Lintec Corporation

Shuuichiro Ikeda

Kenji Suzuki

Shunpei Watanabe

A pressure-sensitive adhesive sheet 1A is for use by sticking onto a liquid crystal cell, and it has a construction wherein the pressure-sensitive adhesive layer 3 is joined to one side of the base material layer 2 which is constructed with a light-polarizing sheet and a release sheet 4 stuck onto the other side from the base material layer 2 of the pressure-sensitive adhesive layer 3. The pressure-sensitive adhesive layer 3 is constructed as a laminate with the layers 31 and 32. An acrylic-based pressure-sensitive adhesive, for example, can be used for the pressure-sensitive adhesives from which the layers 31 and 32 are constructed, but the shear elastic modulus or the relaxation elastic modulus of the layer 32 is set lower than that of the layer 31 as a result of a difference in the composition of the pressure-sensitive adhesive, the degree of crosslinking or the amount of plasticizer added in the layers 1 and 32. The stress which is produced by contraction, for example, of the base material layer is relieved and stress concentration can be reduced. In particular, white marking and color unevenness of the liquid crystal cell can be suppressed.

Pressure-sensitive adhesive sheet

A pressure-sensitive adhesive sheet 1A is for use by sticking onto a liquid crystal cell, and it has a construction wherein the pressure-sensitive adhesive layer 3 is joined to one side of the base material layer 2 which is constructed with a light-polarizing sheet and a release sheet 4 stuck onto the other side from the base material layer 2 of the pressure-sensitive adhesive layer 3. As a main polymer for constituting the pressure-sensitive adhesive layer 3, an acrylic-based polymer is for example used, of which weight-average molecular weight is 600,000 to 2,000,000. Further, a plasticizer is added to the pressure-sensitive adhesive layer 3. According to the pressure-sensitive adhesive sheet, the stress which is produced by contraction, for example, of the base material layer is relieved and stress concentration can be reduced. In particular, white marking and color unevenness of the liquid crystal cell can be suppressed.

Growing community of inventors

Saitama-ken, Japan

Shuuichiro Ikeda