The invention provides a process for producing a thermoplastic elastomer, which comprises bringing polymer particles composed of a crystalline olefinic polymer moiety and a noncrystalline polymer moiety, a cross-linking agent and, if necessary, a cross- linking aid and/or a mineral oil softening agent, and a grafting agent into contact with each other at a temperature lower than the melting point of the crystalline olefinic polymer or the glass transition point of the noncrystalline polymer, whichever is higher, to thereby cause cross-linking inside the particles. The invention also provides another process for producing a thermoplastic elastomer, which comprises bringing polymer particles composed of a crystalline olefinic polymer moiety and a non-crystalline polymer moiety, a grafting agent, a radical initiator and, if necessary, a cross-linking aid and a mineral oil softening agent into contact with each other at a temperature lower than the melting point of the crystalline olefinic polymer or the glass transition point of the non-crystalline polymer, whichever is higher, to thereby cause cross-linking and grafting inside the particles.
本发明提供了一种生产热塑性弹性体的工艺,该工艺包括将由结晶烯烃聚合物分子和非结晶聚合物分子组成的聚合物颗粒、
交联剂和(必要时)交联助剂和/或矿物油软化剂以及接枝剂在低于结晶烯烃聚合物熔点或非结晶聚合物
玻璃化转变点(以较高者为准)的温度下相互接触,从而使颗粒内部发生交联。本发明还提供了另一种生产热塑性弹性体的工艺,该工艺包括将由结晶烯烃聚合物分子和非结晶聚合物分子、接枝剂、自由基
引发剂以及必要时的交联助剂和矿物油软化剂组成的聚合物颗粒在低于结晶烯烃聚合物熔点或非结晶聚合物
玻璃化转变点(以较高者为准)的温度下相互接触,从而引起颗粒内部的交联和接枝。