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 disclosure relates to a polymer film comprising at least one first layer and at least one second layer, the first layer and the second layer each comprising a polyvinyl acetal resin and a plasticizer; wherein the polymer film has a first loss factor peak value at −20° C. to 20° C., and a second loss factor peak value at 20° C. to 50° C.; wherein the polymer film has a loss factor valley value between the first loss factor peak value and the second loss factor peak value, the loss factor valley value is 0.15 to 0.45, and the loss factor of the polymer film at 10° C. is less than 0.5. The polymer film can still maintain good sound insulation performance at a specific ambient temperature and/or after a period of time.

The present disclosure relates to a polymer film comprising a polyvinyl acetal resin and a plasticizer, wherein the polymer film comprises at least one first layer and at least one second layer, and the loss factor of the first layer and the loss factor the second layer are different; furthermore, the ratio of the loss factor of the first layer to that of the second layer is 1.30 to 3.12. The polymer film provided herein has an improved sound insulation effect.

The present disclosure relates to a polymer film comprising a polyvinyl acetal resin and a plasticizer, wherein the polymer film is single-layer or multilayer a smallest value of a loss factor of the polymer film occurs at a temperature ranging from 40° C. to 60° C. The polymer film provided herein exhibits improved fluidity and processability.

The present invention provides an interlayer film for laminated glass which has excellent sound insulating properties even when the thickness is reduced, and also hardly causes optical unevenness.

An interlayer film for laminated glass includes at least one layer A containing a thermoplastic elastomer, wherein the shear storage modulus of the layer A at 70° C. as measured by performing a dynamic viscoelasticity test at a frequency of 1,000 Hz in accordance with ASTM D4065-06 is 1 MPa or more, and a layer having a higher shear storage modulus than the layer A is provided on at least one surface of the layer A, and at least one surface of the interlayer film for laminated glass is in a state of having been shaped.

A polymer interlayer comprising a layer comprising a poly(vinyl acetal) resin having a residual hydroxyl content and a residual acetate content, and a plasticizer, wherein the residual hydroxyl content, the residual acetate content and the plasticizer are selected such that the polymer interlayer has at least one glass transition temperature less than about 20° C. and a peak tan delta of greater than 1.33, and a glass panel having a configuration of 2.3-mm glass//interlayer//2.3-mm glass and at 20° C. has a transmission loss, TL.sub.w, of greater than 42 decibels as measured by weighted average sound transmission loss at 2000 to 8000 Hz, and a transmission loss, TL.sub.c, of greater than 38 decibels at the coincident frequency is disclosed.

Multilayered interlayers having good acoustic properties comprising a stiff skin layer(s) and a soft core layer(s) are disclosed. The multilayered interlayers comprise: a first polymer layer (skin layer) comprising plasticized poly(vinyl acetal) resin; a second polymer layer (core layer) comprising plasticized poly(vinyl acetal) resin; wherein at least one plasticizer is a high refractive index plasticizer. The multilayered interlayers have low mottle and resist mottle formation.

Resin compositions, layers, and interlayers comprising two or more thermoplastic polymers and at least one RI balancing agent for adjusting the refractive index of at least one of the resins or layers is provided. Such compositions, layers, and interlayers exhibit enhanced optical properties while retaining other properties, such as impact resistance and acoustic performance.

To provide a laminated glass excellent in edge foaming resistance and rigidity. Laminated glass 1 in which a pair of glass plates and an intermediate film 4 provided between the pair of glass plates, are laminated, wherein the shear storage modulus of said intermediate film 4 is from 2 to 100 MPa, and the outer peripheral edge of the intermediate film 4 is present inside than the outer peripheral edges of the two glass plates constituting said pair of glass panels, at least at a part of the entire outer periphery of the laminated glass 1.

There is provided an interlayer film for laminated glass which is capable of enhancing sound insulating properties in the laminated glass obtained in the case of being used for constituting the laminated glass, and laminated glass prepared using the interlayer film for laminated glass. An interlayer film for laminated glass according to the present invention includes a modified polyvinyl acetate and a plasticizer, and the modified polyvinyl acetate has a vinyl acetate structural unit and a fatty acid vinyl ester structural unit; the laminated glass according to the present invention includes a first laminated glass constituent member, a second laminated glass constituent member, and an interlayer film sandwiched between the first and second laminated glass constituent members, and in the laminated glass according to the present invention, the interlayer film is the interlayer film for laminated glass described above.