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Oriented fluoropolymer film

A technology of oriented film and copolymer, which is applied in the field of oriented fluoropolymer film, can solve the problems such as the reduction of MIT flex life

Inactive Publication Date: 2016-08-31
THE CHEMOURS CO FC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, according to '406, a small increase in the MFR of FEP is accompanied by a large decrease in the flex life of the MIT

Method used

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  • Oriented fluoropolymer film
  • Oriented fluoropolymer film
  • Oriented fluoropolymer film

Examples

Experimental program
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Effect test

example

[0084] Unless otherwise specified, the compositions used in the following examples were dry / extruded blends of FEP and PFA having the following composition (all % based on total weight of copolymer):

[0085] PFA: Copolymer of TFE and 7.5% by weight PEVE with an MFR of 7 g / 10 minutes, a melting temperature of 290°C, and an elongation of 290%.

[0086] FEP 1: Copolymer of TFE, 10% by weight HFP and 1.2% by weight PEVE, the copolymer has 6 About 20 unstable end groups (mainly -COOH) per carbon atom, MFR of 20 g / 10 min, melting temperature of 255° C. and elongation of 361%.

[0087] FEP 2: Copolymer of TFE, 10% by weight HFP and 1.2% by weight PEVE, the copolymer has 6 About 25 unstable end groups per carbon atom (mainly -COOH), MFR of 30 g / 10 min, melting temperature of 257° C. and elongation of 345%.

[0088] 15 sec at a melt temperature of 350 °C and a draw ratio characterized by a speed much greater than the film line speed of the extrusion speed -1 A dry blend of FEP and ...

example 1

[0094] Example 1 - Improved Hinge Durability

[0095] Two oriented 5.5 mil (0.14 mm) thick films are heat sealed to form a container such as figure 1 with figure 2 shown. The films were each Composition 1. Heat sealing was accomplished by using a heat bar heated to 260° C. which pressed the overlapping film portions together against the platen for a few seconds. The presence of the heat seal was observed by the fact that the interface between the overlapping film portions was no longer visible. The width of the heat seal is 1 / 8 inch (3.2 mm). The heat seal is allowed to air cool and then repeated to form the remaining sides on the container.

[0096]The container was subjected to multiple cycles of inflation and deflation until one of the films broke at one of the heat seals, which was detected by the inability to inflate the container. Aeration is performed by filling the container with enough air to support a 6 inch (15.2 cm) column of water. Perform deflation by ...

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Abstract

The present invention provides oriented film comprising the composition 55 to 95 wt% tetrafluoroethylene / hexafluoropropylene / perfluoro(alkyl vinyl ether) copolymer and 45 to 5 wt% tetrafluoroethylene / perfluoro(alkyl vinyl ether) copolymer to total 100 wt% based on the combined weight of said copolymers, wherein the alkyl in each copolymer comprises 1 to 4 carbon atoms and wherein the presence of the tetrafluoroethylene / perfluoro(alkyl vinyl ether) copolymer in the composition and the presence of perfluoro(alkyl vinyl ether) in both copolymers improves the thermoformability of the film as compared to oriented film of the same film thickness comprising the tetrafluoroethylene / hexafluoropropylene / perfluoro(alkyl vinyl ether) copolymer by itself.

Description

technical field [0001] The present invention relates to oriented fluoropolymer films exhibiting improved thermoformability. Background technique [0002] US Patents 5,041,500 and 5,179,167 (Ishiwari and Noguchi) both disclose certain blends of tetrafluoroethylene / hexafluoropropylene copolymer (FEP) and tetrafluoroethylene / fluorovinylether copolymer (PFA). In '500, the two copolymers have a melt viscosity (MV) difference of less than 20,000 poise. In '167, the copolymers have a MV difference of at least 20,000 poise. Two patents disclose that FEP / PFA compositions are suitable for molding thick-walled articles in which fracture is inhibited. '500 adds to the disclosure that the composition has good flex resistance. This increased stiffness can be expected from the heterostructure of the composition in this patent. In this regard, the ‘500’s image 3 Individual melting temperatures of FEP and PFA are disclosed up to concentrations of 83% by weight PFA and 17% by weight FEP....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C51/00C08L27/12C08L27/18C08L27/20
CPCC08L27/18C08J2327/12C08J2327/20C08J2427/12C08J2427/20B29K2027/12B29C51/002B29C51/02C08L2205/025C08J5/18C08J2327/18C08J2427/18
Inventor R.M.阿滕H.E.伯奇S.K.文卡塔拉曼R.T.杨
Owner THE CHEMOURS CO FC LLC
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