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US 4,057,600 AGranted
Process for producing block copolymers
AssigneeIdemitsu Kosan Co., Ltd.
InventorsAkio Kimura, Kenji Seki, Mamoru Ukita, Satoshi Asahi, Sanae Tagami
Life of this patent
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Abstract
Block copolymers are produced by (i) polymerizing ethylene or propylene, or copolymerizing the same with another .alpha.-olefin of 2 to 7 carbon atoms in the presence of a Ziegler-type catalyst, and (ii) copolymerizing the resulting polymer or copolymer with a radical-polymerizable vinyl compound (e.g., methyl methacrylate) in the presence of an organic sulfoxide.
Claims19
A process for producing a block copolymer which comprises
- i. polymerizing ethylene or propylene or copolymerizing ethylene or propylene with another .alpha.-olefin having from 2 to 7 carbon atoms in the presence of a Ziegler-type catalyst comprising (a) an organic metal compound or a hydrogenated compound thereof wherein the metal is selected from groups I to III of the Periodic Table and (b) a transition metal compound of a metal selected from groups IV to VI of the Periodic Table, and
- ii. copolymerizing the resultant polymer or copolymer with a radical-polymerizable vinyl compound in the presence of an organic sulfoxide.
Dependencies are inferred from the claim text.