发明授权
- 专利标题: Process for making high stereoregular polypropylenes
- 专利标题(中): 制备高立体规则聚丙烯的方法
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申请号: US858498申请日: 1997-05-19
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公开(公告)号: US6096843A公开(公告)日: 2000-08-01
- 发明人: Jun Saito , Naoshi Kawamoto , Akiko Kageyama , Yoshiyuki Oogi , Kouichi Hatada
- 申请人: Jun Saito , Naoshi Kawamoto , Akiko Kageyama , Yoshiyuki Oogi , Kouichi Hatada
- 申请人地址: JPX Osaka
- 专利权人: Chisso Corporation
- 当前专利权人: Chisso Corporation
- 当前专利权人地址: JPX Osaka
- 优先权: JPX7-136425 19950602
- 主分类号: C08F4/642
- IPC分类号: C08F4/642 ; C08F4/44 ; C08F4/60 ; C08F4/659 ; C08F4/6592 ; C08F8/00 ; C08F10/06 ; C08F110/06
摘要:
A process for the production of a high stereoregular polypropylene wherein(a) an isotactic pentad (m m m m) is 0.950 to 0.995,(b) a syndiotactic pentad (r r r r) is 0 to 0.01,(c) a different bond due to 2,1- and 1,3-insertions of propylene monomer is 0 to 0.3 mol %,(d) an absence of a terminal double bond is confirmed,(e) a weight average molecular weight (Mw) is 50,000 to 1,000,000 and(f) a ratio (Mw/Mn) of the weight average molecular weight (Mw) to a number average molecular weight (Mn) is 1.5 to 3.8, (a) to (d) being determined from .sup.13 C NMR spectra, comprising polymerizing propylene in the presence of hydrogen using a catalyst comprising a chiral transition metal compound and an aluminoxane, the transition metal compound being represented by the formula of Q(C.sub.5 H.sub.4-m R.sup.1.sub.m) (C.sub.5 H.sub.4-n R.sup.2.sub.n)MXY wherein (C.sub.5 H.sub.4-m R.sup.1.sub.m) and (C.sub.5 H.sub.4-n R.sup.2.sub.n) represent a substituted cyclopentadienyl group; m and n are an integer of 1 to 3; R.sup.1 and R.sup.2 may be the same or different and each represents an alkyl group of 1 to 20 carbons; Q is a group capable of crosslinking (C.sub.5 H.sub.4-m R.sup.1.sub.m) and (C.sub.5 H.sub.4-n R.sup.2.sub.n) and represents a divalent, hydrocarbyl radical, an unsubstituted silylene group or a hydrocarbyl-substituted silylene group; M represents a transition metal selected from the group consisting of titanium, zirconium, and hafnium; X and Y may be the same or different and each represents a hydrogen, a halogen or a hydrocarbyl radical, and wherein said polymerization is performed by a slurry polymerization using an aliphatic hydrocarbon as a solvent or by a bulk polymerization using propylene as a solvent.
公开/授权文献
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