Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1993-06-04
1994-09-06
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528125, 528128, 528172, 528173, 528176, 528185, 528188, 528220, 528229, 528350, 359 73, 359 63, 359 93, 428 1, 4284735, C08G 7310, C08G 6926, C09K 1900, G02F 1133
Patent
active
053449169
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.
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Frank W. Harris & Raymond B. Seymour "Structure-Solubility Relationships in Polymers"-22 pp., Aug. 30-Sep. 3, 1976, Proceedings of Symposium on Structure-Solubility Relationships in Polymers held by the American Chemical Society in San Francisco, Calif.
Cheng Stephen Z. D.
Harris Frank W.
Hampton-Hightower P.
Kight III John
The University of Akron
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