Near infrared ray-absorbable dye composition, and near infrared ray-absorbable filter and adhesive agent both comprising the composition

[0183]As a near infrared light absorbable dye composition, 15 mg of a compound represented by the following formula (1-a), 30 mg of a compound represented by the following formula (2-a) and 30 mg of a compound represented by the following formula (3-a) were added to 2.5 g of toluene, and stirred to obtain a solution in which the near infrared light absorbable dye compositions was dissolved. Then, before an exchange reaction of “—S” for Ni took place, 10 g of SK-Dyne 1811L (supplied from Soken Chemical & Engineering Co., Ltd.) which was an acrylic pressure sensitive adhesive and 25 mg of isocyanate-based curing agent L-45 (supplied from Soken Chemical & Engineering Co., Ltd.) were added to this solution and stirred to obtain a near infrared light absorbable dye-containing pressure sensitive adhesive. Air bubbles convolved upon stirring were removed by applying ultrasonic waves or resting to accumulate the bubbles in an upper part. SK-Dyne 1811L (supplied from Soken Chemical & Engineerin

[0187]A near infrared light absorbable dye-containing pressure sensitive adhesive was prepared in the same way as in Example 1, except that 34 mg of the above compound (1-a), 12 mg of the above compound (2-a) and 29 mg of the above compound (3-a) were used as the near infrared light absorbable dye compositions, and the near infrared light absorbable filter was obtained in the same way as in Example 1. The content ratio of the compound (1-a), the compound (2-a) and the compound (3-a) in this near infrared light absorbable filter is the same as in the above use ratio because no exchange reaction did not take place.

[0188]This near infrared light absorbable filter has the transmittance of 20% or less at 825 nm, 880 nm and 980 nm, and thus effectively shields the light emitted from the PDP main body. The adhesion strength measured in the same way as in Example 1 was 850 g / 25 mm width.

[0189]A near infrared light absorbable dye-containing pressure sensitive adhesive was prepared in the same way as in Example 1, except that 5 mg of the above compound (1-a), 52 mg of the above compound (2-a) and 18 mg of the above compound (3-a) were used as the near infrared light absorbable dye compositions, and the near infrared light absorbable filter was obtained in the same way as in Example 1. The content ratio of the compound (1-a), the compound (2-a) and the compound (3-a) in this near infrared light absorbable filter is the same as in the above use ratio because no exchange reaction did not take place.

[0190]This near infrared light absorbable filter has the transmittance of 20% or less at 825 nm, 880 nm and 980 nm, and thus effectively shields the light emitted from the PDP main body.