Polyetherimide preparation method including addition of macrocyc

Details Polyetherimide preparation method including addition of macrocyc Polyetherimide preparation method including addition of macrocyc

1997-03-17

1999-01-05

Cooney, Jr., John M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528126, 528170, C08G 1710

Patent

active

058564217

ABSTRACT:
Macrocyclic polyether oligomers, preferably as mixtures of oligomers of different degrees of polymerization, are incorporated in a direct displacement reaction mixture for the formation of polyetherimides, said reaction mixture comprising at least one alkali metal salt of a dihydroxy-substituted aromatic hydrocarbon and at least one bis(halo- or nitrophthalimide). The macrocyclic oligomers can be isolated from an earlier-prepared linear polyetherimide composition. Their incorporation in the reaction mixture does not increase the proportion of oligomers in the polyetherimide product.

REFERENCES:
patent: 4054577 (1977-10-01), Relles et al.
patent: 5229482 (1993-07-01), Brunelle
patent: 5357029 (1994-10-01), Takekoshi et al.
patent: 5514813 (1996-05-01), Brunelle
European Search Report, Jun. 1998.

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