Method for selecting adhesive with excellent folding stability
AssigneeLG Chem, Ltd.
InventorsHyunsup LEE, Hyon Gyu PARK, Yoonkyung KWON, Myunghan LEE, Hee SONG
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Abstract
The present invention relates to a method of deriving significant factors of rheological properties, which influence folding stability for developing an adhesive with excellent folding stability, and predicting folding stability through the same. It is possible to select an adhesive with excellent folding stability by measuring initial stress and a strain recovery rate as the significant factors, and measuring predicted folding stability (predicted number of times of folding) therefrom.
Claims7
A method for selecting an adhesive having excellent folding stability, which comprises measuring an initial stress and a strain recovery of the adhesive by using a dynamic mechanical analyzer (DMA), and then calculating a predictive folding stability value of the adhesive by using Equation 1 below:
- Predictive folding stability=1.587×1019(Strain recovery−4.722)(Initial stress−1.304). [Equation 1]
A foldable display comprising an adhesive, wherein the adhesive has a predictive folding stability value that is greater than or equal to 40000, wherein the predictive folding stability value is calculated based on measuring an initial stress and a strain recovery of the adhesive by using a dynamic mechanical analyzer (DMA), and then calculating the predictive folding stability value (predictive folding number) of the adhesive by using Equation 1 below:
- Predictive folding stability=1.587×1019(Strain recovery−4.722)(Initial stress−1.304). [Equation 1]
Dependencies are inferred from the claim text.