The present invention aims to provide an interlayer film for a laminated glass which has a multilayer structure including two or more resin layers laminated together and can prevent optical distortion even at high temperatures, a laminated glass including the interlayer film for a laminated glass, and a method of producing the interlayer film for a laminated glass. The present invention relates to an interlayer film for a laminated glass, the interlayer film including: two or more resin layers laminated together, one resin layer having a surface with a ratio (Rz/Sm) of a ten-point average roughness Rz (μm) to an average interval Sm (μm) of projections and recesses of 0.0018 or less as measured in conformity with JIS B-0601(1994) in the following manner: a laminated glass is produced using two clear glass sheets conforming to JIS R3202(1996) and the interlayer film; the interlayer film is peeled away from the clear glass sheets after the laminated glass is cooled with liquid nitrogen; the one resin layer is peeled away from another resin layer that is in direct contact with the one resin layer; and the Rz and Sm of the surface of the one resin layer on the side having been in contact with the other resin layer are measured.

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.

There is provided an interlayer film for laminated glass which is high in heat shielding properties. The interlayer film for laminated glass according to the present invention includes an infrared ray reflection layer which reflects infrared rays, a first resin layer which is arranged on a first surface side of the infrared ray reflection layer and contains a thermoplastic resin and a second resin layer which is arranged on a second surface side of the infrared ray reflection layer and contains a thermoplastic resin, and the infrared ray transmittance in the wavelength of 780 to 2100 nm of the first resin layer is higher by 10% or more than the infrared ray transmittance in the wavelength of 780 to 2100 nm of the second resin layer.

To provide a functional film with which a functional laminated glass excellent in adhesion between layers can be obtained, and a functional laminated glass excellent in adhesion between layers.

A functional film (transmission image display film 10) comprising a substrate film (transparent film 11) and a functional layer (light scattering layer 12) containing an organic material, which has a deposited layer (first deposited layer 13, second deposited layer 14, third deposited layer 15) formed of an inorganic oxide having an isoelectric point of at most 6 or at least 7.4 as measured by streaming potential method, either one of or both on the outermost surface of the functional film and between the substrate film and the functional layer.

Provided is an interlayer film for laminated glass which produces a high contrast image under light radiation, is less susceptible to color changes, and allows for control of the adhesion, as well as a laminated glass including the interlayer film. The interlayer film includes a light emitting layer containing a polyvinyl acetal, a light emitting material having a terephthalic acid ester structure, and a potassium salt.

There is provided an interlayer film for laminated glass with which the adhesive force between the interlayer film and a laminated glass member of the laminated glass can be effectively improved. The interlayer film for laminated glass according to the present invention has one-layer structure or a two or more-layer structure, is provided with a first layer containing a thermoplastic resin, a plasticizer and a metal element as a surface layer of the interlayer film, and the first layer is a first layer having a contact angle of greater than 40.1° when measured by a sessile drop method using diiodomethane or a first layer having a contact angle of greater than 54.2° when measured by a sessile drop method using ethylene glycol.

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.

There is provided an interlayer film for laminated glass with which the sound insulating properties in a high frequency area of 2000 Hz or more can be effectively enhanced. The interlayer film for laminated glass according to the present invention has a two or more-layer structure and is provided with a first layer containing a thermoplastic resin and a second layer containing a thermoplastic resin, the second layer is arranged on a first surface side of the first layer, and the interlayer film is provided with Constitution A: “the glass transition temperature of the second layer being 32° C. or more, the glass transition temperature of the first layer being lower than the glass transition temperature of the second layer, and the thickness of the interlayer film being more than 787 μm and 950 μm or less” or Constitution B: “the glass transition temperature of the second layer being 25° C. or more, the glass transition temperature of the first layer being lower than the glass transition temperature of the second layer, and the thickness of the interlayer film being more than 950 μm”.