Laminated Glass Interlayer Film for Angle-Dependent Hue Change
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Solution Overview
Problem
Conventional interlayer films for laminated glass do not adequately change hues of transmitted and reflected light depending on viewing angle, lacking sufficient aesthetic quality.
Innovation Solution
An interlayer film with a first resin layer that meets specific criteria for differences in a* and b* values of transmitted and reflected light at varying angles, incorporating fillers such as metal oxides and non-metal materials to enhance aesthetic quality through color changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional interlayer films blend pigment or dye for coloration, then the interlayer film has basic coloration function, but the hue change depending on viewing angle is insufficient and aesthetic quality is inadequate
Solution Approach 1:
The patent changes the physical and chemical parameters of the resin layer by controlling the glass transition temperature (Tg) to be 50°C or higher, and adjusting the ratio of hydroxyl groups to acetal groups. These parameter changes enable the resin to exhibit iridescent coloration with significant hue changes depending on viewing angle, thereby improving aesthetic quality while maintaining manufacturability
Solution Approach 2:
The patent creates a composite material system where the resin layer contains specific functional components with controlled molecular structures. The composite nature of the resin, with specific ratios of hydroxyl and acetal groups, enables both the coloration function and the viewing-angle-dependent hue changes, resolving the contradiction between basic coloration and aesthetic quality
2Object-affected harmful factors
If metal particles are blended for heat shielding performance, then heat shielding is enhanced, but the aesthetic quality through natural coloration is reduced
Solution Approach 1:
The patent extracts the heat shielding function from the coloration function by using metal particles specifically for heat reflection while the resin layer itself provides the aesthetic coloration. This separation allows the resin to exhibit viewing-angle-dependent hue changes without relying on metallic pigments, thus maintaining both heat shielding performance and aesthetic quality
Solution Approach 2:
The resin layer acts as an intermediary between the metal particles and the external environment. The metal particles provide heat shielding while the resin layer provides the aesthetic coloration effect. This intermediary role allows both functions to coexist without compromising aesthetic quality
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 provides enhanced aesthetic quality by changing hues of transmitted and reflected light based on viewing angle, ensuring high transparency and design appeal.
Implementation Method 1
an interlayer film for laminated glass having a first resin layer, wherein a difference between a maximum value and a minimum value of a* of transmitted light obtained at incident angles of 5°, 20°, 40°, and 60° in an L*a*b* color system for the first resin layer is 3.0 or more and 15.0 or less
Data Source
Figure 1~2
Figure 3
AI summary
An interlayer film for laminated glass having a first resin layer, wherein a difference between a maximum value and a minimum value of a* of transmitted light obtained at incident angles of 5°, 20°, 40°, and 60° in an L*a*b* color system for the first resin layer is 3.0 or more and 15.0 or less.