Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,...
Patent
1995-04-24
1998-04-21
Acquah, Samuel A.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
528312, 528314, 528316, 528317, 528318, 528321, 528351, 528352, 528353, 528481, 528492, 528493, 528503, 524233, 524717, 524726, 428357, 4284735, B29D 2200, C08G 6308
Patent
active
057415854
ABSTRACT:
Polyimide precursor solutions comprise an organic liquid and the reaction product of an aromatic dianhydride and an aromatic diaminobenzoxazole capped, on at least one terminal end, with a bifunctional chain extender. The bifunctional chain extender has one functional group reactive with the amine of the aromatic diaminobenzoxazole or the anhydride of the aromatic dianhydride and another functional group which does not form amic acid linkages, but which is capable of further reaction to increase the molecular weight of the polyimide precursor under conditions other than those used to react the aromatic diamine and aromatic dianhydride to form the polyimide precursor. These polyimide precursors can be converted into polyimidebenzoxazole polymers.
REFERENCES:
patent: 4087409 (1978-05-01), Preston
patent: 4866873 (1989-09-01), Van Valkenburg
patent: 5145916 (1992-09-01), Yamamoto et al.
Harris William J.
Hwang Wen-Fang
Acquah Samuel A.
Nilsen Kevin J.
The Dow Chemical Company
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