申请人:Bridgestone Corporation
公开号:EP0771836A2
公开(公告)日:1997-05-07
A fiber composite material in which short fibers, such as polyester short fibers, are added to a matrix, such as a cross-linked rubber matrix, is provided, wherein a heat shrinkage ratio of the short fibers is 8% or less at fiber composite material molding temperatures of 140 to 200°C. Also provided is a pneumatic tire in whose tire tread the fiber composite material is used. Such pneumatic tires include pneumatic tires provided with a foamed rubber layer in a fire tread. The foamed rubber layer has an average cell diameter of 10 to 120 µm and an expansion ratio of 3 to 50%. A solid phase rubber portion of the foamed rubber layer includes 5 to 55 parts by weight of carbon black, 55 to 5 parts by weight of silica, and 1 to 15 parts by weight of short fibers to 100 parts by weight of a diene-base rubber component including 70 to 20 parts by weight of natural rubber and 30 to 80 parts by weight of polybutadiene rubber. A surface of the tire tread has a hardness of 52 or less at 0°C. The short fibers have a length which is from 0.5 to 3 mm and which is shorter than a minimum gap between sipes of a tire surface, a diameter of 30 to 100 µm, an aspect ratio of 5 to 100, and a heat shrinkage ratio of 8% or less at 140 to 200°C. On-ice performance of the pneumatic tire of the present invention is excellent.
提供了一种纤维复合材料,其中短纤维(如聚酯短纤维)被添加到基体(如交联橡胶基体)中,在纤维复合材料成型温度为 140 至 200°C 时,短纤维的热收缩率为 8%或更低。还提供了一种充气轮胎,其轮胎胎面使用了纤维复合材料。这种充气轮胎包括在防火花纹中带有发泡橡胶层的充气轮胎。发泡橡胶层的平均孔径为 10 至 120 微米,膨胀率为 3 至 50%。发泡橡胶层的固相橡胶部分包括 5 至 55 份(按重量计)炭黑、55 至 5 份(按重量计)白炭黑、1 至 15 份(按重量计)短纤维和 100 份(按重量计)二烯基橡胶成分(包括 70 至 20 份(按重量计)天然橡胶和 30 至 80 份(按重量计)聚丁二烯橡胶)。轮胎胎面在 0°C 时的硬度为 52 或以下。短纤维的长度为 0.5 至 3 毫米,短于轮胎表面沟槽之间的最小间隙,直径为 30 至 100 微米,长宽比为 5 至 100,在 140 至 200°C 温度条件下的热收缩率为 8%或更低。本发明的充气轮胎的冰上性能极佳。