Patent ID: 8039536
Filing Date: 2011-10-18
Classification: B32B,C08K,C08L,Y10T

Abstract:
1. An interlayer film for a laminated glass which comprises a laminate of films each comprising a poly (vinyl acetal) resin and at least one plasticizer selected from the group consisting of triethylene glycol di-2-ethylhexanoate, tetraethylene glycol di-2-ethylhexanoate, triethylene glycol di-n-heptanoate, and tetraethylene glycol di-n-heptanoate, and 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, wherein the amount of the plasticizer relative to 100 weight parts of the poly (vinyl acetal) resin is larger in at least on constituent layer than that in the other layer or layers by not less than 5 weight parts, and wherein at least on constituent layer is such that the poly (vinyl acetal) resin contains a metal oxide microparticle heaving heat ray-shielding function, wherein the level of addition of the metal oxide microparticle is 0.13 to 3.0 weight parts based on 100 weight parts of the poly(vinyl acetal) resin.