3m Innovative Properties Company

Tetsuya Toma

Toshihiro Suwa

Patrick H Marushin

Todd M Johnson

Masaru Shinohara

Yutaka Yasui

A light directing film and an optical system incorporating same are disclosed. The light directing film includes a first major surface and a microstructured second major surface. The microstructured second major surface has at least two periodic microstructured patterns. The first periodic pattern is arranged along a first direction. The second periodic pattern is arranged along a second direction different from the first direction.

Light directing film

The present invention provides a release material formed by irradiating a release material precursor having a shear storage modulus of about 1&times;10 to about 3&times;10 Pa at 20&deg; C. and a frequency of 1 Hz, wherein the release material has a contact angle of 15&deg; or more, measured using a mixed solution of methanol and water (volume ratio: 90/10) having a wet tension of 25.4 mN/m. The release material of the present invention has improved anchoring to certain substrates, ensuring relatively low release strength from certain pressure-sensitive adhesives, particularly even after the exposure to a high temperature. Thus, the release materials are capable of allowing the pressure-sensitive adhesive to maintain stable residual adhesion strength.

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Woodbury, MN, United States of America

Tetsuya Toma