Quaternary bisphenolates, methods for their preparation, and uses thereof
AssigneeGeneral Electric Company
InventorsJimmy Lynn Webb, Thomas Link Guggenheim, Robert Joseph Nick, Patrick Joseph McCloskey, Joseph Anthony King, Jr.
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Abstract
Quaternary salts having a double helix structure are prepared by the reaction of dihydroxyaromatic compound, preferably a bisphenol, with an alkali metal hydroxide and a quaternary salt, such as a tetraalkylammonium or hexaalkylguanidinium chloride. The quaternary salts and their alkaline hydrolysis products are useful as catalysts in various reactions, including imide formation from bisphenol salts and halo- or nitro-substituted phthalimides and redistribution and equilibration of polycarbonates.
Claims8
A method for preparing a polyether or intermediate therefor which comprises contacting, at a temperature in the range of about 100-250.degree. C., at least one alkali metal salt of a dihydroxyaromatic compound with at least one halo- or nitro- substituted aromatic compound in the presence of a catalytic amount of an alkaline hydrolysis product of a quarternary salt of a dihydroxyaromatic compound, the salt having the molecular formula
- H.sub.3 Q(OA.sup.1 O).sub.2, (I)
- wherein A.sup.1 is a divalent aromatic radical and Q is a monocationic carbon- and nitrogen- or phosphorous-containing moiety.
A method of preparing a polycarbonate which comprises equilibrating a reaction system comprising a linear or branched polycarbonate in the presence of a catalytic amount of a quaternary salt of a dihydroxyaromatic compound, the salt having the molecular formula
- H.sub.3 Q(OA.sup.1 O).sub.2, (I)
- wherein A.sup.1 is a divalent aromatic radical and Q is a monocationic carbon- and nitrogen- or phosphorous-containing moiety.
A method of preparing a polycarbonate which comprises contacting at least one dihydroxyaromatic compound with a diaryl carbonate In the melt in the presence of a catalytic amount of a quaternary salt of a dihydroxyaromatic compound, the salt having the molecular formula
- H.sub.3 Q(OA.sup.1 O).sub.2, (I)
- wherein A.sup.1 is a divalent aromatic radical and Q is a monocationic carbon- and nitrogen- or phosphorous-containing moiety.
Dependencies are inferred from the claim text.