Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1994-04-21
1996-01-02
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528125, 528128, 528172, 528173, 528174, 528176, 528183, 528188, 528220, 528229, 528350, 528351, 4284735, C08G 7710, C08G 6926
Patent
active
054809649
ABSTRACT:
A negative birefringent film, useful in liquid crystal displays, and a method for controlling the negative birefringence of a polyimide film is disclosed which allows the matching of an application to a targeted amount of birefringence by controlling the degree of in-plane orientation of the polyimide by the selection of functional groups within both the diamine and dianhydride segments of the polyimide which affect the polyimide backbone chain rigidity, linearity, and symmetry. The higher the rigidity, linearity and symmetry of the polyimide backbone, the larger the value of the negative birefringence of the polyimide film.
REFERENCES:
patent: 5071997 (1991-12-01), Harris
patent: 5128782 (1992-07-01), Wood
patent: 5130827 (1992-07-01), Pavone et al.
patent: 5138474 (1992-08-01), Arakawa
patent: 5196953 (1993-03-01), Yeh et al.
patent: 5344916 (1994-09-01), Harris et al.
patent: 5395918 (1995-03-01), Harris et al.
Frank W. Harris and Raymond B. Seymour "Structure-Solubility Relationships in Polymers" Aug. 30-Sep. 3, 1976, pp. 183-214.
Cheng Stephen Z. D.
Harris Frank W.
Hampton-Hightower P.
The University of Akron
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