An interlayer structure having a cellulose ester layer for use in structural laminates is described herein. The cellulose ester layer provides rigidity and support to multilayer interlayers comprising an array of different layers. Due to the diverse properties of the cellulose ester layers, the present interlayers can be useful in producing structural laminates having high stiffness and which possess good optical clarity for a variety of applications, including outdoor structural applications.

An interlayer structure having a cellulose ester layer for use in structural laminates is described herein. The cellulose ester layer provides rigidity and support to multilayer interlayers comprising an array of different layers. Due to the diverse properties of the cellulose ester layers, the present interlayers can be useful in producing structural laminates having high stiffness and which possess good optical clarity for a variety of applications, including outdoor structural applications.

There is provided an interlayer film for laminated glass making a gap difficult to be generated at an end part of the sheet of laminated glass and enabling an increase in the YI value measured at the end part of the sheet of laminated glass to be suppressed. The interlayer film for laminated glass according to the present invention has a one-layer structure or a two or more-layer structure, and the interlayer film for laminated glass according to the present invention includes a polyvinyl acetal resin, a plasticizer, a hindered amine light stabilizer, an oxidation inhibitor having a sulfur atom, and an oxidation inhibitor having a phenol skeleton which is different from the oxidation inhibitor having a sulfur atom.

Provided is an interlayer film for laminated glass capable of effectively enhancing the sound insulating property at 6300 Hz while effectively preventing deterioration in sound insulating property at 3150 Hz in laminated glass. An interlayer film for laminated glass according to the present invention has a one-layer structure or a two or more-layer structure and includes a resin layer containing a resin and a plasticizer. The interlayer film has a resonance frequency X of 550 Hz or more and 740 Hz or less, a loss factor Y in a secondary mode of 0.35 or more, and satisfies a formula: Y>0.0008X−0.142 in a measurement of resonance frequency in a secondary mode in a damping test for laminated glass according to a central exciting method of laminated glass, when the laminated glass is obtained by arranging the interlayer film between two glass plates of 25 mm wide, 300 mm long and 2 mm thick.

The present invention relates to a polyvinyl acetal resin film, comprising a polyvinyl acetal resin material, wherein the polyvinyl acetal resin film has a thickness of 5 to 350 μm, and satisfies the following Formulae (1) and (2) where, comparing one surface and the other surface, a mean value of the 10-point average roughness of a rougher surface A and a mean value of the 10-point average roughness of a smoother surface B are defined as Rz1(a) μm and Rz2(a) μm, respectively:

Rz1(a)>1.1×Rz2(a)  (1)

3>Rz2(a)  (2), a value obtained by dividing the standard deviation of the 10-point average roughness of the surface A by Rz1(a) and a value obtained by dividing the standard deviation of the 10-point average roughness of the surface B by Rz2(a) are each 0 to 0.30, a viscosity of a toluene/ethanol (1:1, mass ratio) solution containing 10%-by-mass of a polyvinyl acetal resin contained in the polyvinyl acetal resin material, which is measured at 20° C. and 30 rpm using a Brookfield-type (B-type) viscometer, is 100 to 1,000 mPa.Math.s, and the amount of a plasticizer in the polyvinyl acetal resin film is 0 to 20% by mass based on a total mass of the polyvinyl acetal resin film.

Interlayers that exhibit superior properties and that provide desirable optical properties when incorporated into laminates, such as windshields, windows or other glazings containing a holographic optical element (HOE) are disclosed. The interlayers, when used in a laminate in conjunction with the HOE film, maintain and do not detract from the HOE film properties.

A method for producing a laminated pane, wherein a first laminating film, a carrier film, and a second laminating film are provided and joined to form a pre-laminate, wherein the first laminating film, the carrier film, and the second laminating film have the same film thickness, a compensating film and the pre-laminate are arranged to form a layer stack between a first pane and a second pane, wherein, parallel to two side edges of the layer stack, in each case a strip-shaped peripheral film is arranged and the compensating film is provided to compensate an offset between the pre-laminate and the peripheral films, and the layer stack including the first pane, the pre-laminate, the compensating film with peripheral films, and the second pane is laminated to form a laminated pane, wherein the first laminating film and the second laminating film have a plasticizer content of less than 15 wt.-%.

Polymer interlayers that have low color for multiple layer panels are disclosed. The use of polymer interlayers having low color provide multiple layer panels with low color and lower yellowness index.

A laminated glass including two facing glass plates and an interlayer film disposed between the two glass plates. The interlayer film has a resin layer having a storage modulus of 1000 MPa or more at a temperature of 25° C. and a frequency of 1×10.sup.5 Hz. The laminated glass may be a windshield for an automobile.

A bonding laminated film for bonding, and a light transmission laminate are provided. The bonding laminating film and the light transmission laminate comprise a first layer comprising a first surface and a second surface opposite to the first surface, and a second layer disposed inside the first layer and comprising a wedge part whose cross section is triangular or trapezoidal in a part or a whole of the second layer. The refractive index of the second layer is higher than the refractive index of the first layer. The bonding laminated film has an overall even thickness, and has anti-double-image elements in a desired area though a bonding laminated film, and has a substantially non-wedge shape.