公开(公告)号：US4923935A

公开(公告)日：1990-05-08

申请号：US302564

申请日：1989-01-26

申请人： Akira Sano ,  Shigeki Yokoyama ,  Yasunosuke Miyazaki ,  Tetsujiro Kuroishi ,  Kazuo Matsuura

发明人： Akira Sano ,  Shigeki Yokoyama ,  Yasunosuke Miyazaki ,  Tetsujiro Kuroishi ,  Kazuo Matsuura

IPC分类号： C08F10/00 ,  C08F2/38 ,  C08F4/00 ,  C08F4/60 ,  C08F4/64 ,  C08F4/654 ,  C08F8/00 ,  C08F10/02

CPC分类号： C08F10/02 ,  C08F10/00

摘要： A process for producing polyethylene of ultrahigh molecular weight having an intrinsic viscosity of 10-30 dl/g at 135.degree. C. in decalin is disclosed which comprises at least the following two stages of polymerization reaction: (a) a first reaction stage where in ethylene is polymerized with use of a catalyst comprising a solid component containing at least Mg, Ti and/or Va and in the absence or presence of hydrogen of reduced concentration to produce 70-99.5 weight parts of polyethylene having an intrinsic viscosity of 12-32 dl/g at 135.degree. C. in decalin; and (b) a second reaction stage wherein a fresh feed of ethylene is polymerized in the presence of hydrogen of higher concentration to produce 30-0.5 weight parts of polyethylene having an intrinsic viscosity of 0.1-5 dl/g at 135.degree. C. in decalin.

摘要翻译： 公开了在135℃下在十氢萘中生产特性粘度为10-30dl / g的超高分子量聚乙烯的方法，其至少包括以下两个阶段的聚合反应：（a）第一反应阶段，其中在 使用包含至少含有Mg，Ti和/或Va的固体组分的催化剂和在还原浓度不存在或不存在的情况下使乙烯聚合，得到70-99.5重量份的特性粘度为12-32的聚乙烯 dl / g，135℃，十氢化萘; 和（b）第二反应阶段，其中乙烯的新鲜进料在较高浓度的氢气存在下聚合，以在135℃下产生特性粘度为0.1-5dl / g的30至0.5重量份的聚乙烯 十氢化萘