| Patent Number |
Title Of Patent |
Date Issued |
| 4116939 |
Intrinsic viscosity control of polyphenylene ether reaction mixtures |
September 26, 1978 |
| Polyphenylene ethers produced by an oxidative coupling of a phenol in the presence of an oxygen-containing gas and a metal-amine complex catalyst are freed of catalyst and stabilized against molecular weight loss. Removal of the metal component and molecular weight loss control are e |
| 4071500 |
Process for recovery of catalyst from polymerization of polyphenylene ethers |
January 31, 1978 |
| A process for the recovery of copper catalyst from the polymerization of polyphenylene ethers comprises forming a complex of the catalyst and an amino acid chelating agent, separating the complex from the polymerization mixture, contacting the complex with a reducing sugar in an alkaline |
| 4039510 |
Removal of catalyst from polyphenylene oxide reaction mixtures with nitrogenous salts of nitrilo |
August 2, 1977 |
| A novel process is disclosed for the removal of catalyst residues from organic solutions of polyphenylene oxides. The process comprises adding a nitrogenous salt of nitrilotriacetic acid to a polyphenylene oxide reaction mixture and thereafter adding an antisolvent for polyphenylene |
| 4026870 |
Extraction of copper catalyst from polyphenylene oxide solutions |
May 31, 1977 |
| A novel process is disclosed for the preparation of a polyphenylene oxide resin wherein the copper catalyst is extracted by the use of a salt of ethylenediaminetetraacetic acid and a quaternary ammonium salt. The process results in a decrease of the residual copper which is carried over |
| 3994859 |
Catalyst removal from polyphenylene ether reaction solutions by bisulfate extraction |
November 30, 1976 |
| A novel process for the separation of catalyst residues from polyphenylene ether reaction systems is disclosed. The process is based on the discovery that an aqueous solution of a water soluble bisulfate will extract a complex copper-amine catalyst from a reaction solution of a polypheny |
| 3988298 |
Catalyst removal from polyphenylene oxides by ammonia and carbon dioxide |
October 26, 1976 |
| This invention provides a novel method for the removal of the catalyst from a polyphenylene oxide polymerization mixture. The novel method is based on the discovery that ammonia and carbon dioxide may be employed to extract the catalyst from a polyphenylene ether reaction mixture. |
| 3984374 |
Catalyst removal from polyphenylene ether reaction solutions by aqueous extraction with ammonium |
October 5, 1976 |
| A novel process for the separation of catalyst residues from polyphenylene ether reaction systems is disclosed. The process is based on the discovery that an aqueous solution of an ammonium salt will extract copper from a reaction solution of a polyphenylene ether resin and a complex |
| 3933536 |
Method of making magnets by polymer-coating magnetic powder |
January 20, 1976 |
| Magnets are produced by dissolving in a solvent organic polymer which is a binder for magnetic powder, adding a magnetic powder to the solution, then adding to the solution a vehicle in which the polymer is insoluble. The vehicle is added until the polymer has precipitated onto the magne |
