Tetrafluoroethylene/hexafluoropropylene copolymers with higher drawability

a technology of tetrafluoroethylene and hexafluoropropylene, which is applied in the field of tetrafluoroethylene/hexafluoropropylene copolymer with higher drawability, can solve the problems of high extrusion rate limitation, high cost, and uneven surface roughness and/or wall thickness

Inactive Publication Date: 2009-09-01
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such high extrusion rates are limited by the occurrence of melt-fracture like with many thermoplasts.
Melt-fracture results in surface roughness and/or uneven wall thickness.
Thus the manufacturing of these mixtures is a cumbersome and costly process.
Melt pelletizing of unstabilized polymer resins results in corrosion of the equipment used in the process and in metal contamination of the melt pellets.
However, the stabilization process of DE 2,613,642 and DE 2,613,795 is very difficult to manage due to corrosion of the equipment because of the use of a water steam.
Metal contaminants are difficult to cope with.
Such metal contaminants may result in degradation and decomposition of the copolymer at high processing temperatures.
Decomposition generally leads to discoloration and degradation, and to a build up of die drools.
Die drools impair the coating processing.
Also, cone breaks can occur.
Thus long processing times are more difficult to achieve.
Furthermore, extrusion temperatures have to be kept as low ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0048]A stainless steel 1500 l reactor was charged with 1000 l of deionized water containing 3 kg of the ammonium salt of perfluoro-octanoic acid. Air was removed by evacuation and purging with N2. The reactor was heated to 70° C. and the temperature kept constant. 2 kg of 25% ammonia in water was added.

[0049]The vessel was pressurized with TFE and HFP to 17 bar such that the partial pressure of HFP was 12.5 bar. The polymerization was started by adding 1600 g of ammonium persulfate diluted in 5 l deionized water within 10 min. The pressure was kept constant by feeding a gaseous mixture of TFE / HFP into the reactor. The TFE / HFP weight ratio was 0.14. After 6 hours the reaction is stopped by interrupting the monomer feed. The monomers were vented off. The reactor was cooled to room temperature and discharged. The solid content of the polymer dispersion was 29%, the dispersion was practically free of coagulum. The MFI-value was 20 g / min. The HFP content of the copolymer was 13 w / %. The...

example 2

[0057]Sample A11 was run through a wire coating extruder under two different sets of conditions together with a commercial product designated C1. Sample A11 was manufactured like A1 but had a MFI value of 24 g / min. A11 is a reproduction of A1 as to the polymerization and work up. It had 28 endgroups and an iron content of 18 ppb. The Mw / Mn ratio was measured to be 1.6. The calculated value was 1.7. The extractable fluoride ion content was 0.2 ppm.

[0058]The coating conditions are listed in Tab. 3.

[0059]

TABLE 3Coating Performance of the material according to the inventionin comparison to a commercial product C1 and to sample A0 Run # 123SampleA11A11C1MFI g / min242421Copper Wire temp. (F.)350380350176° C.193° C.177° C.Cone Length (inch)2.01.52.0Die Temperature (F.)716735716380° C.391° C.380° C.Extruder Speed (rpm)21.324.718.5Line Speed (fpm)171020061402521 mps611 mps427 mps

[0060]Temperature profiles, not given in the tab., were slightly adjusted to maximize the ...

example 3

[0062]Samples A11, A12 and a commercial products were run through a slightly different wire-coating extruder.

[0063]The coating conditions are listed in Tab. 4.

[0064]

TABLE 4Coating Performance of the material according to the invention incomparison to 2 commercial products Run # 12SampleA11 / A12C2MFI g / min24 / 2325Copper wire temp. (F.)380 / 375350193° C. / 190° C.177° C.Cone Length (inch)2.02.05.1 cm5.1 cmDie temp. (F.)760760404° C.404° C.Extruder Speed (rpm)42.532.0Line Speed (fpm)17001390518 mps415 mps / 417 mps

[0065]Temperature profiles were adjusted to maximize the line output while maintaining the deviation of the insulation eccentricity between 0.0003 and 0.0007 inches (0.00076 and 0.0018 cm).

[0066]Run # 1 did not show noticeable die drool and exhibited only 2 cone-breaks during a period of 29 hours of extruding wire colors of blue, green, orange, brown and white.

[0067]Run # 2 showed considerable die drool and averaged 6-8 cone-breaks during a run period of 24 hours.

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Abstract

A tetrafluoroethylene/hexafluoropropylene copolymer with high drawability is provided. Also provided is a process employing the polymer and an article coated with the polymer.

Description

[0001]This application claims priority from U.S. Serial No. 60 / 117,780 filed Jan. 29, 1999.FIELD OF THE INVENTION[0002]The invention relates to melt-processable tetrafluoroethylene (TFE) / hexafluoropropylene (HFP) copolymer melt pellets having an improved processability for wire and cable application and to a method of using this polymer to cost wire and cable conductors.BACKGROUND[0003]Melt processable copolymers with TFE and HFP are-well know under the name FEP. As perfluorinated thermoplasts, such copolymers have unique end-use properties like chemical resistance, weather resistance, low flammability thermal stability and outstanding electrical properties. Like other thermoplasts, FEP is easily molded to coated wires, tubes, pipes, foils and films.[0004]Because it has excellent thermal stability and is practically non-flammable, FEP is frequently used for plenum constructions to meet fire resistance requirements. It is also the natural choice in data transmission cables due to its...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F214/18C08F214/28B29C48/06B29C48/08B29C48/09C08F8/22
CPCB29K2027/18B29L2031/3462C08F8/22C08F214/26B29C48/022B29C48/06B29C48/08B29C48/09
Inventor KAULBACH, RALPHKILLICH, ALBERTKLOOS, FRIEDRICHLOEHR, GERNOTMAYER, LUDWIGPETERS, ERIKBLONG, THOMAS J.DUCHESNE, DENIS
Owner 3M INNOVATIVE PROPERTIES CO
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