1. A multilayer laminated film obtained by alternately
laminating 51 layers or more of a plurality of different
thermoplastic resin layers,
wherein a transmittance of visible light
perpendicularly incident on a surface of the multilayer
laminated film is 50% or more and 100% or less, and when
average reflectances of P-polarized wave at the time of
visible light being incident on the surface of the
multilayer laminated film such that angles formed with a
normal of the surface are 20°, 30°, 40°, 50°, 60°, and 70°
are denoted as Rp20 (%), Rp30 (%), Rp40 (%), Rp50 (%), Rp60
(%), and Rp70 (%) in this order, standard deviations of the
Rp20, the Rp30, the Rp40, and the Rp50 are 5% or less and
the Rp60 and the Rp70 are 3% or more and 50% or less,
where the Rp20 (%), the Rp30 (%), the Rp40 (%), the
Rp50 (%), the Rp60 (%), and the Rp70 (%) are average values
when reflectance of P-polarized wave in a wavelength range
of 400 nm to 700 nm at each incident angle θ of 20°, 30°,
40°, 50°, 60°, and 70° is measured in increments of 1 nm
using a spectrophotometer.
2. The multilayer laminated film according to claim 1,
wherein a minimum value of each of the Rp20, the Rp30, the
WE CLAIM:
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Rp40, the Rp50, the Rp60, and the Rp70 is 3% or more and
50% or less.
3. The multilayer laminated film according to claim 1 or
2, wherein at least one of the Rp30, the Rp40, and the Rp50
among the Rp20, the Rp30, the Rp40, the Rp50, the Rp60, and
the Rp70 takes a minimum value.
4. The multilayer laminated film according to any one of
claims 1 to 3, wherein when the multilayer laminated film
is measured by differential scanning calorimetry (DSC), Tm
- T* > 27 (°C) is satisfied where in a DSC 1st curve
obtained by raising a temperature from 25°C to 300°C at
20°C/min, a melting peak temperature at which an absolute
value of a quantity of absorption heat is maximized is
denoted as Tm (°C) and a temperature determined by the
following measurement method is denoted as T* (°C):
the measurement method of T* is as follows:
T* is determined by the following (1) and (2),
(1) a plurality of intersections of a temperature
differential curve A(T) and a straight line A’(T) = 0.2Amin
in a range of Tmin (°C) or less are defined as Tn (°C) (n =
1, 2, 3,...) in the order of lower temperature where a
temperature differential curve of the DSC 1st curve is
denoted as A(T) = dDSC/dT (mW/°C), a minimum value of A(T)
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in a temperature range of 150 (°C) to Tm (°C) in a graph of
the temperature differential curve A(T) is denoted as Amin,
and a temperature at that time is denoted as Tmin (°C), and
(2) among Tn (°C) satisfying (1), Tn (°C) taking a
minimum temperature among Tn (°C) satisfying A(T) < 0.2Amin
at all times in a temperature range of Tn to Tn + 5°C is
defined as T* (°C).
5. The multilayer laminated film according to claim 4,
wherein in the temperature differential curve A(T), a
maximum value in a range of 150 (°C) to Tm (°C) is 0.040 or
less.
6. The multilayer laminated film according to any one of
claims 1 to 5, wherein saturation of reflected light when
the P-polarized wave is incident on the surface of the
multilayer laminated film such that the angle formed with
the normal of the surface is 60° is 20 or less.
7. The multilayer laminated film according to any one of
claims 1 to 6, wherein in-plane azimuth angle variation of
the reflectance Rp60 when the P-polarized wave is incident
on the surface of the multilayer laminated film such that
the angle formed with the normal of the surface is 60° is
5% or less.
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8. The multilayer laminated film according to any one of
claims 1 to 7, wherein the multilayer laminated film has a
configuration in which a layer (layer A) composed of a
first thermoplastic resin and a layer (layer B) composed of
a second thermoplastic resin are alternately laminated, the
first thermoplastic resin contains a crystalline polyester
as a main component, and the second thermoplastic resin
contains a polyester including a structure derived from
naphthalene dicarboxylic acid as a main component.
9. The multilayer laminated film according to claim 8,
wherein the second thermoplastic resin includes a structure
derived from an alkylene glycol having a number average
molecular weight of 200 or more and 2000 or less.
10. The multilayer laminated film according to any one of
claims 1 to 9, wherein the multilayer laminated film has a
melting point, two or more melting peaks indicating a
fusion enthalpy (ΔHm) of 3 J/g or more by differential
scanning calorimetry (DSC) are present, and a melting peak
of less than 3 J/g is further present on a lower
temperature side than the melting peaks indicating a fusion
enthalpy of 3 J/g or more.