Adhesive film and display member using same
AssigneeSamsung SDI Co., Ltd.
InventorsIrina Nam, Young Jong Kim, Hwan Sung Cheon, In Cheon Han
Life of this patent
Estimating the term…
Abstract
An adhesive film of the present invention comprises a (meth)acrylate-based copolymer and a cross-linking agent, and a gel fraction thereof is approximately 50-95%, and a ratio of change G′ in storage modulus thereof, represented by the following formula 1, is 20% or less. G′=(G7−G1)/G1×100 [Formula 1] (In formula 1, G1 is a storage modulus at 25° C. when the adhesive film is matured at 23° C. and a relative humidity (RH) of 55% for one day, and G7 represents a storage modulus at 25° C. when the adhesive film is matured at 23° C. and an RH of 55% for seven days.)
Claims19
A pressure-sensitive adhesive film comprising a (meth)acrylate copolymer and a crosslinker and having a gel fraction of about 50% to about 95% and a storage modulus variation G′ of about 20% or less as represented by Equation 1:
- G′=(G7−G1)/G1×100 [Equation 1]
- where G1 is the storage modulus of the pressure-sensitive adhesive film at 25° C. after aging at 23° C. and 55% RH for 1 day and G7 is the storage modulus of the pressure-sensitive adhesive film at 25° C. after aging at 23° C. and 55% RH for 7 days.
A pressure-sensitive adhesive film comprising:
- a (meth)acrylate copolymer, the (meth)acrylate copolymer comprising a copolymer of a monomer mixture comprising an alkyl (meth)acrylate monomer, a monomer having a glass transition temperature (Tg) of about 50° C. or higher and an oxygen-containing heterocyclic ring containing monomer;
- and a crosslinker,
- wherein the pressure-sensitive adhesive film has a storage modulus variation G′ of about 20% or less as represented by Equation 1:
- G′=(G7−G1)/G1×100 [Equation 1]
- where G1 is the storage modulus of the pressure-sensitive adhesive film at 25° C. after aging at 23° C. and 55% RH for 1 day and G7 is the storage modulus of the pressure-sensitive adhesive film at 25° C. after aging at 23° C. and 55% RH for 7 days.
A pressure-sensitive adhesive film comprising:
- a (meth)acrylate copolymer, the (meth)acrylate copolymer comprising a copolymer of a monomer mixture comprising an alkyl (meth)acrylate monomer, a monomer having a glass transition temperature (Tg) of about 50° C. or higher and an oxygen-containing heterocyclic ring containing monomer;
- and a crosslinker,
- wherein the pressure-sensitive adhesive film has a gel fraction difference of about 10% or less as calculated by Equation 2:
- Gel fraction difference=GF7−GF1 [Equation 2]
- where GF7 is the gel fraction after aging for 7 days as calculated by Equation 3 and GF1 is the gel fraction after aging for 1 day as calculated by Equation 3:
- Gel fraction (%)=(WC−WA)/(WB−WA)×100 [Equation 3]
- where WA is the weight of a wire mesh;
- WB is the total weight of 0.5 g of a specimen covered with the wire mesh, in which the specimen is obtained by aging the pressure-sensitive adhesive film at 23° C. and 55% RH for 1 day or 7 days;
- and WC is the total weight of the pressure-sensitive adhesive film and the wire mesh obtained by placing the specimen, which is obtained by aging the pressure-sensitive adhesive film and covered with the wire mesh, in a sample bottle and adding 50 cc of ethyl acetate to the sample bottle, followed by storage at 25° C. for 1 day and drying at 100° C. for 12 hours.
Dependencies are inferred from the claim text.