Patent ID: 9581730
Date: 2017-02-28
CPC Classifications: B29C,B29K,B29L,B32B,C08G,C08J,G02B

Claim:
1. A laminate, comprising: an elongatable substrate film satisfying the following Formula 1; and a polarizable material layer formed on either or both surfaces of the substrate film, wherein an absolute value of a difference (A−B) between an integral value (A) of an elongation curve of the substrate film and an integral value (B) of an elongation curve of the polarizable material layer is in a range from 1,500 to 10,000 Nmm: where, in Formula 1, E denotes an elongation having an unit of % of the elongatable substrate film measured at room temperature, R denotes a restoration ratio having an unit of %, the restoration ratio is measured such that a laminate manufactured by adhering a polyvinyl alcohol film having the same horizontal and vertical lengths as the substrate film and a thickness of 30 μm to a surface of the substrate film cut to a horizontal length of 50 mm and a vertical length of 100 mm is elongated 5 times in a vertical direction in water having a temperature of 60° C., is taken out of the water, the polyvinyl alcohol film is released, the laminate is maintained for 1 hour at room temperature, a length (T) of the substrate film in a vertical direction is measured, and the measured value is assigned to Formula ┌100×(T−A)/A┘, where A in the Formula is a vertical length of the substrate film before the elongation, wherein the elongation of the substrate film is in a range of 200% to 1500%, and the substrate film comprises a thermoplastic polyurethane.