Interlayer for laminated glass, and laminated glass
View Patent ↗An interlayer film for laminated glass that suppresses the transmittance of ultraviolet rays with a wave length of 400 nm to 1% or less, and has high light resistance. The interlayer film for laminated glass comprises a thermoplastic resin, an ultraviolet absorber having a structure of formula (1), and an ultraviolet absorber having a structure of formula (2), wherein the amount of the ultraviolet absorber of formula (1) is 0.001 to 0.05% by weight, and the amount of the ultraviolet absorber of formula (2) is 0.5 to 1.0% by weight; wherein R 1 is a C 1-3 alkyl group; R 2 is hydrogen, a C 1-10 alkyl group, or a C 7-10 aralkyl group; R 3 is hydrogen or a C 1-8 alkyl group; and R 4 is hydrogen or a C 1-8 alkyl group.
1. An interlayer film for laminated glass comprising:
a thermoplastic resin,
an ultraviolet absorber having a structure of the following formula (1), and
an ultraviolet absorber having a structure of the following formula (2),
wherein an amount of the ultraviolet absorber having the structure of formula (1) is 0.001 to 0.05% by weight, and an amount of the ultraviolet absorber having the structure of formula (2) is 0.5 to 1.0% by weight;
wherein R 1 is a C 1-3 alkyl group; R 2 is hydrogen, a C 1-10 alkyl group, or a C 7-10 aralkyl group; R 3 is hydrogen or a C 1-8 alkyl group; and R 4 is hydrogen or a C 1-8 alkyl group.
2. The interlayer film for laminated glass according to claim 1 , further comprising triethylene glycol di-2-ethylhexanoate.
3. The interlayer film for laminated glass according to claim 1 , wherein the thermoplastic resin is a polyvinyl acetal resin.
4. The interlayer film for laminated glass according to claim 1 , wherein the thermoplastic resin is a polyvinyl butyral resin.
5. The interlayer film for laminated glass according to claim 1 , wherein the amount of the ultraviolet absorber having the structure of formula (1) is 0.01 to 0.04% by weight, and the amount of the ultraviolet absorber having the structure of formula (2) is 0.6 to 1.0% by weight.
6. The interlayer film for laminated glass according to claim 1 , further comprising an infrared absorbing agent.
7. The interlayer film for laminated glass according to claim 6 , wherein the infrared absorbing agent is made of tin-doped indium oxide particles.
8. The interlayer film for laminated glass according to claim 1 , wherein a cross-section of the interlayer film for laminated glass is a wedge shape with a wedge angle θ of 0.1 to 1.0 mrad.
9. The interlayer film for laminated glass according to claim 1 , comprising a sound-insulation layer.
10. The interlayer film for laminated glass according to claim 1 , wherein at least one part of the interlayer film for laminated glass is colored.
11. The interlayer film for laminated glass according to claim 1 , wherein a yellowness index is 5 or less when the interlayer film for laminated glass is set to have a thickness of 760 μm and sandwiched between two glass plates.
12. The interlayer film for laminated glass according to claim 1 , wherein a visible light transmission Tv is 70% or more after the interlayer film for laminated glass is set to have a thickness of 760 μm, sandwiched between two glass plates, and irradiated with ultraviolet rays for 2,000 hours using an ultraviolet rays irradiation device in accordance with JIS R 3205 (1998).
13. The interlayer film for laminated glass according to claim 1 , wherein a yellowness index is 5 or less after the interlayer film for laminated glass is set to have a thickness of 760 μm, sandwiched between two glass plates, and irradiated with ultraviolet rays for 2,000 hours using an ultraviolet ray irradiation device in accordance with JIS R 3205 (1998).
14. The interlayer film for laminated glass according to claim 1 , wherein the interlayer film for laminated glass has an absolute value of 1 or less, where the absolute value is given by the difference between the transmittance of ultraviolet rays with a wave length of 400 nm of the interlayer film for laminated glass, after being set to have a thickness of 760 μm and sandwiched between two glass plates, and the transmittance of ultraviolet rays with a wave length of 400 nm of the interlayer film for laminated glass, after being set to have a thickness of 760 μm, sandwiched between two glass plates, and irradiated with ultraviolet rays for 2,000 hours using an ultraviolet ray irradiation device in accordance with JIS R 3205 (1998).
15. A laminated glass comprising:
the interlayer film for laminated glass according to claim 1 , and
two glass plates,
wherein the interlayer film for laminated glass is sandwiched between the two glass plates.
16. The laminated glass according to claim 15 , wherein the glass plates are made of 2-mm-thick green glass.