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A process aid for melting processing polymers

A technology for melt processing and processing aids for the extrusion of non-fluorinated melt-processable polymers

Inactive Publication Date: 2009-03-04
THE CHEMOURS CO FC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, there is room for improvement in extrusion processability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The masterbatch of the present invention (numbering MB-1 etc.) and contrast (numbering MB-A etc.) are produced by the composition shown in table 1 (value percentage by weight), use in production at 300 rpm ( rpm) and a 28mm co-rotating twin-screw extruder operated at 200°C to melt mix the ingredients. The extruded strands are cooled and pelletized in a water bath.

[0065] Table I

[0066] Material MB-A MB-1 MB-2 MB-3 MB-4 MB-B MB-C MB-D MB-5 MB-6 MB-E LLDPE-1 99 96.75 98.5 96 96 86.39 98.5 95 95 95 95 FE-1 0.96 0.96 0.96 0.96 0.96 0 0 0 0 0 0 FE-2 0 0 0 0 0 0 1.5 1.5 1.5 1.5 1.5 FP 0.04 0.04 0.04 0.04 0.04 0 0 0 0 0 0 PCL-1 0 0 0 0 0 0 0 3.5 0 0 0 PCL-2 0 0 0 0 0 0 0 0 3.5 0 0 PCL-3 0 0.25 0.5 1 3 3.61 0 0 0 3.5 0 PCL-4 0 0 0 0 0 0 0 0 0 0 3.5

[0067] Extrusion processability evaluations were performed on a...

Embodiment 2

[0079] The extrudable compositions of the present invention (EC-5 and EC-6) and the control extrudable compositions (EC-C~EC-E) were (respectively) prepared from master batches MB-5, MB-6, MB-7 , MB-8 and MB-C, made by dry blending 1.33wt.% of the masterbatch with LLDPE-1, in all extrudable compositions to obtain 200ppm FE2 fluoropolymer processing aid and 0 (control C) or 465 ppm of PCL surfactants with altered molecular weight (EC-5 and EC-6, EC-D and EC-E). Table III lists the results of extrusion tests and particle size measurements carried out as described in Example 1.

[0080] Table III

[0081] extrudable group

[0082] The results in Table III illustrate that the entire molecular weight range tested of PCL surfactants (in combination with fluoropolymer processing aids) improved extrusion processability by reducing melt fracture, conditioning time, and die pressure. However, at least when used in blends with fluoropolymer FE-2, polycaprolactones with number...

Embodiment 3

[0084] The masterbatch compositions (values ​​in weight %) shown in Table IV were produced using a 28 mm co-rotating twin-screw extruder operated at 300 rpm and 200° C. to melt mix the ingredients. The extruded strands are cooled and pelletized in a water bath. By increasing the concentration of FE-1 in the masterbatch, the size of the fluoroelastomer particles in the masterbatch is increased. when When the amount of dispersive mixing in the extruder is insufficient to reduce the presence of large fluoroelastomer particles in the masterbatch to a weight average diameter of less than 2 microns (at the die entry), a masterbatch containing large particles is less likely than one containing Masterbatches of small fluoroelastomer particles eliminated melt fracture defects more quickly. MB-9 and MB-10 show that by keeping the fluoroelastomer concentration low (same as MB-G and MB-H), while increasing the melt index of the polyethylene used during masterbatch compounding, it is al...

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Abstract

Extrusion processability of non-fluorinated melt-processable polymers is improved by introducing a fluoropolymer process aid by means whereby the weight average particle size of the fluoropolymer is greater than 2 microns as it reaches the extruder die entrance.

Description

[0001] This application is a divisional application of the patent application 02805114.9 of the international application PCT / US02 / 05487 entered into China. technical field [0002] The present invention relates to the extrusion of non-fluorinated melt-processible polymers comprising fluoropolymer processing aids. Background technique [0003] By well-known methods, a viscous polymer melt is propelled through the extruder barrel into a die by means of a rotating screw, the polymer is formed into the desired shape, and then cooled and solidified into a product having the general shape of the die. Molecular polymers such as hydrocarbon polymers and polyamides are melt extruded into shaped structures such as pipes, conduits, cable sheaths or films. [0004] In order to obtain low production costs, it is desirable to extrude polymers at high rates. Higher extrusion rates can be easily obtained by increasing the extruder screw speed. However, this technique is limited due to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L101/04C08L23/00C08J3/00
Inventor G·R·小查普曼S·R·奥里尔尼
Owner THE CHEMOURS CO FC LLC