Process for making polyimide-polydiorganosiloxane block polymers

Details Process for making polyimide-polydiorganosiloxane block polymers Process for making polyimide-polydiorganosiloxane block polymers

1975-09-23

1977-03-08

Lieberman, Paul

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 37SB, 260 465E, C08L 8310

Patent

active

040112799

ABSTRACT:
A process is provided for making polyimides having chemically combined polydiorganosiloxane blocks. An excess organic dianhydride is contacted with an organic diamine in a refluxing halogenated aromatic hydrocarbon solvent in the presence of an acid catalyst to produce an intermediate polyimide product. The temperature of the mixture is thereafter lowered, and amino-terminated polydiorganosiloxane is added to the mixture to effect the incorporation of polydiorganosiloxane blocks into the polyimide. There is produced clear polyimide-polydiorganosiloxane block polymer useful as an insulating layer on semi-conductor devices.

REFERENCES:
patent: 3288754 (1966-11-01), Green
patent: 3325450 (1967-06-01), Holub
patent: 3598783 (1971-08-01), Holub
patent: 3598785 (1971-08-01), Holub
patent: 3736290 (1973-05-01), Fessler
patent: 3740305 (1973-06-01), Hoback
patent: 3773718 (1973-11-01), Klebe
patent: 3884868 (1975-05-01), Trice
patent: 3887636 (1975-06-01), Juliano
patent: 3926911 (1975-12-01), Greber

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