PET Laminated Glass Interlayer for Low Haze at 100°C
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Solution Overview
Problem
Conventional laminated glass using a polyethylene terephthalate film exhibits high haze values during heat resistance tests at 100°C, which is not an issue with films lacking this material.
Innovation Solution
An interlayer film for laminated glass is designed with a specific absorbance ratio of 0.50 or less at 1930 nm to 1705 nm, comprising a first resin layer, a polyethylene terephthalate film, and a second resin layer, utilizing thermoplastic resins like polyvinyl acetal, to maintain low haze values under heat stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyethylene terephthalate film is used as an interlayer film to enhance heat shielding property or strength, then the heat shielding property or strength is improved, but the haze value becomes high during heat resistance tests at 100°C
Solution Approach 1:
The patent applies parameter changes by controlling the absorbance ratio at specific wavelengths (1930 nm and 1705 nm) to 0.50 or less. This parameter control modifies the optical properties of the polyethylene terephthalate film, allowing it to maintain both strength and low haze value during heat resistance tests at 100°C.
Solution Approach 2:
The patent uses a composite interlayer film structure consisting of a polyethylene terephthalate film combined with resin layers containing specific compounds (such as cyclotrioxane, triethylene glycol, or their copolymers). This composite structure enhances both the mechanical strength and heat shielding properties while maintaining low haze values under thermal stress.
2Temperature
If a polyethylene terephthalate film is used as an interlayer film to enhance heat shielding property, then the heat shielding property is improved, but the haze value becomes high during heat resistance tests at 100°C
Solution Approach 1:
The patent controls the absorbance ratio at 1930 nm to 1705 nm to 0.50 or less, which modifies the thermal and optical characteristics of the polyethylene terephthalate film. This parameter adjustment enables the film to provide effective heat shielding while maintaining low haze values during heat resistance tests.
Solution Approach 2:
The patent creates a composite film by combining polyethylene terephthalate with specific resin compounds (cyclotrioxane, triethylene glycol, or their copolymers). This composite structure enhances heat shielding capability while the specific resin components prevent haze formation during thermal exposure, resolving the contradiction between heat shielding and haze control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The interlayer film effectively maintains low haze values during heat resistance tests, enhancing adhesivity and maintaining performance in high-temperature environments.
Implementation Method 1
having a ratio of absorbance A at a wavelength of 1930 nm to absorbance B at a wavelength of 1705 nm of 0.50 or less
Data Source
Figure 1~3
AI summary
Provided is an interlayer film for laminated glass capable of keeping the haze value low when a heat resistance test at 100°C is conducted for the laminated glass, although the interlayer film has a polyethylene terephthalate film. An interlayer film for laminated glass according to the present invention includes a first resin layer containing a thermoplastic resin, a polyethylene terephthalate film, and a second resin layer containing a thermoplastic resin, in this order, and has a ratio of absorbance A at a wavelength of 1930 nm to absorbance B at a wavelength of 1705 nm of 0.50 or less.