Polyimidesiloxane extended block copolymers

Details Polyimidesiloxane extended block copolymers Polyimidesiloxane extended block copolymers

1991-06-13

1993-05-11

Bleutge, John C.

Stock material or miscellaneous articles

Composite

Of silicon containing

525431, 528 26, 528 38, B32B 904

Patent

active

052099814

ABSTRACT:
Disclosed is method of making a polyimidesiloxane extended block copolymer containing at least one polyimide block made by reacting a dianhydride with a diamine that does not contain a siloxane group, and at least one polyimidesiloxane block made by reacting a dianhydride with a diamine that contains at least one siloxane group, where each polyimidesiloxane block is prepared using more than one mole of the dianhydride for each mole of the siloxane-containing diamine. That is, any siloxane-imide blocks in the polyimidesiloxane are formed from amic acid blocks terminated in anhydride groups and any imide blocks in the polyimidesiloxane are formed from amic acid blocks terminated in amine groups. The polyimidesiloxane block copolymers have higher glass transition temperatures than the corresponding non-extended block copolymers while retaining the same solubility.

REFERENCES:
patent: 4558110 (1985-12-01), Lee
patent: 4586997 (1986-05-01), Lee
patent: 4829131 (1989-05-01), Lee
patent: 5094919 (1992-03-01), Yamada et al.

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