Bonding film, and light-transmitting laminate including same
Embodiment relates to film for bonding, and a light-transmitting laminate including the same and the like, a film for bonding comprising an embossed surface, wherein the embossed surface has an A2/A1 value of 1 or less are disclosed. A film for bonding have improved in deairing stability during formation of a light transmitting laminate, an edge sealing characteristic, and the like by controlling characteristics of a embossed surface.
1. A film for bonding comprising:
an embossed surface,
wherein the embossed surface has an A2/A1 value of 1 or less, and
a thickness increasing area,
wherein the thickness increasing area has both ends which are one end and the other end, and
a thickness of the one end is different from a thickness of the other end, and
wherein the A1 value is 0.5 or more.
2. The film for bonding of claim 1 ,
a wedge angle (θ) is calculated by below Equation 1, and
wherein the wedge angle of the thickness increasing area is 0.01 to 0.04°;
θ
=
arc
tan
(
H
b
-
H
a
w
)
[
Equation
l
]
wherein in the Equation 1,
the Hb is a thickness of thicker one between the one end and the other end of the thickness increasing area,
the Ha is a thickness of thinner one between the one end and the other end of the thickness increasing area, and
the w is a width from the one end to the other end of the thickness increasing area.
3. The film for bonding of claim 2 ,
wherein a ratio of the Ha to the w is 0.0002 to 0.0015.
4. The film for bonding of claim 1 ,
wherein the thickness increasing area of the film for bonding is deposited at a part or all of the film for bonding.
5. The film for bonding of claim 1 ,
wherein the embossed surface has a Sz value of 30 to 90 um.
6. The film for bonding of claim 2 ,
wherein the embossed surface has a Sz value of 40 to 80 um.
7. The film for bonding of claim 1 ,
wherein the A2 value is 0.6 or less.
8. The film for bonding of claim 1 ,
wherein the film for bonding is a single layer film or a laminated film with two or more layers, and
comprises a polyvinyl acetal resin.
9. The film for bonding of claim 1 ,
wherein the film for bonding comprises a sound insulating layer.
10. A light-transmitting laminate comprising:
a first light transmitting layer;
a film for bonding disposed on one surface of the first light transmitting layer; and
a second light transmitting layer disposed on the film for bonding,
wherein the film for bonding has an embossed surface,
wherein the embossed surface has an A2/A1 value of 1 or less,
wherein the film for bonding comprises a thickness increasing area,
wherein the thickness increasing area has both ends which are one end and the other end, and
a thickness of the one end is different from a thickness of the other end, and
wherein total number of bubbles counted at the light-transmitting laminates with a length of 300 mm and a width of 300 mm 3 times is 5 or less.
11. The light-transmitting laminate of claim 1 ,
wherein any one selected from the group consisting of the first light transmitting layer, the second light transmitting layer, and a combination thereof is aged glass.
12. A vehicle comprising the light-transmitting laminate of claim 10 .