle viscosity

Active Publication Date: 2013-06-26
POLYMETRIX AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been shown to reduce the particle viscosity before crystallization

Method used

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  • Method for crystallizing crystallizable polymers having a high tendency to agglomerate
  • Method for crystallizing crystallizable polymers having a high tendency to agglomerate
  • Method for crystallizing crystallizable polymers having a high tendency to agglomerate

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0077] 2.5 kg of polyethylene terephthalate pellets containing 2 mol% of isophthalic acid comonomer, IV value of 0.4 dl / g and particle weight of 15 mg were passed through a cylinder with a diameter of 20 cm orifice. Air at a temperature of 60° C. is passed through for 15 minutes, so that a light fluidized bed is created which expands on average 8 cm over the original charge height. The cycle time was adjusted to 0.46 seconds by a pulser. The resulting specific kinetic energy input per impact is 0.78J / kg or a total of 1530J / kg. The pellet remained free-flowing and distinctly amorphous throughout the duration of the experiment. No agglomerates formed.

example 2

[0079] Example 1 was repeated, but using 80°C air. The pellet remained free-flowing and distinctly amorphous throughout the duration of the experiment. No agglomerates formed.

example 3

[0086] The granules of Example 1 were passed through the same cylindrical barrel by air at 150° C. with an empty pipe velocity of 1.7 m / s for 8 minutes. The granules bonded into clumps and became opaque crystals. The agglomerate can be loosened into individual granules by one impact of 0.5 bar.

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Abstract

The invention relates to a method for producing a semicrystalline polymer, said method comprising the following steps: producing a polymer melt from a crystallizable polymer; shaping particles and solidifying the polymer melt, the step of shaping the particles being carried out before or after solidification; cooling the particles; treating the particles to reduce their tendency to agglomerate; crystallizing the particles. The invention is characterized in that the treatment is carried out by shaking at a temperature T1 which is below the glass transition temperature of the polymer plus 10° C., i.e. T1<Tg+10° C.

Description

technical field [0001] The present invention relates to a method of crystallizing polymers on a large scale to simplify storage, transport, handling or processing of the polymers. Depending on the crystallization rate of the polymer, this crystallization occurs spontaneously during the preparation of the polymer particles or takes place in a separate process step. Depending on the viscous nature of the polymer, the process conditions must be selected during the crystallization process in such a way that a stable process without the formation of sticky particles is ensured. Tackiness is related to the composition of the polymer and its initial behavior during crystallization. Various experiments have been carried out to change the initial conditions to make the polymer less viscous. Background technique [0002] US 3746688 (Berkau) describes the reduction of the stickiness of PET during crystallization by prior drying of several hours. [0003] US 3014011 (Zoetbrood) descr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/06B29B9/16C08J3/12
CPCC08J3/12B29K2995/0041B29B9/16C08J2367/02C08G63/183B29K2067/00C08G63/88B29K2067/046
Inventor B·A·卡伯特A·克里斯特尔M·罗德里格斯
Owner POLYMETRIX AG