Lg Chem, Ltd

Jung-Min Ko

Sang-Choll Han

Yune-Hyoun Kim

Dong-Kwon Lee

Sang-Kook Kim

Seung-Tae Oh

Byung-Su Park

Sang-Hyeok Im

In-Ki Hong

The present invention provides the composition of an alkali-free glass composition containing no alkali metal oxide and the preparation thereof. The alkali-free glass comprising substantially no alkali metal oxide according to the present invention comprises 60 to 70 wt % of SiO; 1 to 3.5 wt % of BO; 1 to 13 wt % of AlO; 8.5 to 14 wt % of MgO; 1 to 3 wt % of CaO; 4 to 7 wt % of SrO; and 0.5 to 7 wt % of BaO, based on the total weight of oxides present therein.

Alkali-free glass and preparation thereof

There is provided a process of making a mold for optical films. The process of making a mold for optical films comprises: etching a stereostructure in a surface of the mold having a flat surface or an engraved convex and concave surface, by using a laser beam. The process of making a mold for optical films may be useful to easily mark spots, to control the height of protrusions and the position where the protrusions are formed, and also to form the protrusions having constant depths even in a curved surface such as a convex and concave surface.

Process of making mold for optical film

Growing community of inventors

Daejeon, South Korea

Jung-Min Ko