US 9,776,983 B2 · Method for manufacturing fluoropolymers

Abstract

The invention pertains to a method for making a fluoropolymer comprising an aqueous emulsion polymerization of one or more fluorinated monomers wherein said aqueous emulsion polymerization is carried out in the presence of at least one cyclic fluorocompound of the following formula (I): wherein X1, X2, X3, equal or different from each other are independently selected among H, F, and C1-6 (per)fluoroalkyl groups, optionally comprising one or more catenary or non-catenary oxygen atoms; L represents a bond or a divalent group; RF is a divalent fluorinated C1-3 bridging group; Y is a hydrophilic function selected among anionic functionalities, cationic functionalities and non-ionic functionalities.

Claims4

Dependent claims

A cyclic fluorocompound complying with formula (VIII) here below:

wherein RF is a divalent fluorinated C1-3 bridging group;
Xa is H, a monovalent metal or an ammonium group of formula —N(R′n)4, wherein R′n, equal or different at each occurrence, represents a hydrogen atom or a C1-6 hydrocarbon group;
X*1, X*2 equal to or different from each other are independently a fluorine atom, —R′f or —OR′f, wherein R′f is a C1-3 perfluoroalkyl group;
RF1 is F or CF3;
k is an integer from 1 to 3.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/198,443Filed 5 Mar 2014 · division

Priority

EP 081599368 Jul 2008

Published

US 2014/0228531 A114 Aug 2014

Granted

3 Oct 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

C07D 317/34
With hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals,…:…
C07D 317/42
With hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals,…:…
C08F 14/18
Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond,…
C08F 114/26
Monomers containing fluorine: tetrafluoroethene

Family

PCT/EP2009/058530Parent of this division · filed 6 Jul 2009

US 2014/0228531 A1Pre-grant publication · published 14 Aug 2014

Application13/002,781Parent of this division

US 8,703,889 B2Parent of this division

US 2011/0160415 A1Published application

US 9,776,983 B2This patent

From the US filing history. Foreign family members aren’t listed.

Method for manufacturing fluoropolymers

Life of this patent

Method for manufacturing fluoropolymers

Life of this patent

Abstract

Claims4