Plastic intermediate film, laminate including same, and mobility means including same
The plastic intermediate film includes a sound insulating layer, wherein the sound insulating layer comprises a polyvinyl acetal resin, a plasticizer, and a refractive index regulator, wherein the refractive index regulator is particles with average diameter (D 50 ) of 100 nm or less and has an absolute refractive index of 2.0 or more, wherein the refractive index regulator is comprised in an amount of more than 0 wt % and 1 wt % or less based on the entire sound insulating layer, and wherein the plasticizer is comprised in an amount of 33 to 41 wt % based on the entire sound insulating layer.
1. A plastic intermediate film comprising:
a sound insulating layer,
wherein the sound insulating layer comprises a polyvinyl acetal resin, a plasticizer, and a refractive index regulator,
wherein the refractive index regulator is particles with average diameter (D 50 ) of 100 nm or less and has an absolute refractive index of 2.0 or more,
wherein the refractive index regulator is comprised in an amount of more than 0 wt % and 1 wt % or less based on the entire sound insulating layer, and
wherein the plasticizer is comprised in an amount of 33 to 41 wt % based on the entire sound insulating layer.
2. The plastic intermediate film of claim 1 ,
wherein one surface of the sound insulating layer has Sz value (surface roughness value) of 20 μm or less as surface roughness.
3. The plastic intermediate film of claim 1 , further comprising a first layer disposed on one surface of the sound insulating layer,
wherein the plastic intermediate film has an Rsc value of 0 to 1 according to below Equation 1:
Rsc= 1−(a refractive index of the first layer−a refractive index of the sound insulating layer)*100. [Equation 1]
4. The plastic intermediate film of claim 3 , having an optical distortion index (A) of 30 μm or less expressed by below Equation 2:
A=Sz/Rsc [Equation 2]
wherein, in the Equation 2, Sz is surface roughness (μm) of the one surface of the sound insulating layer, and Rsc is a value according to Equation 1.
5. The plastic intermediate film of claim 1 , having a haze value of 3% or less.
6. The plastic intermediate film of claim 1 , having an L/F (loss factor) of 0.34 or more.
7. The plastic intermediate film of claim 1 , having a long-term durability evaluation value (YH) of 1.2 or less according to below Equation 3:
YH=dY.I.*dH [Equation 3]
wherein, in the Equation 3, YH is a long-term durability evaluation value, dY.I. is a value obtained by subtracting a yellow index value of the plastic intermediate film before an EMMAQUA test using an exposed energy of 500 K Langley from a yellow index value of the plastic intermediate film after passing the EMMAQUA test, and dH is a value obtained by subtracting a haze value of the plastic intermediate film before an EMMAQUA test using an exposed energy of 500 K Langley from a haze value of the plastic intermediate film after passing the EMMAQUA test.
8. The plastic intermediate film of claim 1 , wherein the dY.I. value of the plastic intermediate film is 3.5 or less.
9. The plastic intermediate film of claim 1 , wherein the refractive index regulator has a particle diameter difference between D 10 and D 90 within 1.5 times of D 50 .
10. A laminate comprising:
a first light transmitting layer;
the plastic intermediate film of claim 1 disposed on the first light transmitting layer; and
a second light transmitting layer disposed on the plastic intermediate film.
11. A mobility means, comprising the laminate according to claim 10 as a windshield.