Cross-copolymerized olefin/aromatic vinyl compound/diene copolymer and process for its production
AssigneeDenki Kagaku Kogyo Kabushiki Kaisha
InventorsToru Arai, Toshiaki Otsu, Masataka Nakajima
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Abstract
A highly uniform vinyl compound polymer-cross-copolymerized olefin/styrene/diene copolymer excellent in processability, mechanical properties, high temperature properties, compatibility and transparency, and its composition and a process for its production, are provided. This copolymer is a crossed polymer obtained by cross-copolymerizing an olefin/styrene/diene copolymer having a styrene content of from 0.03 mol % to 96 mol %, a diene content of from 0.0001 mol % to 3 mol % and the rest being an olefin, with an olefin/aromatic vinyl compound copolymer.
Claims23
A cross-copolymerized olefin/aromatic vinyl compound/diene copolymer characterized in that it is obtained by cross-copolymerizing an olefin/aromatic vinyl compound/diene copolymer having an aromatic vinyl compound content of from 0.03 mol % to 96 mol %, a diene content of from 0.0001 mol % to 3 mol % and the rest being an olefin, with an olefin/aromatic vinyl compound copolymer (which may contain a diene) having an aromatic vinyl compound content which is different by at least 5 mol %.
A cross-copolymerized olefin/aromatic vinyl compound/diene copolymer characterized in that it is obtained by using an olefin/aromatic vinyl compound/diene copolymer having an aromatic vinyl compound content of from 0.03 mol % to 96 mol %, a diene content of from 0.0001 mol % to 3 mol % and the rest being an olefin, and cross-copolymerizing it, wherein the aromatic vinyl compound content is different by at least 2 mol % as compared with the olefin/aromatic vinyl compound/diene copolymer prior to the cross-copolymerization.
A process for producing a cross-polymerized olefin/aromatic vinyl compound/diene copolymer, characterized in that the production is carried out by employing a polymerization process of at least two steps comprising, as a first polymerization step (main chain polymerization step), carrying out copolymerization of an aromatic vinyl compound monomer, an olefin monomer and a diene monomer by means of a coordination polymerization catalyst to synthesize an olefin/aromatic vinyl compound/diene copolymer, and then, as a second polymerization step (crossing step) under conditions different therefrom, carrying out polymerization in the coexistence of this olefin/aromatic vinyl compound/diene copolymer and at least an olefin and an aromatic vinyl compound monomer by means of a coordination polymerization catalyst.
An olefin/aromatic vinyl compound/divinylbenzene copolymer having an aromatic vinyl compound content of from 0 mol % to 96 mol%, a diene content of from 0.0001 mol % to 3 mol % and the rest being an olefin, obtained by copolymerizing m-divinylbenzene having an isomer purity of at least 80 weight %, an olefin and an aromatic vinyl compound.
Dependencies are inferred from the claim text.