Thermoplastic elastomer blends of hydrogenated polybutadiene block copolymers with alpha-olefin polymers and copolymers and process for making these blends
申请人:THE FIRESTONE TIRE & RUBBER COMPANY
公开号:EP0026292A1
公开(公告)日:1981-04-08
Thermoplastic elastomer blends of alphaolefin polymers and copolymers, such as polypropylene, having a melting point of at least 90°C with hydrogenated diblock copolymers of 1,4-polybutadiene and 1,2-polybutadiene have good physical properties such as low brittle point, good impact resistance at low temperatures, minimum creep at high temperatures, good elongation, good tensile and tear strengths and good impact strength. The blends can be repeatedly processed and still maintain good physical properties. The amount of alpha-olefin polymer or copolymer in the blend may range from about 10 percent to 60 percent, preferably 15 percent to about 48 percent with the amount of the hydrogenated butadiene block copolymer correspondingly ranging from about 90 percent to about 40 percent, preferably 85 percent to about 52 percent based on the combined weight of the two components. The blends are mixed at temperatures at least as high as the melting point of the alpha-olefin polymer or copolymer.
熔点至少为 90°C 的α-烯烃聚合物和共聚物(如聚丙烯)与 1,4-聚丁二烯和 1,2-聚丁二烯的氢化二嵌段共聚物的热塑性弹性体混合物具有良好的物理性能,如脆点低、低温下抗冲击性好、高温下蠕变最小、伸长率好、拉伸和撕裂强度好以及冲击强度好。混合物可以反复加工,但仍能保持良好的物理性能。共混物中α-烯烃聚合物或共聚物的含量范围为 10%至 60%,最好为 15%至 48%,氢化丁二烯嵌段共聚物的含量范围相应为 90%至 40%,最好为 85%至 52%,以两种组分的总重量为基准。混合物的混合温度至少要达到α-烯烃聚合物或共聚物的熔点。