Described is a modified cis-1,4-polyisoprene rubber on the basis of a solid synthetic cis-1,4-polyisoprene containing in its molecule per 100 repeating isoprene units at least 0.01 mole of a succinimide derivative of the general formula I
wherein R1 is hydrogen or a covalent bond with the rubber molecule, R2 is a hydrocarbon residue having not more than 20 carbon atoms, and optionally containing an oxygen or sulfur atom in its principal chain, and A is a dihydrocarbylamino residue having not more than 20 carbon atoms, and containing at least one tertiary nitrogen atom as a hetero atom. This modified rubber exhibits excellent green strength at room temperature and flowability at elevated temperatures. In its vulcanized form it is comparable to, or better than vulcanized natural rubber in tensile strength and hardness.
所述改性顺式-1,4-聚
异戊二烯橡胶以固体合成顺式-1,4-聚
异戊二烯为基础,其分子中每 100 个重复
异戊二烯单元至少含有 0.01 摩尔通式 I 的琥珀
酰亚胺衍
生物。
其中 R1 是氢或与橡胶分子之间的共价键;R2 是碳原子数不超过 20 个的烃残基,其主链中可选择含有一个氧原子或
硫原子;A 是碳原子数不超过 20 个的二氢羰基
氨基残基,其杂质原子中至少含有一个叔氮原子。这种改性橡胶在室温下具有优异的生坯强度,在高温下具有良好的流动性。在
硫化状态下,其拉伸强度和硬度与
硫化
天然橡胶相当,甚至更好。