Semi-hardened pressure-sensitive adhesive film
AssigneeLG Chem, Ltd.
InventorsMin-Seok Song, Chan-Oh Yoon, Eun-Kyung Park, Bu-Gi Jung, Jang-Soon Kim
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Abstract
Disclosed is a semi-hardened pressure sensitive adhesive film to be used in the semi-hardened state and having excellent printing step absorption properties. The adhesive film according to the present invention contains a radial polymer composition and a cationic polymer composition, and the radial polymer composition is primarily cross-linked to maintain the semi-hardened state. When applied onto a substrate through a printing step, the present invention has excellent step absorption properties and adhesion properties and excellent durability even under high-temperature and high-humidity conditions.
Claims7
A method of preparing an adhesive film comprising:
- (a) preparing an adhesive composition comprising a radical polymerizable composition and a cation polymerizable composition;
- (b) forming a semi-cured adhesive film by performing a primary crosslinking of the radical polymerizable composition by UV irradiation at an irradiance from 1 mW/cm2 to 10 mW/cm2,
- (c) attaching the semi-cured adhesive film to a substrate having print steps, and
- (d) forming a complete-cured adhesive film by performing a secondary crosslinking of the cation polymerizable composition by UV irradiation at an irradiance from 50 mW/cm2 to 150 mW/cm2,
- wherein the ratio of the radical polymerizable composition to the cation polymerizable composition is 1:1.
Dependencies are inferred from the claim text.