Film, optical module, transfer film, and method for manufacturing molded article

Abstract

To provide a film that excels in three-dimensional formability.SOLUTION: Provided is a film whose stress relaxation rate calculated by formula 1 is 70% or greater. [Method for measuring stress relaxation rate]: A stripe-shaped test piece is obtained by cutting out the film to length 10 mm×width 30 mm taking one direction of the film as a length direction. This stripe-shaped test piece is stretched in the length direction at a tensile speed of 200 mm / minute under an environment of temperature 25°C and relative humidity 45% by using a tensile test machine and stopped after being drawn to 50% of elongation. The stress value of the film is continuously measured until 30 seconds after stoppage of elongation from the start of stretching. The stress relaxation rate (%) of the film is calculated on the basis of formula 1 where A (N) represents the stress value that exhibited the highest stress within the measurement time and B (N) represents the stress value 30 seconds after stoppage of elongation. Formula 1: stress relaxation rate (%)=(A-B) / A×100.SELECTED DRAWING: Figure 4

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