Abstract: Provided is a composition for a sound insulating sheet member, a sound insulating sheet member, and a sound insulating structure body with excellent sound insulating performance. A sound insulating structure body including: a plurality of convex-shaped rubber-elastic resonant portions; and a sheet-like support that supports the resonant portions, wherein the resonant portions have a storage modulus G? obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 100 MPa or less at 25° C. and 10 kHz, and the areal density of the support is 1.0 kg/m2 or less.

Abstract: A structural body including a plurality of convex-shaped rubber-elastic resonant portions, and a sheet-like support that supports the resonant portions. A specific gravity of the resonant portions is 1.0 g/cm3 or more and 3.0 g/cm3 or less, a height of the resonant portions is from 50 ?m to 100 mm, and an areal density of the support is 1.0 kg/m2 or less.

Abstract: Provided is a composition for a sound insulating sheet member, a sound insulating sheet member, and a sound insulating structure body with excellent sound insulating performance. A sound insulating structure body including: a plurality of convex-shaped rubber-elastic resonant portions; and a sheet-like support that supports the resonant portions, wherein the resonant portions have a storage modulus G? obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 100 MPa or less at 25° C. and 10 kHz, and the areal density of the support is 1.0 kg/m2 or less.

Abstract: An optical film production method for suppressing air bubbles in microlenses, comprising rotating a roll die having a plurality of concave-shaped microlens transfer portions on the surface and running a substrate in the rotation direction; supplying an active energy ray-curable composition ? onto a coating roll adjacent to the roll die surface, flattening the composition ?, coating the flattened composition ? on the roll die surface; supplying an active energy ray-curable composition ? on the substrate and coating the composition ? on a surface of the substrate; associating the compositions ? and ? between the roll die and the substrate to form a liquid pool; and irradiating a region between the roll die surface and the substrate surface with an active energy ray so the compositions ? and ? are sandwiched between the roll die surface and the substrate surface to cure the compositions ? and ?.

Abstract: An optical film has a plurality of aligned convex microlenses, each of which has a region ? and a region ?, region ? forming the outer part of the convex shape of the microlens and positioned so as to cover region ?. Both region ? and region ? contain a resin, and the refractive index of the resin in region ? is higher than the refractive index of the resin in region ?; region ? contains fine particles, and region ? contains fine particles, and the content of the fine particles contained in region ? is lower than the content of the fine particles contained in region ?; or region ? contains fine particles, and region ? contains fine particles, and the content of the fine particles contained in region ? is higher than the content of the fine particles contained in region ?.

Abstract: This optical film includes a substrate and a plurality of convex microlenses arrayed on the substrate. The microlenses have an ?-region and a ?-region. The ?-region occupies the outer portion of the convex shape of the microlenses, and is positioned in a manner so as to cover the ?-region. In an adhesion test conforming to ISO 2409 for measuring the adhesiveness of the substrate and the optical film, the test result is class 0 or class 1.

Abstract: An optical film production method for suppressing air bubbles in microlenses, comprising rotating a roll die having a plurality of concave-shaped microlens transfer portions on the surface and running a substrate in the rotation direction; supplying an active energy ray-curable composition ? onto a coating roll adjacent to the roll die surface, flattening the composition ?, coating the flattened composition ? on the roll die surface; supplying an active energy ray-curable composition ? on the substrate and coating the composition ? on a surface of the substrate; associating the compositions ? and ? between the roll die and the substrate to form a liquid pool; and irradiating a region between the roll die surface and the substrate surface with an active energy ray so the compositions ? and ? are sandwiched between the roll die surface and the substrate surface to cure the compositions ? and ?.

Abstract: This optical film comprises: a recessed and projected structure layer that forms one surface of the optical film; and an adhesive layer that forms the other surface of the optical film. The recessed and projected structure layer contains 1-28% by mass of first fine light diffusing particles relative to the total mass of the recessed and projected structure layer, and the adhesive layer contains 1-40% by mass of second fine light diffusing particles relative to the total mass of the adhesive layer. This surface light emitting body comprises the above-described optical film.

Abstract: An optical film has a plurality of aligned convex microlenses, each of which has a region ? and a region ?, region ? forming the outer part of the convex shape of the microlens and positioned so as to cover region ?. Both region ? and region ? contain a resin, and the refractive index of the resin in region ? is higher than the refractive index of the resin in region ?; region ? contains fine particles, and region ? contains fine particles, and the content of the fine particles contained in region ? is lower than the content of the fine particles contained in region ?; or region ? contains fine particles, and region ? contains fine particles, and the content of the fine particles contained in region ? is higher than the content of the fine particles contained in region ?.