Radial tire for automobile

• US 20020195185A1
• Filed: 04/05/2002
• Published: 12/26/2002
• Est. Priority Date: 04/11/2001
• Status: Active Grant

• Current Assignee: Hyosung Advanced Materials Corporation (Hyosung Corporation)
• Original Assignee: Hyosung Corporation
• Inventors: Kim, Cheol, Choi, Soo-myung
• Granted Patent: US 6,701,989 B2
• Time in Patent Office: Days
• US Class Current: 152/527
• CPC Class Codes: B60C 2009/0035 Reinforcements made of organic materials, e.g. rayon, cotton or silk
• CPC Class Codes: B60C 9/08 the cords extend transversely from bead to bead, i.e. radial ply B60C9/07 takes precedence
• CPC Class Codes: D02G 3/48 Tyre cords tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606
• CPC Class Codes: Y10T 152/10792 Structure where each bias angle reinforcing cord ply has no opposingly angled ply
• CPC Class Codes: Y10T 428/2965 Cellulosic

Abstract

Disclosed is a radial tire for an automobile, in which lyocell having a dry/wet tenacity ratio S1/S2 of 1.2 to 1.6, a tensile strength at high temperature/a tensile strength at room temperature ratio S3/S4 of more than 0.8, and a shrinkage E of less than 0.01 is applied to a carcass part, thereby a resistance to fatigue and dimensional stability in running of a tire are improved.

Claims

1. A radial tire for an automobile, wherein a lyocell cord is applied to a carcass part, said lyocell cord having a dry tenacity S1 of 4.0 to 5.5 g/d, a wet tenacity S2 of 3.0 to 4.5 g/d, a dry/wet tenacity ratio S1/S2 of 1.2 to 1.6, a tensile strength S3 at high temperatures which is more than 80% of a tensile strength S4 at room temperature, and a shrinkage E of less than 1%.

2. The radial tire for the automobile according to claim 1, wherein said lyocell cord has a total denier of 3000 to 5500 d, the twist number of 10 to 15 tpi, and a reinforcement density of 15 to 30 EPI.

3. A lyocell cord, having a dry tenacity S1 of 4.0 to 5.5 g/d, a wet tenacity S2 of 3.0 to 4.5 g/d, a dry/wet tenacity ratio S1/S2 of 1.2 to 1.6, a tensile strength S3 at high temperatures which is more than 80% of a tensile strength S4 at room temperature, and a shrinkage E of less than 1%.