Patent ID: 9458360
Filing Date: 2016-10-04
CPC Classification: C08K,C08L,C09J,Y10T

Claim Text:
1. An adhesive film used for advertisement comprising: a base film including a soft white PVC film having printability; and an adhesive layer formed on one or opposite sides of the base film and comprising a cured material of a water-based adhesive composition comprising a waterborne adhesive resin and having a concentration of ionic components of 100 ppm or less, wherein the waterborne adhesive resin is prepared by emulsion polymerization, and the emulsion polymerization is conducted in the presence of 0.01 to 1 wt % of an oxidation-reduction catalyst in the total components in a reactor involved in the emulsion polymerization, wherein the waterborne adhesive resin has a particle diameter of 100 to 500 nm, a weight average molecular weight of 50,000 to 700,000 and comprises a polymer of a monomer mixture including 90 to 99.9 parts by weight of a (meth)acrylic acid ester monomer having a C2 to C8 alkyl groups and 0.1 to 10 parts by weight of a crosslinking monomer, wherein the crosslinking monomer comprises at least one selected from the group consisting of a hydroxyl group containing monomer, a carboxyl group containing monomer, a nitrogen containing monomer, and a glycidyl group containing monomer, wherein the adhesive film has a reduction in peel strength of 6% or less after being aged at 70° C. for 72 hours based on the adhesive layer having an initial peel strength between 1719 and 1751 gf/25 mm, wherein the reduction in peel strength occurs between the adhesive film and a surface to which the adhesive film is attached, wherein the waterborne adhesive resin has a glass transition temperature of −60 to −10° C., wherein the water-based adhesive composition further comprises 0.1 to 5 parts by weight of a wetting agent based on 100 parts by weight of the waterborne adhesive resin, wherein the wetting agent is represented by Formula 1:  where R1 to R4 each independently represent a straight chain or branched chain alkyl group, and wherein R1 to R4 each independently represent a C1 to C8 alkyl group.