Nitto-denko Corporation

Mika Okada

Kenichi Okada

Junichi Nagase

Kunio Nagasaki

Tomonari Naito

Kiichiro Matsushita

Taiki Shimokuri

Kazumichi Kato

Kohei Doi

Yousuke Makihata

Hideyuki Tokuyama

Chie Matsumoto

Tetsuya Otsuka

Natsuki Ukei

Tadao Takahashi

Namiko Murayama

Tsunaki Kitahara

Kuniaki Inui

Toshitaka Takahasi

Chie Kitano

Izumi Nishimura

A foamed sheet according to the present invention has a thickness of 30 to 500 &#x3bc;m and includes a foam. The foam has a density of 0.2 to 0.7 g/cm, an average cell diameter of 10 to 150 &#x3bc;m, and a peak top of loss tangent (tan &#x3b4;) occurring in a temperature range of from &#x2212;30&#xb0; C. to 30&#xb0; C., where the loss tangent is defined as the ratio of a loss modulus to a storage modulus determined at an angular frequency of 1 rad/s in dynamic viscoelastic measurement of the foam. The foam preferably has a maximum of the loss tangent (tan &#x3b4;) in the temperature range of from &#x2212;30&#xb0; C. to 30&#xb0; C. of 0.2 or more.

Foamed sheet

A laminated optical film according to an embodiment of the present invention includes a polarizing plate and a retardation layer formed of a water dispersible pressure-sensitive adhesive composition containing an inorganic laminar compound.

Laminated optical film

Provided is a water-dispersed pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive that exhibits good adhesiveness to a non-polar adherend and maintains its properties at a low temperature. The water-dispersed pressure-sensitive adhesive composition according to the present invention comprises a (meth)acrylic polymer obtained by polymerizing a monomer composition containing as a primary component an alkyl (meth)acrylate having an alkyl group with 1 to 18 carbon atoms, a latex containing a rubber component that is immiscible with the (meth)acrylic polymer and has a loss tangent peak temperature of &#x2212;5&#xb0; C. or below when determined by a dynamic viscoelastic measurement in which shear strain is applied at a frequency of 1 Hz, and a tackifier that is miscible with the rubber component, but immiscible with the (meth)acrylic polymer.

Water-dispersed pressure-sensitive adhesive composition, pressure-sensitive adhesive and pressure-sensitive adhesive sheet

The aqueous dispersion adhesive composition contains an aqueous dispersion copolymer obtained by reacting of a reaction component containing alkyl (meth)acrylate whose linear or branched alkyl group has 4 to 18 carbon atoms, (meth)acrylic acid, a phosphoric acid group-containing vinyl monomer and an alkoxysilyl group-containing vinyl monomer to react; and a crosslinking agent having reactivity with a carboxyl group. In the aqueous dispersion adhesive composition, an amount of the crosslinking agent is from 0.07 to 4 parts by weight per 100 parts by weight of the aqueous dispersion copolymer, and in an adhesive layer made of the aqueous dispersion adhesive composition, an elongation at 90&#xb0; C. is 200% or less.

Aqueous dispersion adhesive composition and adhesive film

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Ibaraki, Japan

Mika Okada