Aromatic diamines and polyimides based on 4,4'-bis-(4-aminopheno

Details Aromatic diamines and polyimides based on 4,4'-bis-(4-aminopheno Aromatic diamines and polyimides based on 4,4'-bis-(4-aminopheno

1998-12-24

2000-03-14

O'Sullivan, Peter

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

528125, 528128, 528170, 528172, 528173, 528174, 528175, 528179, 528183, 528185, 528188, 528220, 528229, 528350, 528353, C07C21790

Patent

active

060374993

ABSTRACT:
This invention relates the novel diamines, the polyimide oligomers and the polyimides derived therefrom and to the method of preparing the diamines, oligomers and the polyimides. The thermoplastic polyimides derived from the aromatic diamines of this invention are characterized as having a high glass transition temperature, good mechanical properties and improved processability in the manufacture of adhesives, electronic and composite materials for use in the automotive and aerospace industry. The distinction of the novel aromatic diamines of this invention is the 2,2',6,6'-substituted biphenyl radicals which exhibit noncoplanar conformation that enhances the solubility of the diamine as well as the processability of the polyimides, while retaining a realatively high glass transition temperature and improved mechanical properties at useful temperature ranges.

REFERENCES:
patent: 3745149 (1973-07-01), Serafini et al.
patent: 5091505 (1992-02-01), Serafini et al.
patent: 5322924 (1994-06-01), Chuang et al.
patent: 5844065 (1998-12-01), Liaw et al.

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