Pneumatic radial tires with improved alcohol belt cords.Pneumatic radial tires with improved alcohol belt cords U.S. patent: 5,016,698 Issued: May 21, 1991 Inventors: S. Iwasaki and N. Inada Assigned: Bridgestone Corp. 1. a pneumatic radial tire comprising at least two belt reinforcing layers, at least one of which layers being a belt reinforcing layer composed of high modulus polyvinyl alcohol polyvinyl alcohol, n a complex alcohol that is soluble in water and is used as an emulsifier and adhe-sive. fiber (PVA PVA polyvinyl alcohol. ) cords or PVA fiber cords embedded Inserted into. See embedded system. in rubber, characterized in that a cord tenacity S (kg) and a cord elongation elongation, in astronomy, the angular distance between two points in the sky as measured from a third point. The elongation of a planet is usually measured as the angular distance from the sun to the planet as measured from the earth. at break U (%) of said PVA fiber cord taken out from said belt reinforcing layer and an end count T per 5 cm of said belt reinforcing layer at a crown center portion satisfy the following relationship: 12 (S X T) + 1,000 U > 28,000 (1), and a cord diameter L (mm) of said PVA fiber cord and said end count T per 5 cm satisfy the following relationship: [Graph Omitted] (L X T) / 50 X 100 < 80 (2), and a dynamic modulus Dynamic modulus is the ratio of stress to strain under vibratory conditions (calculated from data obtained from either free or forced vibration tests, in shear, compression, or elongation). It is a property of viscoelasticity materials. of elasticity E' at 100 [degrees] C and 30 Hz of said PVA fiber cord taken out from said belt reinforcing layer satisfies the following relationship: 0.7 x [10.sup.11] dyn / [cm.sup.2] < E' < 2.0 x [10.sup.11] dyn/ [cm.sup.2] |
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