Patent ID: 7160624

Claim:
An interlayer film for a laminated glass, wherein the film is made of plasticized polyvinylacetal resin composition, the plasticized polyvinylacetal resin composition contains 100 parts by weight of a polyvinylacetal resin, 20 to 60 parts by weight of a plasticizer and 0.1 to 3 parts by weight of at least one kind of a fine particle selected from the group consisting of a tin-doped indium oide (ITO) fine particle, an antimony-dope tin oxide (ATO) fine particle, an aluminum-doped zinc oxide (AZO) fine particle, an indium-dope zinc oxide (IZO) fine particle, a tin-doped zinc oxide fine particle, a silicon-doped zinc oxide fine particle, a lanthanum hexaboride fine particle and cerium hexaboride fine particle, and the fine particle has an average particle diameter of 80 nm or less, and a particle having a particle diameter of 100 nm or more is dispersed in a density of one particle/μm 2 or less, and wherein the plasticized polyvinylacetal resin composition further contains a malonic ester compound and/or an oxalic acid anilide compound as an ultraviolet absorber, and wherein a laminated glass, produced by interposing the film between two sheets of glass selected from the group consisting of clear glass, green glass and high heat ray absorbing glass, has the decrease of the visible light transmittance of the laminated glass after irradiating the ultraviolet ray of 2.0% or less, when irradiated with ultraviolet ray with an intensity of 100 mW/cm 2 and wavelength of 295 to 450 nm for 300 hours.