Polarizing plate and method for producing polarizing plate
The present invention is to provide a polarizing plate including an alignment layer applicable to various types of substrates, and having excellent light polarization properties. A polarizing plate 1 of the present invention includes an alignment layer 3 , and a polarizing layer 4 disposed on the alignment layer 3 , and containing an organic dye having lyotropic liquid crystallinity, wherein the organic dye in the polarizing, layer 4 is in a form of supramolecular aggregates, and the alignment layer 3 contains a cycloolefin based resin.
1. A polarizing plate comprising:
a substrate;
an alignment layer disposed on the substrate; and
a polarizing layer disposed on the alignment layer, and containing an organic dye having lyotropic liquid crystallinity,
wherein the organic dye in the polarizing layer is in a form of supramolecular aggregates,
wherein the alignment layer is formed of a coating film containing a cycloolefin based resin and has a thickness of 2 μm to 10 μm, and
wherein the alignment layer has a surface on which a rubbing treatment has been performed.
2. The polarizing plate according to claim 1 , wherein the cycloolefin based resin is amorphous.
3. The polarizing plate according to claim 1 , wherein the cycloolefin based resin is a norbornene based resin.
4. The polarizing plate according to claim 1 , wherein the alignment layer is substantially optically isotropic.
5. The polarizing plate according to claim 1 , wherein the substrate is a resin film containing a resin, and the resin has a glass transition temperature (Tg) of 180° C. or less.
6. The polarizing plate according to claim 1 , wherein the substrate has a surface having releasability.
7. A method for producing a polarizing plate, comprising:
a step of applying a first coating liquid containing a cycloolefin based resin on a substrate to form a first coating film;
a step of drying the first coating film to form a first dry coating film;
a step of performing a rubbing treatment on a surface of the first dry coating film to form an alignment layer having a thickness of 2 μm to 10 μm;
a step of applying a second coating liquid containing an organic dye on a surface of the alignment layer on which the rubbing treatment has been performed to form a second coating film; and
a step of drying the second coating film to form a second dry coating film as a polarizing layer.