Abstract:
A process for making ortho-alkylated phenols by reacting in the vapor phase an alkyl alcohol and a phenolic compound in the presence of an alkylation catalyst, said catalyst provided by a calcination residue of mixture comprising a magnesium-containing material and manganese hydroxide formed as a precipitate by bringing together an aqueous solution of a manganese salt and an aqueous solution of ammonium hydroxide in the presence of said magnesium-containing material.
Abstract:
A novel process is provided for preparing a blend of a polyphenylene ether resin and an alkenyl aromatic addition polymer which comprises using an alkenyl aromatic monomer as a solvent for the oxidative coupling of a phenol to form a polyphenylene ether resin and thereafter polymerizing the alkenyl aromatic monomer to form said blend of alkenyl aromatic addition polymer and a polyphenylene ether resin.
Abstract:
The invention provides a process for producing a polyphenylene ether by subjecting a 2,6-dialkyl-4-halophenol to oxygen in the presence of a water-immiscible solvent, an aqueous alkali, a phase transfer agent, and a molecular-weight-controlling amount of an amine having at least one hydrogen on the amine nitrogen. The polyphenylene ether thus produced has improved flow properties, color and odor, and is suitable for polymer blending with styrenic resins.
Abstract:
Ortho-alkylated phenols are prepared by reacting phenol unsubstituted in at least one ortho position with an alcohol in the presence of an ortho-alkylation catalyst consisting of magnesium carbonate, magnesium hydroxide or a mixture of both. The catalyst is used in the absence of a promoter compound and with or without polymeric binder.
Abstract:
A catalyst precursor comprising a magnesium compound or material, optionally also containing other metal compounds, is activated for use by calcining at an elevated temperature in the presence of air or nitrogen, or under vacuum. The active catalyst which results may be used in processes for the ortho-alkylation of phenolic compounds, with good yields of and selectivity to the ortho-alkylated end product.
Abstract:
Hydroxyaromatic compounds such as phenol are alkylated with alkanols such as methanol in the presence of a catalyst comprising magnesium oxide with up to about 0.1% by weight of copper deposited thereon in a layer of submicroscopic thickness. The catalyst is prepared by preparing a slurry of a substantially water-insoluble magnesium reagent such as magnesium hydroxide or magnesium carbonate in an aqueous solution of at least one copper salt, removing and drying the solid phase, and calcining the same at a temperature within the range of about 350.degree.-550.degree. C. The catalyst promotes ortho-alkylation of the hydroxyaromatic compound in high yield, minimizes decomposition of the alkanol, and has long life.
Abstract:
Disclosed are a catalyst comprising a magnesium-containing moiety, a method for preparing the catalyst, and a process for the vapor phase ortho-alkylation of phenols in the presence of the catalyst.
Abstract:
There are provided thermoplastic compositions comprising a polyphenylene ether and a rubber modified polystyrene resin having a discontinuous phase of polystyrene particles englobed in diene rubber membranes, the particles being between about 0.1 and 0.7 microns in diameter. Such compositions provide molded articles with substantial and unexpected improvements in impact resistance and ability to transmit light in comparison with known compositions of such rubber modified polystyrenes alone or those of other polystyrenes combined with polyphenylene ethers.
Abstract:
An improved process is disclosed for preparing polyphenylene ethers in which a polyamine complexing agent is employed to terminate the oxidative coupling reaction and to remove the metal component of the catalyst from the polymer.
Abstract:
An improved process is provided for preparing polyphenylene ethers by oxidatively coupling a di-ortho substituted phenolic precursor in a reaction system containing oxygen at a pressure of more than one atmosphere, and a complex catalyst formed from a cupric halide and a primary or secondary amine catalyst.