Photonic crystal structure and anti-forgery color conversion film comprising same
AssigneeKorea Research Institute of Chemical Technology
InventorsSeo Hyun Jung, Jong Mok Park, Ho Youl Kong, Ja Young Bae
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Abstract
An anti-forgery color conversion film includes a photonic crystal structure whose color is converted by an external stimulus such as a breath. The photonic crystal structure includes a first refractive index layer including a first polymer exhibiting a first refractive index; and a second refractive index layer which is alternately laminated with the first refractive index layer and includes a second polymer exhibiting a second refractive index. A consumer who purchases an article including the color conversion film may easily distinguish the authenticity of the article.
Claims20
An anti-forgery color conversion film comprising:
- a photonic crystal structure whose color is converted by an external stimulus,
- wherein the photonic crystal structure comprises:
- a first refractive index layer including a first polymer exhibiting a first refractive index;
- and
- a second refractive index layer which is alternately laminated with the first refractive index layer and includes a second polymer exhibiting a second refractive index,
- wherein the first refractive index and the second refractive index are different from each other, and
- one of the first polymer and the second polymer is a copolymer including a repeating unit represented by Formula 1 below:
- wherein R1 and R2 are each independently hydrogen or C1-3 alkyl;
- R3 is represented by Formula 2 or 3 below;
- R4 is O or NH;
- R5 is benzoylphenyl, wherein the benzoylphenyl is unsubstituted, or substituted with one to four substituents each independently selected from the group consisting of hydroxy, halogen, nitro, C1-5 alkyl and C1-5 alkoxy;
- n and m are each independently an integer of 1 or more, and
- n+m is 100 to 2,000;
- wherein R6 is O or NH;
- R7 is H, C1-10 alkyl, C1-10 aminoalkyl, fluoroalkyl or
- and
- o is an integer of 1 to 10;
- wherein p is an integer of 1 to 4.
A photonic crystal structure whose color is converted by an external stimulus, comprising:
- a first refractive index layer including a first polymer exhibiting a first refractive index;
- and a second refractive index layer which is alternately laminated with the first refractive index layer and includes a second polymer exhibiting a second refractive index,
- wherein the first refractive index and the second refractive index are different from each other;
- and
- one of the first polymer and the second polymer is a copolymer including a repeating unit represented by Formula 1 below:
- wherein R1 and R2 are each independently hydrogen or C1-3 alkyl;
- R3 is represented by Formula 2 or 3 below;
- R4 is O or NH;
- R5 is benzoylphenyl, wherein the benzoylphenyl is unsubstituted, or substituted with one to four substituents each independently selected from the group consisting of hydroxy, halogen, nitro, C1-5 alkyl and C1-5 alkoxy;
- n and m are each independently an integer of 1 or more;
- and
- n+m is 100 to 2,000;
- wherein R6 is O or NH;
- R7 is H, C1-10 alkyl, C1-10 aminoalkyl, C1-10 fluoroalkyl or
- and
- o is an integer of 1 to 10;
- wherein p is an integer of 1 to 4.
Dependencies are inferred from the claim text.