Interlayer film for laminated glass and laminated glass

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

C03C 27/12 (2006.01) B32B 17/10 (2006.01) C08L 29/14 (2006.01)

Patent

CA 2400987

The invention provides an interlayer film for a laminated glass and a laminated glass, which are protected against a slump in TL value through attenuation of said coincidence effect and adapted to display an outstanding sound insulation performance over a broad temperature range. An interlayer film for a laminated glass comprising a plasticizer and a polyacetal resin, which is a blend of a polyacetal resin having an average polymerization degree of 1,000 to 3,000 and a polyacetal resin having an average polymerization degree of 3,000 to 5,000, and which has an acetalization degree of 60 to 85 mol % and an acetyl group content of 8 to 30 mol %. An interlayer film for a laminated glass which shows a temperature dependence of loss tangent in which the lowest-temperature side maximum of loss tangent appears at 30°C or lower when examined for dynamic viscoelasticity.

L'invention se rapporte à un film intercouches pour verres feuilletés qui empêche une décroissance de la valeur TL par amoindrissement de l'effet de coïncidence et qui s'avère hautement efficace en tant qu'isolant phonique dans une gamme étendue de température. Ce film intercouches comporte: un mélange de résines polyacétal qui comprend une résine polyacétal possédant un degré moyen de polymérisation compris entre 1000 et 3000 et une résine polyacétal possédant un degré moyen de polymérisation compris entre 3000 et 5000, ledit mélange ayant un degré d'acétalisation compris entre 60 et 85 %, en pourcentage molaire, ainsi qu'une teneur en groupe acétyle comprise entre 3 et 30 %, en pourcentage molaire; et un agent plastifiant. Ce film intercouches, lorsqu'on analyse sa viscoélasticité dynamique, présente une dépendance du facteur de dissipation vis à vis de la température qui est telle que le maximum du facteur de dissipation du côté de la température la plus basse apparaît à une température inférieure ou égale à 30 DEG C.

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