Polymer Interlayer Color Compensation
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Solution Overview
Problem
Current polymer interlayers for laminated safety glass often exhibit undesirable yellow color due to manufacturing processes and additives, which affects their optical quality and aesthetic appeal, particularly in applications requiring clear or extra clear glazing.
Innovation Solution
Incorporating specific colorants into poly(vinyl butyral) resin and plasticizer formulations to adjust the a* and b* color coordinates, resulting in interlayers with a yellowness index (YI) of 0<YI<2, achieving a more neutral or crystal-clear appearance without compromising mechanical or optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic compounds and additives are added to the interlayer formulation during manufacturing, then the interlayer gains necessary functional properties, but the interlayer develops undesirable yellow color
Solution Approach 1:
The patent applies color compensation by adding blue colorants (such as ultramarine blue, cobalt blue, or phthalocyanine blue) to counteract the yellow color generated by organic compounds and additives. The blue colorant absorbs yellow light wavelengths and reflects blue wavelengths, creating a visual neutralization effect that masks the yellow discoloration while preserving the functional properties of the interlayer formulation.
Solution Approach 2:
The patent creates a composite interlayer formulation that combines multiple components: the base polymer (polyvinyl butyral), functional additives (plasticizers, stabilizers, adhesion promoters), and color compensating agents (blue pigments or dyes). This composite approach allows the interlayer to maintain all necessary functional properties while the blue colorant compensates for the yellowing effect, achieving a balanced formulation that satisfies both performance and aesthetic requirements.
2Object-generated harmful factors
If stabilizers and optical brighteners are added to reduce yellowness, then the yellow color is partially reduced, but the formulation complexity and manufacturing difficulty increase
Solution Approach 1:
The patent simplifies the approach by changing the color compensation parameter from using multiple functional additives (stabilizers, brighteners) to using a single or limited combination of blue colorants. By adjusting the concentration and type of blue pigment or dye, the formulation achieves yellow color reduction without significantly increasing formulation complexity or manufacturing difficulty. This parameter change approach maintains formulation simplicity while effectively addressing the yellowness issue.
3Object-generated harmful factors
If manufacturing process modifications are made to limit component contributions to yellowness, then yellow color is reduced, but production time and process complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-selecting and pre-mixing blue colorants into the interlayer formulation before the extrusion process. This allows the color compensation to occur during normal manufacturing operations rather than requiring additional post-processing steps or extended manufacturing time. The blue colorant is incorporated in advance, so the yellow color reduction happens automatically during standard production without adding significant time or process complexity.
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 solution effectively reduces the yellowness of polymer interlayers, enhancing their aesthetic appeal and optical quality, making them suitable for applications requiring low color or crystal-clear glazing without sacrificing performance.
Implementation Method 1
Incorporating specific colorants into poly(vinyl butyral) resin and plasticizer formulations to adjust the a* and b* color coordinates, resulting in interlayers with a yellowness index (YI) of 0<YI<2
Data Source
AI summary
Polymer interlayers that have low color for multiple layer panels are disclosed. The use of polymer interlayers having low color provide multiple layer panels with low color and lower yellowness index.