Process for the preparation of thermoplastic poly(hydroxy ethers)
AssigneeThe Dow Chemical Company
InventorsJoseph A. Schomaker, Jerry E. White, Anthony P. Haag, Ha Q. Pham
Life of this patent
Estimating the term…
Abstract
Poly(hydroxy ethers) are prepared by reacting a dihydric phenol with a diepoxide in the presence of a catalyst selected from the group consisting of bis(trihydrocarbylphosphoranylidene)ammonium salt, bis[tris(dihydrocarbylamino)phosphoranylidene]ammonium salt, and tetrakis[tris(dihydrocarbylamino)phosphoranylideneamino]phosphonium salt. The reaction between the dihydric phenol and the diepoxide is conducted in an ether or hydroxy ether solvent at a temperature sufficiently high to produce a poly(hydroxy ether). Polymers prepared by the new process are more highly branched than those produced by known methods.
Claims12
A process for preparing a thermoplastic poly(hydroxy ether) which comprises reacting a dihydric phenol with a diepoxide in the presence of from about 0.001 to about 10 mol percent, based on the number of moles of dihydric phenol in the reaction mixture, of a catalyst selected from the group consisting of bis(trihydrocarbylphosphoranylidene)ammonium salt, bis(tris(dihydrocarbylamino)phosphoranylidene)ammonium salt, and tetrakis(tris(dihydrocarbylamino)phosphoranylideneamino)phosphonium salt, in an ether or hydroxy ether solvent selected from the group consisting of diglyme, triglyme, diethylene glycol ethyl ether, diethylene glycol methyl ether, dipropylene glycol methyl ether, ethylene glycol n-butyl ether, ethylene glycol ethyl ether, ethylene glycol methyl ether, ethylene glycol phenyl ether, propylene glycol phenyl ether, propylene glycol methyl ether and tripropylene glycol methyl ether at a temperature sufficiently high to produce a poly(hydroxy ether), the solvent being present in an amount sufficient to dissolve the thermoplastic poly(hydroxy ether).
Dependencies are inferred from the claim text.