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US 2026/0297252 A1Published application
Halomethylated polyphenylene ether and method for the manufacture thereof
AssigneeShpp Global Technologies B.V.
InventorsVijay Raghavan, Shubashree Swaminathan, Rajesh Chowdhury, Jaykisor Pal, Shadaksharaswamy Puttamadappa, Debasish Banerjee, Manesh Vs
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Abstract
A halomethylated polyphenylene ether includes particular amounts of repeating units of the Formulae (I) (II) (III) wherein X is chlorine or bromine. The halomethylated polyphenylene ether can be particularly well suited for subsequent quaternization. Use of the materials described herein in applications such as ion exchange membranes is also described.
Claims17
A halomethylated polyphenylene ether comprising
- 35 to 89 mole percent of a first repeating unit of formula (I)
- 10 to 65 mole percent of a second repeating unit of formula (II)
- and
- 1 mole percent or less of a third repeating unit of formula (III)
- wherein X in Formula (II) is bromine or chlorine;
- wherein at least 90% of halomethylated repeat units are monohalomethylated repeating units of Formula (II), as determined by nuclear magnetic resonance spectroscopy;
- and
- wherein the halomethylated polyphenylene ether has a residual zinc content of less than 1000 ppm, based on the total weight of the halomethylated polyphenylene ether.
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A method for the manufacture of a halomethylated polyphenylene ether, the method comprising:
- contacting a polyphenylene ether with chloromethyl ethyl ether to provide a mixture comprising a chloromethylated polyphenylene ether or contacting a polyphenylene ether with bromomethyl methyl ether to provide a bromomethylated polyphenylene ether;
- and
- isolating the halomethylated polyphenylene ether from the mixture;
- wherein isolating the halomethylated polyphenylene ether comprises:
- precipitating the halomethylated polyphenylene ether from the mixture in an antisolvent;
- filtering the precipitated halomethylated polyphenylene ether;
- washing the halomethylated polyphenylene ether;
- and
- dissolving the filtered halomethylated polyphenylene ether in a solvent to provide a purified halomethylated polyphenylene ether solution, and adding a chelating agent, an ion exchange resin, carbonaceous material, or a combination thereof to the purified halomethylated polyphenylene ether solution.
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Dependencies are inferred from the claim text.