Laminated film for bonding and light-transmitting laminate including same

Abstract

According to an embodiment, a laminated film or the like for bonding comprises: a first layer in direct contact with an object to be bonded; a second layer facing the first layer; and a third layer interposed between the first layer and the second layer, wherein one end and the other end of the laminated film have different thicknesses from each other, the laminated film includes a measurement area, the measurement area has a central thickness, the central thickness is not greater than the average value of the thickness at the one end and the thickness at the other end, and the penetration coefficient (F pe) evaluated in the measurement area is at least 1.35 kgf / mm 2*mm. The laminated film can provide a light-transmitting laminate or the like having excellent penetration resistance, sound-insulating characteristics, and head-up display functionality.

Description

technical field [0001] Embodiments relate to a laminated film having acoustic properties and improved penetration resistance, a light transmissive laminate including the same for use as a windshield, and the like. [0002] [Cross-reference to related applications] [0003] This application claims the benefit of priority from Korean Patent Application No. 10-2019-0077684 filed on Jun. 28, 2019, the entirety of which is incorporated herein by reference. Background technique [0004] Polyvinyl acetal is used as a bonding glass (safety glass) or an intermediate layer (film for bonding glass) of a light-transmitting laminate. Bonded glass is mainly used for building windows, exterior materials, etc., and automobile window glass. Even if the bonded glass is damaged, the fragments will not be scattered, and even if the bonded glass is hit with a certain strength, it is not allowed to penetrate. As with the above characteristics, the bonded glass can ensure stability so as to be a...

AI Technical Summary

Problems solved by technology

[0006] The fundamental problem with head-up displays is that since the projector image is projected onto the car's windshield, the image is reflected on both surfaces of the windshield (inner and outer) so that the driver not only perceives The desired primary image is also perceived with a weaker intensity as the secondary image (ghost image, ghost image)

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