A multilayer interlayer structure having a first and second polyvinyl acetal (poly(vinyl acetal)) layer and a cellulose ester layer having a thickness of at least 10 mils disposed between the first and second poly(vinyl acetal) layers. The cellulose ester layer can have a higher storage modulus and/or higher Tg than at least one of the poly(vinyl acetal) layers. The interlayer structure is useful to make glass panels having high stiffness and which possess good optical clarity for a variety of applications, including outdoor structural applications.

The present invention aims to provide an interlayer film for laminated glass capable of displaying images with a high luminous intensity when irradiated with a light beam, and a laminated glass including the interlayer film for laminated glass. The present invention relates to an interlayer film for laminated glass, including a light-emitting layer that contains a thermoplastic resin and a lanthanoid complex with a polydentate ligand containing a halogen atom, the light-emitting layer containing not more than 50 ppm in total of potassium, sodium, and magnesium.

Provided is laminated glass capable of preventing generation of a projection in the interlayer film in an end part of laminated glass, and keeping the appearance of laminated glass excellent. Laminated glass according to the present invention is laminate glass including a first lamination glass member, a second lamination glass member, and an interlayer film containing a thermoplastic resin, and when a light irradiation test: conducting 4 cycles each cycle including the process of irradiating the laminated glass with xenon light at a black panel temperature of 83 C. and a humidity of 50% RH for 144 hours, and dipping the laminated glass in pure water at 80 C. for 24 hours is conducted in the laminated glass, a ratio of a weight average molecular weight of the thermoplastic resin at a position of 2 mm inwardly from an end part of the laminated glass, to a weight average molecular weight of the thermoplastic resin at a position of 70 mm inwardly from an end part of the laminated glass is more than 0.5.

The present invention aims to provide an interlayer film for laminated glass which prevents a double image phenomenon in a specific area of laminated glass and enables display of high contrast images at a luminance within a certain range. The present invention also aims to provide a laminated glass including the interlayer film for laminated glass. The present invention relates to an interlayer film for laminated glass, having a multilayer structure including a luminescent layer and a resin layer on at least one surface of the luminescent layer. The luminescent layer contains a thermoplastic resin, a plasticizer, and a luminescent material. The resin layer contains a thermoplastic resin and a plasticizer. The interlayer film for laminated glass has a wedge-shaped cross-sectional shape. The luminescent layer has a difference between the maximum thickness and the minimum thickness of 100 m or less.

Embodiments relate to a resin film for laminated glass, laminated glass comprising the resin film, and a process for manufacturing the laminated glass. The resin film for laminated glass comprises a resin layer comprising a polyvinyl acetal resin and a contact surface in direct contact with glass, wherein the contact surface has an Rz roughness of 25 to 90 m and a maximum static friction coefficient at 20 C. of 0.85 to 1.60, and the compressive elastic deformation index measured in the perpendicular direction from the contact surface at 35 C. is 40 to 310 m/N.

There is provided an interlayer film for laminated glass with which the visible light transmittance and the heat resistance of the laminated glass can be heightened. The interlayer film for laminated glass according to the present invention includes an organic coloring matter containing a transition element, a metal element which is different from a metal element contained in a metal oxide particle and different from a transition element, a thermoplastic resin and a plasticizer.

Provided is laminated glass capable of preventing generation of a void in the interlayer film in an end part of laminated glass, and keeping the appearance of laminated glass excellent. Laminated glass according to the present invention is laminate glass including a first lamination glass member, a second lamination glass member, and an interlayer film containing a thermoplastic resin, and no void is generated in the interlayer film irradiated with light in an end part of the laminated glass after a first light irradiation test: conducting 4 cycles each cycle including the process of irradiating the laminated glass with xenon light 180 W/m.sup.2 at a black panel temperature of 83 C. and a humidity of 50% RH for 144 hours, and dipping the laminated glass in pure water at 80 C. for 24 hours, or a void is generated within a length of 1 mm or less inwardly from an end part of the interlayer film irradiated with light in the end part of the laminated glass after the first light irradiation test.

Provided is an interlayer film for laminated glass with which the sound insulating properties of laminated glass can be enhanced. The 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 first layer having a glass transition temperature in dynamic viscoelasticity measurement of 30 C. or more and 10 C. or less, and when a glass transition temperature in unit C. of the first layer is referred to as Tg, a loss tangent tan of the first layer at Tg satisfies both of the following formula (1) and formula (2):

(Loss tangent tan of the first layer at Tg)1.55(1)

(Loss tangent tan of the first layer at Tg)=A(first storage modulus G of the first layer at Tg10 C./second storage modulus G of the first layer at Tg+10 C.)+B(2) in the above formula (2), A is 0.003 or more and 0.04 or less, and B is 0.7 or more and 1.4 or less.

A polymer composition comprising a first poly(vinyl butyral) resin having a first residual hydroxyl content; a second poly(vinyl butyral) resin having a second residual hydroxyl content; a plasticizer; and at least one compatibilizer, such as an anhydride compatibilizer; wherein the difference between the first and second residual hydroxyl contents is at least 2 wt. %, and wherein the polymer composition has a percent haze of less than 5%. The use of a compatibilizer reduces or minimizes the optical defects, such as haze and color, without sacrificing other characteristics of the composition. The composition may be used in an interlayer.

An interlayer film for laminated glass that has a one-layer structure or a two or more layer-structure includes a first layer containing a thermoplastic resin, wherein the first layer has a glass transition temperature of 10 C. or lower, and wherein the interlayer film has an equivalent stiffness of 2.4 MPa or greater at 25 C.