Patent ID: 11905383
Assignee: TOPPAN PRINTING CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 12:
13. The gas barrier film of claim 8, wherein,
when a position at a depth of 10% of the thickness of the gas barrier layer from the first surface of the gas barrier layer in a cross-section of the gas barrier layer in the thickness direction is defined as a first position, and a position at a depth of 10% of the thickness of the gas barrier layer in the direction from a first surface of the substrate toward the first surface of the gas barrier layer in a cross-section of the gas barrier layer in the thickness direction is defined as a second position;
a square region having a side length from the first position to the second position is defined as a measurement target region;
ten of the square regions with intervals therebetween in the length direction perpendicular to the thickness direction of the gas barrier layer are selected to define a second measurement target region group composed of the ten of the measurement target regions;
a standard deviation of a luminance projection (β) in the length direction is obtained in each of the ten of the measurement target regions in the second measurement target region group; and
an arithmetic mean of a plurality of the standard deviations of the ten of the luminance projections (β) in the second measurement target region group is obtained as an average,
the average of the plurality of the standard deviations of the ten of the luminance projections (β) in the second measurement target region group in the gas barrier layer is 2.90 or less.