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Compositions comprising melt-processable thermoplastic fluoropolymers and methods of making the same

A melt-processing, polymer technology, applied in the field of compositions comprising melt-processable thermoplastic fluoropolymers and their manufacture, capable of solving problems such as melt cone fractures, production interruptions, detachment of die deposits, etc.

Active Publication Date: 2009-03-25
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During rapid extrusion processes such as wire insulation, large amounts of accumulated die deposits break away from the die and can cause the molten cone to break ("cone breakage"), causing production interruptions

Method used

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  • Compositions comprising melt-processable thermoplastic fluoropolymers and methods of making the same
  • Compositions comprising melt-processable thermoplastic fluoropolymers and methods of making the same
  • Compositions comprising melt-processable thermoplastic fluoropolymers and methods of making the same

Examples

Experimental program
Comparison scheme
Effect test

example

[0097] method

[0098] Melt Flow Index (MFI) was measured according to ASTM D-1238 under a load of 5.0 kg and reported in g / 10 min. Unless otherwise stated, a temperature of 265°C was applied and a standard extrusion die with a diameter of 2.1 mm and a length of 8.0 mm was used.

[0099] The melting peak of the fluororesin was determined according to ASTM 4591 using Perkin-Elmer DSC 7.0 (PerkinElmer, Wellesley, MA) under nitrogen flow and a heating rate of 10°C / min. The indicated melting points refer to the maximum value of the melting peak.

[0100] Latex particle size was determined by dynamic light scattering according to ISO / DIS 13321 with a Malvern Zetazizer 1000 HSA (Malvern Instruments Inc., Southborough, MA). The average particle size reported is the Z-average particle size. Before the measurement, the polymer latex resulting from the polymerization reaction was diluted with a 0.001 mol / L KCl solution, and the measurement temperature was 20° C. in all cases.

[0...

example 1

[0107] A terpolymer having a linear linear structure of 39 mol % TFE, 11 mol % HFP and 50 mol % VDF was prepared in a polymerization tank with a total volume of 48.5 liters equipped with an impeller agitator system according to the following procedure. 29.0 liters of deionized water, 2 g of oxalic acid, 12 g of ammonium oxalate, and 252 g of a 30% by weight aqueous solution of ammonium perfluorooctanoate (APFO) were added to the kettle. Then, the oxygen-free autoclave was heated to a maximum of 40° C. and the stirring system was set at 240 rpm. Add ethane to the kettle to 1.2 bar absolute pressure, add 953g hexafluoropropylene (HFP) to 7.5 bar absolute pressure, add 283g vinylidene fluoride (VDF) to 11.7 bar absolute pressure and add 429g tetrafluoroethylene (TFE) to The reaction pressure was 15.5 bar (absolute pressure). By adding 10ml 1.0% potassium permanganate (KMnO 4 ) aqueous solution initiates the polymerization, and maintains KMnO with a feed rate of 120ml / h 4 Conti...

example 2

[0112] Utilize the method similar to example 1 to prepare the high molecular weight fluoropolymer with linear straight chain structure, difference only is to press into 0.2bar ethane, and use 0.5% potassium permanganate (KMnO 4 ) aqueous solution. Other polymerization conditions and polymer post-treatment were the same. The resulting polymer has the following physical properties:

[0113]

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Abstract

A composition comprising a first fluoropolymer and a second fluoropolymer. The first and second fluoropolymers are melt-processable, thermoplastic and have a melting point between 100 DEG C. and 320 DEG C. The first fluoropolymer has a relaxation exponent of from 0.93 to 1.0. The second fluoropolymer has a relaxation exponent of from 0.3 to 0.92. A composition comprising a first fluoropolymer having a long chain branching index of from 0 to 0.1 and a second fluoropolymer having a long chain branching index of at least 0.2. A composition comprising a core-shell polymer having a first polymer portion, wherein a polymer having an identical chemical structure as the first polymer portion has a relaxation exponent of from 0.93 to 1.0, and a second fluoropolymer portion, wherein a polymer having an identical chemical structure as the second fluoropolymer portion has a relaxation exponent of from 0.3 to 0.92. Methods for making compositions and methods of making articles from compositions.

Description

Background technique [0001] Fluoropolymers have been used in a variety of applications due to several desirable properties such as heat resistance, chemical resistance, weather resistance, and UV stability. Fluoropolymers include homopolymers of gaseous fluorinated olefins such as tetrafluoroethylene (TFE), chlorotrifluoroethylene (CTFE) and / or vinylidene fluoride (VDF), and said olefins with one or Copolymers of various gaseous or liquid comonomers such as hexafluoropropylene (HFP) or perfluorovinyl ether (PVE) or non-fluorinated olefins such as ethylene (E) and propylene (P). [0002] Fluoropolymers include melt processable and non-melt processable polymers. For example, polytetrafluoroethylene and copolymers of tetrafluoroethylene with small amounts (eg, no greater than 0.5 weight percent) of comonomer are generally not melt processable with conventional equipment because of their high molecular weight and high melt viscosity. Therefore, for these non-melt-processible flu...

Claims

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Application Information

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IPC IPC(8): C08L23/28C08L27/12
CPCC08L27/16C08L2205/02C08L2205/025C08L27/18C08L27/20C08L27/10C08L27/12C08L2666/04
Inventor 哈拉尔德·卡斯帕克劳斯·欣策
Owner 3M INNOVATIVE PROPERTIES CO
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