Nitto-denko Corporation

Kenjiro Niimi

Tatsumi Amano

Hiromoto Haruta

Yuka Sekiguchi

Masato Yamagata

Kazuma Mitsui

Natsuko Watanabe

A pressure-sensitive adhesive layer contains a base polymer and has properties of (1) and (2) below: in a case where a pressure-sensitive adhesive sheet A is laminated to an adherend X surface, they are left to stand at a temperature of 23&#xb0; C. and a humidity of 30% for 12 hours, and the pressure-sensitive adhesive sheet A is then separated, (1) a water contact angle A on the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is 70&#xb0; or less, and (2) a pressure-sensitive adhesive strength of a pressure-sensitive adhesive tape B with respect to the adherend X surface from which the pressure-sensitive adhesive sheet A has been separated is higher than that of the pressure-sensitive adhesive tape B with respect to the adherend X surface not subjected to any treatment.

Pressure-sensitive adhesive layer and pressure-sensitive adhesive sheet

A surface protective film that exhibits superior adhesiveness to an adherend and exhibits only small differences in peel strength according to the surface state of an adherend is provided. The surface protective filmis provided with an acrylic pressure-sensitive adhesive (PSA) layeron one side of a support, and satisfies the following conditions: a thickness reduction ratio (indentation strain E) when a compressive stress of 0.195 MPa is applied for 10 minutes to a laminateobtained by laminating 24 of the protective filmsis 7.0% or more, and a ratio (E/E) of Eto a thickness reduction ratio (permanent strain) Ethat remains 10 minutes after the stress is released is 30 or less; and a peel strength Son a plain TAC polarizing plate is two times or less a peel strength Son a TAG polarizing plate that has been subjected to AG treatment.

Surface protective film

Growing community of inventors

Osaka, Japan

Kenjiro Niimi