Patent ID: 11966008
Assignee: FUJIFILM CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  G  H | IPC C  G  H

Claim 0:
1. An optical film comprising:
an organic base material; and
a liquid crystal layer disposed on the organic base material,
wherein the liquid crystal layer includes a photo-alignment compound,
in the liquid crystal layer, the photo-alignment compound is unevenly distributed on a side of the organic base material, and
an uneven distribution degree obtained by an uneven distribution degree calculation method 1 is 2.0 or more,
wherein the uneven distribution calculation method 1 comprises:
in a case where a secondary ion intensity derived from the photo-alignment compound in the liquid crystal layer is measured by a time-of-flight secondary ion mass spectrometry while emitting an ion beam from a surface of the liquid crystal layer on a side opposite to the side of the organic base material toward the side of the organic base material and a region from the surface of the liquid crystal layer on the side opposite to the side of the organic base material to a depth position equivalent to 80% of a total thickness of the liquid crystal layer toward the side of the organic base material is denoted as an upper layer region, and a region from the depth position to a surface of the liquid crystal layer on the side of the organic base material is denoted as a lower layer region, a ratio of a maximum value IA1 of a secondary ion intensity derived from the photo-alignment compound in the lower layer region to an average value IA2 of a secondary ion intensity derived from the photo-alignment compound in the upper layer region is denoted as an uneven distribution degree.