Polarizing film, method for manufacturing same, polarizing plate, and display device
AssigneeSumitomo Chemical Company, Limited
InventorsYosuke Ota, Nobuyuki Hatanaka
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Abstract
A polarizing film including a polarizer that is a cured product of a polymerizable liquid crystal composition is provided. The polymerizable liquid crystal composition contains both a polymerizable liquid crystal compound having at least one polymerizable group and a dichroic coloring matter. The polarizer is laminated on a surface, having a pore size of 0.45 nm to 0.57 nm, of a base material. The pore size is obtained by converting, into a diameter, an average free volume radius calculated by a positron lifetime measurement method in which the positron lifetime is measured by irradiating the surface with positrons with an injection energy of 3 kV.
Claims14
A polarizing film comprising a polarizer that is a cured product of a polymerizable liquid crystal composition containing both a polymerizable liquid crystal compound having at least one polymerizable group and a dichroic coloring matter, said polarizer being laminated on a surface, having a pore size of 0.53 nm to 0.57 nm, of a base material,
- the pore size being obtained by converting, into a diameter, an average free volume radius calculated by a positron lifetime measurement method in which the positron lifetime is measured by irradiating the surface with positrons with an injection energy of 3 kV.
A method for manufacturing a polarizing film, comprising:
- forming a coating film of a polymerizable liquid crystal composition containing both a polymerizable liquid crystal compound having at least one polymerizable group and a dichroic coloring matter on a surface, having a pore size of 0.53 nm to 0.57 nm, of a base material, the pore size being obtained by converting, into a diameter, an average free volume radius calculated by a positron lifetime measurement method in which the positron lifetime is measured by irradiating the surface with positrons with an injection energy of 3 kV;
- removing a solvent from the coating film;
- causing the polymerizable liquid crystal compound to make a phase transition to a smectic phase by heating the polymerizable liquid crystal compound to a temperature higher than or equal to a temperature at which the polymerizable liquid crystal compound makes a phase transition to a liquid phase and then by lowering the temperature;
- and
- polymerizing the polymerizable liquid crystal compound while maintaining the smectic phase.
Dependencies are inferred from the claim text.