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Melt processible fluoropolymer composition

A technology of melt processing and composition, which is applied in the field of melt processable fluoropolymer compositions, and can solve problems such as difficulty in making block copolymers

Inactive Publication Date: 2008-01-09
DUPONT MITSUI FLUOROCHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Block copolymers are also more difficult to manufacture as they are traditionally prepared using a multi-step process

Method used

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  • Melt processible fluoropolymer composition
  • Melt processible fluoropolymer composition
  • Melt processible fluoropolymer composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] The following examples are given for the purpose of illustration. In the following, the raw materials used in the examples and comparative examples and the evaluation methods adopted for the physical properties of the finished compositions are described.

[0023] (1) Polymer

[0024] The melt-processable fluoropolymers used in the Examples and Comparative Examples are summarized in Table 1, along with their comonomer composition and melt flow rate. In the table, TFE / HFP-2 is a copolymer of TFE and HFP; TFE / HFP-3 is a terpolymer of TFE, HFP and PEVE. PFA-C2 is a copolymer of TFE and PEVE.

[0025] Table 1

[0026] Fluoropolymer

Comonomer content (wt%)

MFR(g / 10min)

TFE / HFP-2(A)

TFE / HFP-3(B)

TFE / HFP-3(C)

PFA-C2(D)

PFA-C2(E)

PFA-C2(F)

HFP12%

HFP11.5%; PEVE1.2%

HFP6.5%; PEVE1.8%

PEVE 13.3%

PEVE 7.1%

PEVE 5.7%

24

22

23

10

19

23

[0027] MFR: Melt flow rate, measured in accordance with AST...

example 1～3 and comparative example 1～6

[0038] A melt blend of TFE / HFP-2 or TFE / HFP-3 and PFA at a weight ratio of 60 / 40 was used to investigate the difference in miscibility under different comonomer composition conditions. The results are summarized in Tables 2A and 2B. When the molten blend shows a single crystallization peak during crystallization and a single melting point appears between the melting points of the individual components during the temperature rise of the crystalline mixture, the mixture is judged to be a miscible blend in the crystallization zone and the components occur. A co-crystallization.

[0039] Table 2A

[0040] Comparison

1

2

3

4

5

6

TFE / HFP-2

(A)

TFE / HFP-3

(B)

TFE / HFP-3

(C)

PFA-C2(D)

PFA-C2(E)

PFA-C2(F)

Crystallization temperature

Melting point

Miscibility

60

40

double

double

Immiscible

60

40

double

double

Immiscible

60

...

example 4～7， comparative example 7 and 8

[0047] Prepare a molten blend. The measured value of flex life is obtained by using a sample made of the obtained composition through compression molding. The results are shown in Table 3. The mixture of PFA-C2(E) and TFE / HFP-3(C) significantly improves the flex life.

[0048] The melt strength of the above-mentioned sample composition was measured with a Capilograph at 370°C. The results are shown in Table 3. Since the purpose is to improve the high-speed spinning performance of TFE / HFP, the melt strength measurement is only performed on a mixture with a TFE / HFP content of at least 60%. The blending of PFA-C2 (E) and TFE / HFP-3 (C) produces blends with improved melt strength.

[0049] The DSC measurement results and DSC chart of the compositions prepared in these examples are summarized in Table 3 and Figures 1(a) and 1(b). As is clearly seen from Figure 1, the TFE / HFP-3(C) / PFA-C2(E) blend shows a single crystallization temperature and a single melting peak in all ratios, indicati...

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PUM

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Abstract

Blends of 3 to 97 parts by weight of tetrafluoroethylene / hexafluoropropylene copolymer containing 3 to 9 wt % hexafluoropropylene and 0 to 4 wt % of tetrafluoroethylene / perfluoro(ethyl vinyl ether) or tetrafluoroethylene / perfluoro(methyl vinyl ether), with 97 to 3 parts by weight tetrafluoroethylene / perfluoro(ethyl vinyl ether) or tetrafluoroethylene / perfluoro(methyl vinyl ether), which co-crystallize are found to have improved melt strength and improved mechanical properties, and a higher service temperature than the tetrafluoroethylene / hexafluoropropylene copolymer.

Description

Technical field [0001] The present invention relates to a melt-processable fluoropolymer composition made by blending at least two different melt-processable tetrafluoroethylene copolymers. Background technique [0002] Tetrafluoroethylene-hexafluoropropylene copolymer (also known as TFE / HFP) has the unique physical, chemical, mechanical, thermal and electrical properties of fluoropolymers and can be easily extruded and injection molded. The HFP content of commercially available copolymers is between 9.6 and 17.6 wt% (weight percent) ("Ullmann's Encyclopedia of Industrial Chemistry" fifth edition, volume A11, p.403, section 2.3.2, VCH Press, D-6940Weinheim, Germany , 1988. The HFP index mentioned in this article can be converted to wt% HFP by multiplying by 3.2, as disclosed in US Patent 5,700,889.) This performance has led to the demand for TFE / HFP copolymers, especially for wire coating Fields (for example, filled plastic molded cables) demand growth. In order to further improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18
CPCC08L27/18C08L2205/02C08L2666/04
Inventor J·C·李S·康多H·萨托
Owner DUPONT MITSUI FLUOROCHEMICALS CO LTD
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