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:
Jul. 07, 1998
Filed:
Apr. 24, 1996
AG Technology Co., Ltd., Yokohama, JP;
Abstract
To a bifunctional acrylurethane compound having acrylate groups at its both ends, which is a reaction product of polypropylene glycol, a mixture of 2,2,4-trimethyl-1, 6-diisocyanatohexane and 2,4,4-trimethy1-1, 6-diisocyanatohexane, and 2-hydroxyethyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, nematic liquid crystal and a photo-reaction initiator are mixed to obtain a uniformly dissolved mixture, and the mixture undergoes a phase separation treatment by photopolymerization to thereby form a liquid crystal/polymer composite material layer 7 which is utilized for a liquid crystal optical element 1. The phase separation by photo-polymerization improves controllability of the structure of the liquid crystal/polymer composite material layer. In particular, the shape of the polymer phase with respect to the liquid crystal phase is precisely controlled to adjust the optical characteristic performance of liquid crystal domains in a connected phase of liquid crystal; to improve the electro-optical characteristics in a low temperature region, and to obtain a display of high contrast and low hysteresis.