Coating composition
The present invention relates to a coating composition. More particularly, the present invention relates to a composition capable of forming a plastic film which exhibits high hardness and excellent processability. According to the coating composition of the present invention, a plastic film with the rare occurrence of curling and high hardness can be provided.
1. A coating composition, comprising a tri- to hexafunctional acrylate-based monomer, a thermosetting prepolymer composition, a photoinitiator, an inorganic fine particle and an organic solvent, wherein the tri- to hexafunctional acrylate-based monomer and the thermosetting prepolymer composition are used at a weight ratio of 1:0.1 to 1:1.2, as measured on the basis of solid components thereof.
2. The coating composition of claim 1 , wherein the thermosetting prepolymer composition includes a polyester-based polyurethane oligomer, polyol and polyisocyanate.
3. The coating composition of claim 2 , comprising 10 to 40% by weight of the polyester-based polyurethane oligomer, 5 to 30% by weight of the polyol, and 50 to 80% by weight of the polyisocyanate, based on the total weight of the solid components of the thermosetting prepolymer composition.
4. The coating composition of claim 2 , wherein the polyester-based polyurethane oligomer has a number average molecular weight of 1,000 to 100,000 g/mol.
5. The coating composition of claim 2 , wherein the polyol includes one or more selected from the group consisting of polyethylene glycol polyol, polycarprolactone polyol, polyester polyol, polyether polyol, polyacryl polyol, and polycarbonate polyoldiol.
6. The coating composition of claim 2 , wherein the polyisocyanate is one or more selected from the group consisting of 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, 1,4-cyclohexyl diisocyanate, isophorone diisocyanate, α,α-xylylene diisocyanate, 4,4′-dimethylmethane diisocyante, 1,3-phenylene diisocyanate and toluene diisocyanate, or polyisocyanate polymerized from dimers or trimers thereof.
7. The coating composition of claim 1 , wherein the thermosetting prepolymer composition further includes one or more catalysts selected from the consisting of dibutyltindilaurate (DBTDL), zinc octoate, iron acetyl acetonate, N,N-dimethyl ethanolamine, and triethylene diamine.
8. The coating composition of claim 1 , wherein the tri to hexafunctional acrylate monomer includes one or more selected from the group consisting of trimethylolpropane triacrylate (TMPTA), trimethylolpropane ethoxy triacrylate (TMPEOTA), glycerin-propoxylated triacrylate (GPTA), pentaerythritol tetraacrylate (PETA), and dipentaerythritol hexaacrylate (DPHA).
9. The coating composition of claim 1 , wherein the inorganic fine particle has a diameter of 100 nm or less.
10. The coating composition of claim 1 , wherein the inorganic fine particle includes one or more selected from the group consisting of a silica nanoparticle, an aluminum oxide fine particle, a titanium oxide fine particle, and a zinc oxide fine particle.
11. The coating composition of claim 1 , comprising 40 to 80 parts by weight of the tri- to hexafunctional acrylate-based monomer, 5 to 50 parts by weight of the thermosetting prepolymer composition, 0.2 to 5 parts by weight of the photoinitiator, and 5 to 40 parts by weight of the inorganic fine particle, based on 100 parts by weight of the solid components including the tri- to hexafunctional acrylate-based monomer, the thermosetting prepolymer composition, the photoinitiator, and the inorganic fine particle.