Laminated glass and automobile door
View Patent ↗A laminated glass provided in an automobile door panel including two panel boards facing each other and seal members provided on facing surfaces of the panel boards at regions along a beltline, the laminated glass being openable and closable by being provided between the two panel boards so as to slide between the seal members, the laminated glass includes: a laminated glass main body including at least two glass plates and an interlayer film sandwiched between the glass plates and having a storage modulus G′ of 1.5×10 6 Pa or more; and a viscoelastic member provided on a surface of the laminated glass main body, the viscoelastic member abutting on the seal member or the panel board and sealing a gap between the seal member or the panel board and the laminated glass main body, at a closed time of the laminated glass.
1. A laminated glass provided in an automobile door panel including two panel boards facing each other and seal members provided on facing surfaces of the panel boards at regions along a beltline, the laminated glass being openable and closable by being provided between the two panel boards so as to slide between the seal members, the laminated glass comprising:
a laminated glass main body including at least two glass plates and an interlayer film sandwiched between the glass plates and having a storage modulus G′ of 1.5×10 6 Pa or more measured by a dynamic viscoelasticity test under a condition at a frequency of 1 Hz, a dynamic shearing strain of 0.015%, and a temperature of 20° C.; and
a viscoelastic member provided on a surface of the laminated glass main body, the viscoelastic member abutting on the seal member or the panel board and sealing a gap between the seal member or the panel board and the laminated glass main body, at a closed time of the laminated glass
wherein the viscoelastic member has a smaller thickness at a closed state of the laminated glass than at an opened state.
2. The laminated glass according to claim 1 , wherein
the interlayer film has a three-layer structure composed of a core layer of a single layer and a pair of skin layers holding the core layer sandwiched therebetween.
3. The laminated glass according to claim 2 , wherein storage moduli G′ of the skin layers are larger than a storage modulus G′ of the core layer.
4. The laminated glass according to claim 2 , wherein a storage modulus G′ of the core layer is 1.0×10 4 Pa or more and 1.0×10 7 Pa or less.
5. The laminated glass according to claim 2 , wherein storage moduli G′ of the skin layers are 5.0×10 6 Pa or more and 1.3×10 8 Pa or less.
6. The laminated glass according to claim 2 , wherein the core layer and the skin layers are made of a polyvinyl acetal resin.
7. The laminated glass according to claim 1 , wherein
in the viscoelastic member, a Young's modulus E (N/m 2 ) at a temperature of 20° C. and a loss factor tan(δ) at a frequency of 4000 Hz and a temperature of 20° C. satisfy the following expression (1)
E
≧
2.64
×
10
2
1
+
tan
2
(
δ
)
tan
(
δ
)
.
(
1
)
8. The laminated glass according to claim 1 , wherein the viscoelastic member is formed of a plurality of materials.
9. The laminated glass according to claim 1 , wherein
the viscoelastic member includes a layer formed of a foam.
10. The laminated glass according to claim 1 , wherein
a total thickness of the glass plates is 3.3 mm or less.
11. An automobile door comprising the laminated glass according to claim 1 .
12. The laminated glass according to claim 1 , wherein a thickness of each glass plate is 1.0 mm or more and 2.0 mm or less.
13. The laminated glass according to claim 12 , wherein a thickness of each glass plate is 1.0 mm or more and 1.8 mm or less.
14. The laminated glass according to claim 1 , wherein a storage modulus G′ of the interlayer film is 2.0×10 6 Pa or more.
15. The laminated glass according to claim 14 , wherein a storage modulus G′ of the interlayer film is 3.0×10 6 Pa or more.
16. The laminated glass according to claim 1 , wherein a loss factor of the interlayer film is 0.2 or more and 0.6 or less at at least one resonance point under a frequency of 3 to 6 KHz and a temperature of 20° C.
17. The laminated glass according to claim 1 , wherein the laminated glass main body has a three point bend rigidity of 100 N/mm or more.
18. The laminated glass according to claim 1 , wherein the viscoelastic member has a Young's modulus at 20° C. lower than that of the seal member.
19. The laminated glass according to claim 1 , wherein the viscoelastic member has a loss factor tan(δ) satisfies the following expression (2)
E
≧
1.65
×
10
5
1
+
tan
2
(
δ
)
tan
(
δ
)
.
(
2
)