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
Examples
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.
PUM
| Property | Measurement | Unit |
|---|---|---|
| Percent by mass | aaaaa | aaaaa |
| Percent by mass | aaaaa | aaaaa |
| Percent by mass | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- IPC
- C08F214/26; C08F214/18; C08F214/28; B29C48/06; B29C48/08; B29C48/09; C08F8/22
- CPC
- B29K2027/18; B29L2031/3462; C08F8/22; C08F214/26; B29C48/022; B29C48/06; B29C48/08; B29C48/09
- Inventors
- KAULBACH, RALPH; KILLICH, ALBERT