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AssigneeGeneral Electric Company
InventorsFarid Fouad Khouri, Ganesh Kailasam, Joseph John Caringi, Peter David Phelps, Paul Edward Howson
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Bis(halophthalimides) such as, 3-bis[N-(4-chlorophthalimido)]benzene are prepared in slurry in an organic liquid such as o-dichlorobenzene or anisole, by a reaction at a temperature of at least 150° C. between at least one diamino compound, preferably an aromatic diamine such as m- or p-phenylenediamine, and at least one halophthalic anhydride such as 4-chlorophthalic anhydride, in the presence of an imidization catalyst such as sodium phenylphosphinate. The solids content of the reaction mixture is at least about 5% and preferably at least about 12% by weight. The product slurry may be employed directly in the preparation of polyetherimides, and similar slurries may be employed to prepare other polyether polymers.
A method for preparing a bis(halophthalimide) in organic slurry form which comprises effecting contact at a temperature of at least 100° C. between the constituents of a mixture comprising at least one diamino compound, at least one halophthalic anhydride, an organic liquid having a polarity no higher than that of o-dichlorobenzene, dichlorotoluene, 1,2,4-trichlorobenzene, diphenyl sulfone and anisole;
A method for preparing 1,3-bis[N-(4-chlorophthalimido)]benzene in organic slurry form which comprises effecting contact at a temperature in the range of about 175-225° C. between the constituents of a mixture comprising at least m-phenylenediamine or a mixture thereof with p-phenylenediamine, 4-chlorophthalic anhydride, an imidization catalyst and o-dichlorobenzene or anisole, said mixture having a solids content in the range of about 15-25% by weight, thereby producing a slurry of said bis(halophthalimide) in said o-dichlorobenzene or anisole.
A method for preparing an aromatic polyether polymer which comprises contacting, in at least one organic liquid as diluent, substantially equimolar amounts of at least one alkali metal salt of a dihydroxy-substituted aromatic hydrocarbon and a slurry in said organic liquid of at least one substituted aromatic compound of the formula
A method for preparing a polyetherimide which comprises contacting, in o-dichlorobenzene or anisole as diluent, substantially equimolar amounts of bisphenol A disodium salt and a slurry in said o-dichlorobenzene or anisole of 1,3-bis[N-(4-chlorophthalimido)]benzene, in the presence of a catalytically active amount of a hexaalkylguanidinium chloride as a phase transfer catalyst;
Dependencies are inferred from the claim text.