Melt-fabricable tetrafluoroethylene/fluorinated vinyl ether copolymer prepared by suspension polymerization

A technology of fluorinated vinyl ether and tetrafluoroethylene is applied in the field of preparing melt-processable tetrafluoroethylene/fluorinated vinyl ether copolymer, which can solve problems such as cost increase

Inactive Publication Date: 2009-06-24
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of this is in contrast to dispersion polymerization, which employs large amounts of surfactants, leading to increased costs and requiring recycling and / or disposal steps

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Polymerization was carried out in a 37.9 L stainless steel autoclave surrounded by a jacket in which a heat transfer fluid was circulated for heating or cooling purposes. The autoclave is equipped with a 2-blade, 45° angled, straight downdraft agitator mounted on a vertical shaft. Pressures are given in absolute.

[0038] 21.3L of demineralized water and 1g of citric acid were charged into the autoclave. After deoxygenation, 300 g of perfluoro(ethyl vinyl ether), PEVE, was passed through the stopcock. The autoclave was cooled to 25°C and ethane was introduced to raise the pressure by 3.4 kPa. The autoclave was charged to 1.83MPa with TFE at 65°C. A total of 27 g of APS was injected as initiator. After the preparation started, the TFE feed valve was opened and additional TFE monomer was continuously fed into the autoclave to maintain the pressure at 1.83 MPa during the subsequent reaction. The solution of APS was continuously injected for 80 minutes at a rate of sup...

Embodiment 2～13

[0041] The procedure of Example 1 was repeated in Examples 2-13, but the process conditions and the copolymers produced were as shown in Table 1. All of the resulting copolymers passed the flex test without breaking.

[0042] Table 1

[0043] Example Comonomer Comonomer Initiator Ethane Comonomer, Comonomer Secondary

[0044] Type Pre-addition amount, Pre-addition amount, Pre-addition amount, Secondary addition amount, Addition time,

[0045] g g kPa g min

[0046] 2 PEVE 300 27 20.3 180 40

[0047] 3 PEVE 300 27 13.5 180 40

[0048] 4 PPVE 300 27 20.3 180 40

[0049] 5 PPVE 300 27 20.3 180 40

[0050] 6 PPVE 300 21 20.3 180 40

[0051] 7 PPVE 450 27 27.1 0 0

[0052] 8 PPVE 600 27 20.3 0 0

[0053] 9 PPVE 300 27 13.5 180 40

[0054] 10 PEVE 300 27 13.5 180 40

[0055] 11 PMVE 300 27 13.5 180 40

[0056] 12 PMVE 300 27 13.5 180 40

[0057] 13 PMVE 300 27 13.5 180 40

[0058] Table 1 (continued)

[0059] Example Initiator Comonomer Con...

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PUM

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Abstract

A melt processable, flexible copolymer of tetrafluoroethylene and fluorinated vinyl ether produced by suspension polymerization comprising: tetrafluoroethylene and fluorinated vinyl ether in an aqueous medium, a free radical initiator and a telomer The copolymerization is carried out in a pressurized, stirred reaction vessel, the aqueous medium is substantially free of fluorine-containing organic solvents. The contents of the reaction vessel were sufficiently agitated during the polymerization reaction to coagulate the copolymer of tetrafluoroethylene and fluorinated vinyl ether. Reduce the melt viscosity to less than about 1 x 10 6 The melt-processable, ductile copolymer in Pa.s was isolated directly from the reaction vessel.

Description

technical field [0001] This invention relates to an improved process for the preparation of melt processable tetrafluoroethylene / fluorinated vinyl ether copolymers. Background technique [0002] Polymers prepared from fluorinated monomers such as tetrafluoroethylene (TFE) exhibit excellent physical properties including toughness, chemical and thermal resistance, corrosion protection, strippability, cleanability, low flammability and weathering resistance sex. High molecular weight polytetrafluoroethylene (PTFE) homopolymers offer the highest thermal stability among fluoropolymers but have extremely low melt flow, making processing of such polymers difficult. It is known that the melt flow of TFE polymers can be increased by copolymerization with ethylenically unsaturated monomers to create plastics with flow high enough to allow processing by melt extrusion or injection molding. [0003] US Patents 2,559,752 to Berry and 2,952,669 to Bro both disclose the copolymerization ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26
CPCC08F214/262
Inventor R·M·阿滕
Owner EI DU PONT DE NEMOURS & CO
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