INTERLAYER FOR LAMINATED GLASS AND LAMINATED GLASS
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United States of America Patent
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Mar 31, 2016
filing date -
Mar 31, 2015
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Abstract
There is provided an interlayer film for laminated glass with which an interlayer film portion is less liable to protrude at the time of producing laminated glass. In the interlayer film for laminated glass according to the present invention, when, in the MD direction of the interlayer film, a birefringence index of the first surface part, a birefringence index of the second surface part, and a birefringence index of the center part are defined as ΔnMDA, ΔnMDB, and ΔnMDC, respectively, in the TD direction of the interlayer film, a birefringence index of the first surface part, a birefringence index of the second surface part, and a birefringence index of the center part are defined as ΔnTDA, ΔnTDB, and ΔnTDC, respectively, a higher absolute value among the absolute value of the difference between ΔnMDA and ΔnMDC and the absolute value of the difference between ΔnMDB and ΔnMDC is defined as ΔnMDMAX, and a higher absolute value among the absolute value of the difference between ΔnTDA and ΔnTDC and the absolute value of the difference between ΔnTDB and ΔnTDC is defined as ΔnTDMAX, the total of ΔnMDMAX and ΔnTDMAX is 0.070×10−3 or less.
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