A curable composition comprises at least one monomer comprising at least one (meth)acryl group and a photoinitiator system. The photoinitiator system comprises at least one Type II photoinitiator and at least one cyclic β-diketone represented by the formula (I) or a tautomer thereof. R.sup.1 represents an organic moiety having at least one free-radically polymerizable group. Each R.sup.2 independently represents H or an aliphatic group having from 1 to 12 carbon atoms, and up to two of oxygen and sulfur atoms, n represents 1, 2, or 3.

A curable composition comprises at least one monomer comprising at least one (meth)acryl group and a photoinitiator system. The photoinitiator system comprises at least one Type II photoinitiator and at least one cyclic β-diketone represented by the formula (I) or a tautomer thereof. R.sup.1 represents an organic moiety having at least one free-radically polymerizable group. Each R.sup.2 independently represents H or an aliphatic group having from 1 to 12 carbon atoms, and up to two of oxygen and sulfur atoms, n represents 1, 2, or 3.

An active energy ray-curable lithographic printing ink including a rosin-modified resin (A), an active energy ray-curable compound (B), a photopolymerization initiator (C), and an extender pigment (D), where the active energy ray-curable compound (B) includes dipentaerythritol hexaacrylate (B1), and an amount of the dipentaerythritol hexaacrylate (B1) relative to a total mass of the active energy ray-curable lithographic printing ink is within a range from 20 to 37% by mass. The photopolymerization initiator (C) includes at least two types of compounds selected from acylphosphine oxide-based compounds (C1), thioxanthone-based compounds (C2), and oxime ester-based compounds (C3), an amount of the extender pigment (D) relative to a total mass of the active energy ray-curable lithographic printing ink is within a range from 0.1 to 10% by mass, and a viscosity of the ink at 25° C. is within a range from 10 to 120 Pa.Math.s.

An active energy ray-curable lithographic printing ink including a rosin-modified resin (A), an active energy ray-curable compound (B), a photopolymerization initiator (C), and an extender pigment (D), where the active energy ray-curable compound (B) includes dipentaerythritol hexaacrylate (B1), and an amount of the dipentaerythritol hexaacrylate (B1) relative to a total mass of the active energy ray-curable lithographic printing ink is within a range from 20 to 37% by mass. The photopolymerization initiator (C) includes at least two types of compounds selected from acylphosphine oxide-based compounds (C1), thioxanthone-based compounds (C2), and oxime ester-based compounds (C3), an amount of the extender pigment (D) relative to a total mass of the active energy ray-curable lithographic printing ink is within a range from 0.1 to 10% by mass, and a viscosity of the ink at 25° C. is within a range from 10 to 120 Pa.Math.s.

Disclosed is an actinic radiation curable (meth)acrylic composition for use in hardcoats for optical displays containing one or more multifunctional (meth)acrylate monomers, one or more Si-containing (meth)acrylate monomers, one or more UV radical initiators, one or more monomers to improve surface cure, nanoparticles, and one or more organic solvents. Coated hardcoat articles made from this composition exhibit improved properties for use in display applications.

Disclosed is an actinic radiation curable (meth)acrylic composition for use in hardcoats for optical displays containing one or more multifunctional (meth)acrylate monomers, one or more Si-containing (meth)acrylate monomers, one or more UV radical initiators, one or more monomers to improve surface cure, nanoparticles, and one or more organic solvents. Coated hardcoat articles made from this composition exhibit improved properties for use in display applications.

A photopolymerizable composition comprises at least a polymerizable resin, a photosensitizer, an annihilator, and a photoinitiator. The photosensitizer is formulated to absorb an excitation light signal received in a first range of wavelengths. The annihilator is formulated to emit a light signal in a second range of wavelengths different from the first. During the absorption of light by the photosensitizer in the first range of wavelengths, the annihilator emits a light signal in the second range, a photon energy of the emitted light signal being greater than a photon energy of the light signal received by the photosensitizer. The annihilator is also formulated to implement an energy transfer mechanism to excite the photoinitiator for polymerization of the resin. The excited photoinitiator is formulated to generate at least one polymerizable initiator to cause the polymerization reaction. Related methods, such as three-dimensional printing methods, and materials are also disclosed.

A hard coating film according to an embodiment includes a substrate layer, a first hard coating layer formed on the substrate layer and satisfying a predetermined elastic recovery rate, and a second hard coating layer formed on the first hard coating layer and satisfying a predetermined water contact angle. The hard coating film according to embodiments may provide improved press resistance, scratch resistance, and flexibility.

A hard coating film according to an embodiment includes a substrate layer, a first hard coating layer formed on the substrate layer and satisfying a predetermined elastic recovery rate, and a second hard coating layer formed on the first hard coating layer and satisfying a predetermined water contact angle. The hard coating film according to embodiments may provide improved press resistance, scratch resistance, and flexibility.

A contact lens product includes a contact lens and a buffer solution. The contact lens is stored in the buffer solution. The buffer solution includes at least one antioxidant. The contact lens includes at least one curcuminoid. When a weight percentage concentration of the curcuminoid in the contact lens is Ccu, and a weight percentage concentration of the antioxidant in the buffer solution is Cao, a specific condition relating to Ccu/Cao is satisfied.