LIQUID CRYSTAL LIGHT CONTROL ELEMENT AND PROCESS FOR PRODUCING THE LIQUID CRYSTAL LIGHT CONTROL ELEMENT
申请人:Nippon Sheet Glass Company Limited
公开号:EP2224279A1
公开(公告)日:2010-09-01
In the production method of the present invention, an emulsion including a copolymer with a glass transition temperature (Tg) of -50 to 20°C is obtained by the emulsion polymerization of a monomer group including a monomer A that is a (meth)acrylic acid alkyl ester (where the alkyl group is an open chain group with 1 to 20 carbon atoms or a cyclic group with 5 to 20 carbon atoms) as the main monomer and a monomer B having a carbon-carbon double bond and a nonionic hydrophilic group such as a polyoxyalkylene group, an amide group, and a hydroxyl group. Liquid crystals are dispersed in this emulsion, which is applied onto a conductive film-coated substrate. Another conductive film-coated substrate is laminated thereto, and thus a liquid crystal light control device is obtained. A monomer C having a carboxyl group and/or an amino group and a carbon-carbon double bond may be used in combination with a crosslinking agent so that a crosslinked structure is introduced into the copolymer. The present invention provides a liquid crystal light control device in which the transparency with a voltage applied and the shielding property with no voltage applied are compatible at high level.
在本发明的生产方法中一种包括玻璃化转变温度(Tg)为 -50 至 20°C 的共聚物的乳液,是由包括作为主单体的(甲基)丙烯酸烷基酯(其中烷基是具有 1 至 20 个碳原子的开链基团或具有 5 至 20 个碳原子的环状基团)的单体 A 和具有碳碳双键和非离子亲水基团(如聚氧烷基、酰胺基和羟基)的单体 B 的乳液聚合而成。液晶分散在这种乳液中,然后涂在涂有导电薄膜的基底上。将另一种涂有导电薄膜的基底层压在上面,就得到了液晶光控制装置。具有羧基和/或氨基以及碳碳双键的单体 C 可与交联剂结合使用,从而在共聚物中引入交联结构。本发明提供了一种液晶光控制装置,在该装置中,加电压时的透明性和不加电压时的屏蔽性在高水平上兼容。