The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1998
Filed:
Nov. 16, 1994
Michael-Joachim Brekner, Frankfurt am Main, DE;
Dietmar Jungbauer, Weiterstadt, DE;
Hoechst Aktiengesellschaft, Frankfurt, DE;
Abstract
A substrate for liquid-crystal displays is formed from polymers of polycyclic olefins by polymerization, without ring opening, of at least one monomer of the formula (I), (II), (III), (IV), (V) or (VI). The novel use of cycloolefin copolymers as substrate material facilitates process temperatures of above 180.degree. C. in the production of displays. Cycloolefin copolymers are lighter and less brittle than glass. Compared with other plastics, they have advantages in photoelastic constants, thermal expansion, hardness, density, transparency, water absorption and with respect to birefringence. Furthermore, they have high resistance to polar solvents.