| 摘要 |
PURPOSE:To obtain the titled film having a high polarizing property and excellent heat resisting and antimoisture properties and a high light permeability by forming an uniaxially oriented polyester film composed of a polyester copolymerized a dichroic dyestuff in a main chain of the copolymer as a main component. CONSTITUTION:The titled film is composed of the uniaxially oriented polyester film copolymerized the dichroic dyestuff as the main component. Said polyester is a high polymer compd. contg. an polyester binding -COO- which is obtd. by polycondensating a dicarboxylic acid component and a diol in a repeating unit of the polymer, as the main component, and including the dichroic dyestuff as a copolymerization component in the main chain. The main component of the polyester comprises preferably the aromatic polyester. The limiting viscosity number of eta of said polyester is preferably >=0.4 (weight average molecular weight is >=12,000). The glass transition temp. Tg of the polyester is preferably >=100 deg.C. The compounding ratio of the dichroic dyestuff to the copolymer is 0.005-10mol%. The titled polyester having not only the excellent polarizing property, especially, under a high temp. and humidity, but also the excellent characteristics such as the copolymerizability, the handling, the film forming and the drawing properties of the copolymer is obtd.
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