申请人:THE GOODYEAR TIRE & RUBBER COMPANY
公开号:EP0475221A1
公开(公告)日:1992-03-18
Pure syndiotactic 1,2-polybutadiene is a thermoplastic resin which has double bonds attached in an alternating fashion to its polymeric backbone. Films, fibers and molded articles can be made utilizing syndiotactic 1,2-polybutadiene. It can also be blended into rubbers and cocured therewith. Syndiotactic 1,2-polybutadiene can be made by solution, emulsion or suspension polymerization. It typically has a melting point which is within the range of about 195°C to about 215°C. However, it is often desirable for the syndiotactic 1,2-polybutadiene to have a melting point of less than about 195°C. This invention discloses a process for preparing syndiotactic 1,2-polybutadiene having a melting point of less than about 195°C which comprises: polymerizing 1,3-butadiene monomer in an aqueous medium in the presence of (1) a catalyst composition which is made by reacting (a) at least one cobalt compound (b) at least one organoaluminum compound, and (c) at least one conjugated diene; (2) carbon disulfide; and (3) at least one modifier selected from the group consisting of (a) 4-(alkylamino)-benzaldehydes, (b) 4-(dialkylamino)benzaldehydes, (c) 2,4-di-(alkoxy)benzaldehydes, (d) 2,6-di-(alkoxy)-benzaldehydes, (e) 2,4,6-tri-(alkoxy)benzaldehydes, and (f) 4-(1-azacycloalkyl)benzaldehydes.
纯对位 1,2-聚丁二烯是一种热塑性树脂,其聚合物骨架以交替方式连接双键。利用辛二聚丁二烯可以制成薄膜、纤维和模塑制品。它还可以与橡胶混合并与之共混。1,2-聚丁二烯可以通过溶液聚合、乳液聚合或悬浮聚合制成。其熔点通常在约 195°C 至约 215°C 之间。然而,通常希望辛二聚丁二烯的熔点低于约 195°C。本发明公开了一种制备熔点低于约 195°C 的辛二聚 1,2-聚丁二烯的工艺,该工艺包括: 1:在水介质中聚合 1,3-丁二烯单体,聚合时存在 (1) 催化剂组合物,该催化剂组合物由 (a) 至少一种钴化合物 (b) 至少一种有机铝化合物和 (c) 至少一种共轭二烯反应而成;(2) 二硫化碳;(3) 至少一种改性剂,该改性剂选自以下组别:(a) 4-(烷基氨基)-苯甲醛;(b) 4-(二烷基氨基)苯甲醛;(c) 2,4-二(烷氧基)苯甲醛;(d) 2,6-二(烷氧基)-苯甲醛;(e) 2,4,6-三(烷氧基)苯甲醛;(f) 4-(1-氮杂环烷基)苯甲醛。