Method for producing optical member, and optical member
The method for producing an optical member of the present invention includes: Process (1) of applying a first resin to a substrate; Process (2) of applying a second resin to at least one of the first resin and a die; Process (3) of pushing the substrate to the die with the first resin and the second resin in between to form a resin layer including on a surface thereof an uneven structure; and Process (4) of curing the resin layer to provide a polymer layer. The die includes a surface after release treatment with a fluorine release agent. The first resin contains a resin component, and the resin component contains predetermined amounts of a (meth)acrylamide compound and a urethane prepolymer containing six or more functional groups. The second resin contains predetermined amounts of a reactive group-containing monomer, a fluorosurfactant, and a fluorine-containing monomer.
1. A method for producing an optical member including a polymer layer that includes on a surface thereof an uneven structure provided with multiple projections at a pitch not longer than a wavelength of visible light, the method comprising:
Process (1) of applying a first resin to a substrate;
Process (2) of applying a second resin to at least one of the first resin and a die;
Process (3) of pushing the substrate to the die with the first resin and the second resin in between to form a resin layer including on a surface thereof the uneven structure; and
Process (4) of curing the resin layer to provide the polymer layer,
the die including a surface after release treatment with a fluorine release agent,
the first resin containing a resin component,
the resin component containing 10 wt % or more and 30 wt % or less of a (meth)acrylamide compound and 20 wt % or more and 45 wt % or less of a urethane prepolymer containing six or more functional groups, with the whole quantity of the resin component taken as 100 wt %,
the second resin containing 10 wt % or more and 50 wt % or less of a reactive group-containing monomer, 10 wt % or more and 70 wt % or less of a fluorosurfactant, and more than 0 wt % and 20 wt % or less of a fluorine-containing monomer, with the whole quantity of the second resin taken as 100 wt %, and
the reactive group-containing monomer including at least one of an amide group, a hydroxy group, and an acetoacetoxy group as a reactive group.
2. The method for producing an optical member according to claim 1 ,
wherein the first resin has a viscosity of 70 mPa·s or higher and 10000 mPa·s or lower at 25° C.
3. The method for producing an optical member according to claim 1 ,
wherein the first resin has a solubility parameter of 10 (cal/cm 3 ) 1/2 or higher and 12 (cal/cm 3 ) 1/2 or lower.
4. The method for producing an optical member according to claim 1 ,
wherein the first resin and the second resin satisfy a difference in solubility parameter of 0 (cal/cm 3 ) 1/2 or greater and 3 (cal/cm 3 ) 1/2 or smaller.
5. The method for producing an optical member according to claim 1 ,
wherein the first resin further contains 0.1 parts by weight or more and 10 parts by weight or less of a polymerization initiator with the whole quantity of the resin component taken as 100 parts by weight.
6. The method for producing an optical member according to claim 1 ,
wherein the (meth)acrylamide compound contains N,N-dimethyl (meth)acrylamide.
7. The method for producing an optical member according to claim 1 ,
wherein the urethane prepolymer containing six or more functional groups contains hexamethylene diisocyanate as a constituent.
8. The method for producing an optical member according to claim 1 ,
wherein the fluorosurfactant and the fluorine-containing monomer each contain at least one of a —OCF 2 — chain and a ═NCO— chain.