Copolyetherimides and process of preparation

Details Copolyetherimides and process of preparation Copolyetherimides and process of preparation

1983-12-05

1985-03-12

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528128, 528172, 528179, C08G 7310

Patent

active

045046506

ABSTRACT:
Copolyetherimides having random units in the structure and characterized by good transparency after molding are prepared by a process in which a dianhydride and a diamine are reacted at a temperature of at least 100.degree. C. to initiate polymerization, followed by the addition of a second anhydride and continuing the polymerization at the elevated temperature. Preferred features include conducting the reaction in a solvent and in the presence of a chain stopper, such as phthalic anhydride.

REFERENCES:
patent: 3699075 (1972-10-01), Lubowitz
patent: 3803085 (1974-04-01), Takekoshi et al.
patent: 3833546 (1974-09-01), Takekoshi et al.
patent: 3847867 (1974-11-01), Heath et al.
patent: 3850885 (1974-11-01), Takekoshi et al.
patent: 3875116 (1975-04-01), Heath et al.
patent: 3917643 (1975-11-01), Takekoshi et al.
patent: 3983093 (1976-09-01), Williams et al.

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