The present invention relates to comb block copolymers, combining an elastomeric backbone and rigid pendent blocks and thus having thermoplastic elastomer properties. The invention targets in particular comb block copolymers which may be used as a material as is.
According to the invention, the comb block copolymer is a diene/polypropylene thermoplastic elastomer copolymer, characterized in that it consists of a backbone, said backbone being derived from a diene elastomer, and in that it comprises from 5% to 50% by weight, relative to the total weight of the copolymer, of pendent semicrystalline polypropylene groups distributed along the backbone.
Another subject of the invention is the process for preparing same, and the compositions comprising same.
Finally, a subject of the invention is a tire, one of the constituent elements of which comprises such a composition.
本发明涉及组合嵌段共聚物,该共聚物结合了弹性骨架和刚性下垂嵌段,因此具有热塑性弹性体特性。本发明尤其针对可用作原材料的梳状嵌段共聚物。
根据本发明,梳状嵌段共聚物是一种二烯/聚
丙烯热塑性弹性体共聚物,其特征在于它由一根骨架组成,所述骨架来自二烯弹性体,而且相对于共聚物的总重量,它包括 5%至 50%(按重量计)沿骨架分布的下垂半结晶聚
丙烯基团。
本发明的另一个主题是制备该共聚物的工艺以及包含该共聚物的组合物。
最后,本发明的一个主题是轮胎,其组成元素之一包括这种组合物。