Release film and method for manufacturing the same
The present invention relates to a release film comprising a base film containing a synthetic resin; an embossing patterns layer that is formed on the base film and has more than one protrusion containing a curing material of a photo curable resin composition, and a method for producing the same, in which the present invention can provide a release film having an excellent workability and an exclusive and beautiful appearance, since the surface roughness of the release film is low.
1. A release film, comprising:
a base film containing a synthetic resin including more than one selected from the group consisting of polyethyleneterephthalate, polyethylene, polypropylene, polyacrylate, polyurethane and polyester-based resin;
an embossing patterns layer that is formed on the base film and has more than one protrusion containing a curing material of a photo curable resin composition including a photo curable oligomer, a thinner and a photopolymerization initiator;
a silicon release-treating layer that is formed on the embossing patterns layer;
a first primer layer that is formed between the base film and the embossing patterns layer; and
a second primer layer that is formed on the base film opposite to the embossing patterns layer,
wherein a surface roughness (Rt) of the base film is less than 3 μm,
wherein the maximum height of the protrusion is 1 to 20 μm and the width of the base side is 100 to 500 μm,
wherein the first primer layer includes more than one selected from the group consisting of polyacrylate resin, polyester resin, polyolefin resin and polyurethane resin and the second primer layer includes more than one selected from the group consisting of polyethylene resin, polypropylene resin, acrylate resin, polyurethane resin, silicon resin and polyester resin, and
wherein the photo curable oligomer includes more than one selected from the group consisting of polyester acrylate, epoxy acrylate, urethane acrylate and silicon acrylate.
2. A method for producing the release film of claim 1 , comprising:
a first step for forming embossing patterns using a photo curable resin on a base film containing a synthetic resin by any one of coating methods selected from the group consisting of a direct gravure coating, a reverse gravure coating, a gravure offset coating, a micro-gravure coating, a silk screen coating, a rotary screen coating, a knife coating, a bar coating and a direct roll coating; and
a second step for curing the embossing patterns that are formed in the first step by irradiating ultraviolet having 300 to 450 nm wavelengths on the embossing patterns for 0.1 seconds to 120 seconds,
wherein a surface roughness (Rt) of the base film is less than 3 μm, and
wherein the maximum height of the protrusion is 1 to 20 μm and the width of the base side is 100 to 500 μm.