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Method of manufacturing fluoroelastomers

A fluoroelastomer and monomer technology, applied in the field of fluoroelastomer manufacturing, can solve problems such as large capital expenditures

Active Publication Date: 2018-10-23
SOLVAY SOLEXIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Consequently, substantial capital expenditures are required to provide plant layouts, and more specifically, reactor systems capable of producing (per)fluoroelastomers

Method used

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  • Method of manufacturing fluoroelastomers
  • Method of manufacturing fluoroelastomers
  • Method of manufacturing fluoroelastomers

Examples

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example 1

[0180] Example 1a - Preparation of Prepolymer Latex

[0181] In a 10 liter reactor equipped with a mechanical stirrer operating at 545 rpm, 5.4 1 of demineralized water and 175 ml of the microemulsion obtained previously by mixing: 38.5 ml of Perfluoropolyoxyalkylene (with an average molecular weight of 600) with acidic end groups: CF 2 ClO(CF 2 -CF(CF 3 )O) n (CF 2 O) m CF 2 COOH (wherein n / m=10), 24.6ml of 30% v / v NH4OH aqueous solution, 87.7ml of demineralized water and 24.2ml of D02 perfluoropolyether (with an average molecular weight of 450): CF 3 O(CF 2 CF(CF 3 )O) n (CF 2 O) m CF 3 (where n / m=20).

[0182] The reactor was heated and maintained at a set point temperature of 80°C; a mixture of vinylidene fluoride (VDF) (78.5% moles) and hexafluoropropylene (HFP) (21.5% moles) was then added to achieve a final pressure of 25 bar . Then 102 g of 1,4-diiodoperfluorobutane (C 4 f 8 I 2 ), and 2.0 g of ammonium persulfate (APS) was introduced as an initia...

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Abstract

The invention pertains to a method for manufacturing a (per)fluoroelastomer [fluoroelastomer (A)] comprising the following steps: step (a): polymerizing in an aqueous emulsion in the presence of a surfactant by feeding in a first reactor comprising feeding the following ingredients: (i) a monomer mixture [mixture (M1)] comprising at least one fluoromonomer [monomer (F)], (ii) at least one iodinated and / or brominated chain-transfer agent(s), (iii) at least one branching agent possessing at least two ethylenic unsaturations; and (iv) at least one radical initiator, so as to obtain a pre-polymerlatex [latex (P)]; step (b): recovering the said latex (P) from the said first reactor and storing the same in a storage tank; and step (c): feeding the said latex (P) from the said storage tank to asecond reactor; step (d): polymerizing in the said second reactor at least a second monomer mixture [mixture (M2)] comprising at least one monomer (F) in the presence of a radical initiator, so as toobtain a final latex [latex (F)]; and step (d): recovering the (per)fluoroelastomer from the said latex (F).

Description

[0001] Cross References to Related Applications [0002] This application claims priority from European Application No. 15199930.7 filed on December 14, 2015, the entire content of said application being incorporated by reference into this application for all purposes. technical field [0003] The present invention relates to a process for the manufacture of (per)fluoroelastomers. Background technique [0004] Cured (per)fluoroelastomers are materials characterized by excellent heat and chemical resistance, and they are generally used in the manufacture of various technical objects, such as sealing parts, tubes, oil seals and O-rings, where the Ensuring tightness, mechanical properties and resistance to a wide variety of substances such as mineral oils, hydraulic fluids, solvents or chemical agents with different properties over a wide operating temperature range from low to high temperatures. [0005] To ensure compliance with all these requirements, it is recognized that ...

Claims

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Application Information

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IPC IPC(8): C08F214/26
CPCC08F214/262C08F2/24C08F2/38C08F259/08C08F214/222C08F2500/02C08F2500/03C08F2500/21C08F2800/20
Inventor M.多西M.阿瓦塔內奧
Owner SOLVAY SOLEXIS