The present invention aims to provide an interlayer film for a colored laminated glass which exhibits a visible light transmittance Tv of 5% or lower, small variation in visible light transmittance and an excellent appearance when incorporated in a laminated glass together with two clear glass plates in conformity with JIS R3202 (1996), and a colored laminated glass produced using the interlayer film for a colored laminated glass. Provided is an interlayer film for a colored laminated glass exhibiting a visible light transmittance Tv of 5% or lower when incorporated in a laminated glass together with two clear glass plates in conformity with JIS R3202 (1996), the interlayer film for a colored laminated glass including a laminate of at least two layers including a first resin layer containing a thermoplastic resin and a colorant and a second resin layer containing a thermoplastic resin and no colorant, the first resin layer satisfying a ratio of a difference Δt.sub.1 in thickness between the maximum value t.sub.1max and the minimum value t.sub.1min to an average thickness (Δt.sub.1/average thickness of first resin layer) of 0.30 or less.

An interlayer film for a laminated glass, containing in sequence an A layer, a C layer, and an A layer, and also containing a B layer at any place between or outside these layers, wherein each A layer contains a first thermoplastic resin, a resin material constituting each A layer has a tan δ peak of −30° C. to 10° C., the resin material of at least one layer of the A layers has a peak height of a tan δ of 1.5 or more, the B layer contains a second thermoplastic resin, and is constituted of a resin material different from the resin material constituting the A layer, and the C layer is a layer composed of an inorganic glass having a thickness of 0.1 mm to 1.5 mm, or a layer having a thickness of 0.25 mm to 2.5 mm and containing a third thermoplastic resin.

A functional element having electrically controllable optical properties, includes a stack sequence formed of a first carrier film, a first surface electrode, an active layer, a second surface electrode, and a second carrier film, wherein the second carrier film has an overhanging region beyond the first carrier film and at least one barrier film is arranged on at least one edge region of the first carrier film and the overhanging region of the second carrier film.

The film for glass lamination of the present disclosure comprises a polyvinyl acetal resin, a plasticizer, and a metal salt, wherein the film has an adhesion control effect of 8.5 kgf/cm.sup.2 or more per the metal salt in an amount of 10 ppm based on a total weight of the film.

The present invention provides a film for a liquid crystal device that is a film (15 or 16) used for a liquid crystal device (10) and contains a thermoplastic resin, in which the NI point change of liquid crystal upon contacting the film with the liquid crystal is −2° C. to +2° C.

Provided is an interlayer film for laminated glass having high Young's modulus, high flexural rigidity, and high sound insulating property. An interlayer film for laminated glass according to the present invention has a one-layer or two or more-layer structure, and includes a first layer including an ionomer resin containing polyvinyl acetal into which an acid group is introduced, or containing a (meth)acrylic resin into which an acid group is introduced, and the ionomer resin has a content of the acid group of 1.5% by mole or more and 10% by mole or less, the ionomer resin has a degree of neutralization of 10% or more and 90% or less, and the first layer has a glass transition point within a temperature range between −20° C. and 0° C. inclusive.

A method of producing a polyvinyl butyral resin composition including: preparing a reaction composition including i) a polyvinyl alcohol resin, ii) a butanal, and iii) a butanoic acid; and obtaining the polyvinyl butyral resin composition, wherein a conversion rate of butanal is 77% or more.

A polymer film comprising polyvinyl acetal and a laminated glass manufactured using the same are provided. At least one surface of the polymer film has a void volume (Vv) value at a material ratio of 10% ranging from 2 μm.sup.3/μm.sup.2 to 18 μm.sup.3/μm.sup.2, wherein the void volume (Vv) and material ratio are defined in accordance with ISO 25178-2:2012.

An interlayer film for laminated glass that has one-layer structure or a two or more layer-structure includes a first layer containing a polyvinyl acetal resin and a plasticizer, wherein the first layer has a glass transition temperature of 10° C. or lower, and has an elastic modulus of 285,000 Pa or greater at 30° C.

An interlayer film for laminated glass includes a first layer containing thermoplastic resin and silica particles; and a second layer containing a thermoplastic resin, wherein the first layer has tan δ of 0.8 or greater at 200° C., and wherein the second layer is disposed on a first surface side of the first layer, and has a glass transition temperature higher than a glass transition temperature of the first layer.