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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 fiber (PVA) cords or PVA fiber cords embedded in rubber, characterized in that a cord tenacity S (kg) and a cord elongation 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 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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Title Annotation:Patent News
Author:Samples, Bob
Publication:Rubber World
Article Type:Brief Article
Date:Nov 1, 1991
Words:209
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