专利名称：Method for the preparation of polarizing
films or sheets
发明人：Kiyoshi Imada,Susumu Ueno,Yasuhide
Nishina,Hirokazu Nomura
申请号：US06/168082申请日：19800710公开号：US04293585A公开日：19811006
摘要：The invention provides a novel method for the preparation of a polarizing filmor sheet based on a polyvinyl alcohol which is easily prepared and easy to handle. Theinventive method comprises first subjecting a substrate film or sheet of a vinyl chlorideresin to exposure to low temperature plasma, the surface of the substrate is coated withan aqueous solution of a polyvinyl alcohol and dried so as that a coating layer of thepolyvinyl alcohol is formed as firmly bonded to the substrate surface owing to theincreased affinity of the surface by the plasma treatment, the thus polyvinyl alcohol-cladsubstrate is stretched as such unidirectionally and the stretched polyvinyl alcohol layer istreated with iodine to be imparted with a polarizing power. The adhesion between thesubstrate and the polyvinyl alcohol layer is so strong without an adhesive agent that thedifficulty in the prior art in handling fragile stretched polyvinyl alcohol film is completelyovercome.
申请人：SHIN-ETSU CHEMICAL CO., LTD.
代理机构：Toren, McGeady and Stanger
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