Melt polymerization method for making polyetherimides

Details Melt polymerization method for making polyetherimides Melt polymerization method for making polyetherimides

1976-12-30

1978-02-14

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 465E, 260 49, 260 78TF, 264349, C08G 7310

Patent

active

040737730

ABSTRACT:
An improved extrusion melt polymerization method for continuously making polyetherimides is disclosed wherein a mixture of an organic diamine and an aromatic bis(ether anhydride) is continuously fed through an inlet opening into a screw extruder having a second opening downstream from the inlet opening. The mixture is passed through a first extruder zone maintained at a low temperature to a zone where the mixture is melted and water of reaction is continuously removed through the second opening. A melt seal may be employed between the second opening and a third opening through which water of reaction may be removed under vacuum.

REFERENCES:
patent: 3803085 (1974-04-01), Takekoshi et al.
patent: 3833546 (1974-09-01), Takekoshi et al.
patent: 4011198 (1977-03-01), Takekoshi et al.

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