Tokai Optical Co., Ltd.

Miyoshi Oil & Fat Co., Ltd.

Yuichi Shishino

Koji Kawai

Kotaro Kaneko

Nobuhiro Kaneko

Kuniyoshi Okamoto

Shingo Ono

Provided is an additive for imparting ultraviolet absorbency, or an additive for imparting a high refractive index, which has satisfactory compatibility with a resin serving as a matrix and can maintain high transparency even if added in high concentrations. Also provided is an additive with which the function of imparting both ultraviolet absorbency and a high refractive index can be realized by means of one kind of additive. This additive is represented by the following Formula (I):

Additive for imparting ultraviolet absorbency and/or high refractive index to matrix, and resin member using same

To provide a plastic lens which can absorb light with a wavelength of 400 to 420 nm with sufficiently high efficiency but is reduced in the absorption of light with a wavelength of around 420 nm or longer, is less affected by harmful light, suppresses yellow coloration and therefore has excellent appearance, suppresses yellowish discoloration over time, and has excellent heat resistance, light resistance, and also optical performance, particularly an excellent Abbe's number. The plastic lens is characterized by containing an ultraviolet absorbing agent represented by the following formula (I): (in the formula, Rto Reach independently represent a monovalent group such as a hydrogen atom, Rrepresents a monovalent sulfur-containing group represented by the following formula (i): (in the formula, Rrepresents a divalent hydrocarbon group with 1 to 20 carbon atoms or the like; Rrepresents a divalent hydrocarbon group with 1 to 20 carbon atoms or the like; Rrepresents a monovalent hydrocarbon group with 1 to 20 carbon atoms; the total number of carbon atoms in R, n number of R, and Ris 30 or less; m represents an integer of 0 or 1; and n represents an integer of 0 to 3)), and a resin material.

Plastic lens

Provided is an additive for imparting ultraviolet absorbency, or an additive for imparting a high refractive index, which has satisfactory compatibility with a resin serving as a matrix and can maintain high transparency even if added in high concentrations. Also provided is an additive with which the function of imparting both ultraviolet absorbency and a high refractive index can be realized by means of one kind of additive. This additive is represented by the following Formula (I): 

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Aichi, Japan

Yuichi Shishino