发明名称 |
POLYPROPYLENE BLOCK COPOLYMER AND FILM THEREFROM |
摘要 |
PURPOSE:To provide a copolymer for films which cause no fish-eye etc., have good appearance and are excellent in both impact and blocking resistance at low temperatures. CONSTITUTION:The block copolymer can be obtained by 1st stage polymerization for the polymer portion (A-component) consisting mainly of propylene using a Ziegler-Natta catalyst in the virtually absence of inert solvent to an extent of 60-80wt.% of the overall polymerization followed by 2nd stage polymerization for the ethylene-propylene copolymer portion (B-component) 20-50wt.% in ethylene content in a vapor phase to an extent of 20-40wt.% of the overall polymerization. The intrinsic viscosity of the B-component ([eta]B) is >=2.0dl/g and the ratio of the intrinsic viscosity of the B-component to that of the A- component ([eta]B/[eta]A) is <=1.8. The other objective film can be obtained by melt blending of the above block copolymer followed by extrusion. |
申请公布号 |
JPH0693061(A) |
申请公布日期 |
1994.04.05 |
申请号 |
JP19920246159 |
申请日期 |
1992.09.16 |
申请人 |
SUMITOMO CHEM CO LTD |
发明人 |
SADATOSHI HAJIME;KON SEIICHIRO;WAKAMATSU WAKE;MORI JIRO;SHIRATANI EISUKE |
分类号 |
B29C47/00;B29K23/00;C08F297/08;C08J5/18;(IPC1-7):C08F297/08 |
主分类号 |
B29C47/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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