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Process for making a fluoropolymer having nitrile end groups

A technology of fluoropolymers and end groups, which is applied in the field of preparing fluoropolymers with nitrile end groups, and can solve problems such as difficult handling, toxicity, and inconvenient manufacturing process

Inactive Publication Date: 2005-12-21
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it requires an extra step to provide additional energy
Therefore, this method increases the manufacturing cost and causes inconvenience to the manufacturing process
[0004] EP 868447 discloses that using some chain transfer agents (I-(CF 2 ) n -CN) to introduce nitrile end groups; however, the compounds used are costly, toxic, and difficult to handle

Method used

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  • Process for making a fluoropolymer having nitrile end groups

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Under anaerobic conditions, put 2800ml of deionized water into a 4-liter kettle. Add 9 grams of C 7 f 15 COONH 4 (APFO) and 6 grams of KSCN. After heating to 70°C, 96 grams of tetrafluoroethylene (TFE) and 247 grams of perfluoromethyl vinyl ether (PMVE) were added. The reaction was initiated by adding 15 grams of ammonium persulfate (APS) dissolved in 110 ml of deionized water. At a pressure of 12 bar and a temperature of 70°C, 23 grams of TFE and 14 grams of PMVE were fed in 363 minutes. The solid content of the formed latex is 4.3%, and with MgCl 2 The solution coagulates. The polymer was dried at 130°C.

[0069] FT-IR analysis showed a significant amount of nitrile functional groups (at 2262 cm -1 peak). Following the above method, a value of 0.039 was obtained.

Embodiment 2

[0071] Put 2900ml of deionized water into a 4 liter reactor. Add 9 grams of C 7 f 15 COONH 4 (APFO) and 6 grams of KSCN. After heating to 70°C, 94 grams of TFE and 243 grams of perfluoromethyl vinyl ether (PMVE) were added. The reaction was initiated by adding 6 grams of ammonium persulfate (APS) dissolved in 50 ml of deionized water.

[0072] At a pressure of 16 bar and a temperature of 70°C, 490 grams of TFE and 418 grams of PMVE were fed in 404 minutes. The solid content of the formed latex is 21.6%, and with MgCl 2 The solution coagulates. The polymer was dried at 130°C.

[0073] FT-IR analysis of the nitrile end group value of the isolated polymer showed a significant amount of nitrile functionality (at 2262 cm -1 peak). Following the above method, a value of 0.008 was obtained.

[0074] The Mooney (1+10@121°C) viscosity is 99.

Embodiment 3

[0076] Put 2700ml of deionized water into a 4 liter reactor. Add 9 grams of APFO and 5 grams of KOCN. After heating to 70°C, 97 grams of TFE and 253 grams of PMVE were added. The reaction was initiated by adding 6 g of APS dissolved in 50 ml of deionized water. At a pressure of 12 bar and a temperature of 70°C, 51 grams of TFE and 43 grams of PMVE were fed in 73 minutes. The solids content of the formed latex was 5.1%. The polymer was dried at 130°C.

[0077] FT-IR analysis showed a nitrile end group value of 0.067.

[0078] The Mooney (1+10@121°C) viscosity is 39.2.

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Abstract

The present invention discloses a process for making a fluoropolymer having nitrile endgroups. The process comprises a free radical polymerization of one or more fluorinated monomers in the presence of a nitrile group containing salt or a nitrile group containing pseudohalogen compound.

Description

field of invention [0001] This invention relates to a process for the preparation of fluoropolymers having nitrile end groups. Background of the invention [0002] Fluoropolymers, ie, polymers with a fluorinated backbone, are used in various applications due to their several desirable properties, such as heat resistance, chemical resistance, weather resistance, and UV-stability, among others. Various examples are described in "Modern Fluoropolymers", edited by John Scheirs, Wiley Science 1997. [0003] Known fluoropolymers include fluoroelastomers and fluorothermoplastics. Such fluoropolymers are typically gaseous fluorinated olefins such as tetrafluoroethylene (TFE), chlorotrifluoroethylene (CTFE) and / or vinylidene fluoride (VDF) with one or more comonomers such as hexafluoropropylene ( HFP) or perfluorovinyl ether (PVE) or copolymers of non-fluorinated olefins such as ethylene (E) and propylene (P). Examples of fluoroelastomers include copolymers of TFE and PVE and copo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/00C08F14/18C08F16/24C08F214/18
CPCC08F14/18C08F16/24C08F214/18C08F2/22C08F8/30C08F8/00C08F2/00
Inventor W·M·A·格罗托尔特K·亨特泽K·H·洛赫哈斯G·娄尔F·梅尔茨
Owner 3M INNOVATIVE PROPERTIES CO
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