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US 7,351,362 B2Granted
Photochromic material
AssigneeThe Pilot Ink Co., Ltd.
InventorsMichiyuki Yasuda, Jun Sugai, Fumihiro Kimura
Life of this patent
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Abstract
A photochromic material comprising a styrene-based oligomer having a weight average molecular weight of from 200 to 6000 and a photochromic compound selected from the group consisting of spirooxazine derivatives and spiropyran derivatives.
Claims8
A photochromic material comprising a mixture of a styrene-based oligomer having a weight average molecular weight of from 200 to 6000 and a photochromic compound selected from the group consisting of spirooxazine derivatives and spiropyran derivatives, wherein the photochromic compound is dissolved in the styrene-based oligomer.
Dependencies are inferred from the claim text.