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US 7,022,794 B2Granted
Process for producing olefin/aromatic vinyl copolymer
AssigneeDenki Kagaku Kogyo Kabushiki Kaisha
InventorsToru Arai, Toshiaki Otsu, Masataka Nakajima
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AssigneeDenki Kagaku Kogyo Kabushiki Kaisha
InventorsToru Arai, Toshiaki Otsu, Masataka Nakajima
Estimating the term…
An olefin/aromatic vinyl compound copolymer which is excellent in transparency and which satisfies flexibility and heat resistance simultaneously can be produced by carrying out polymerization in such a manner that at least one of conditions: (a) the polymerization is carried out to an aromatic vinyl compound monomer conversion ratio of at least 50 mol % when the polymerization is completed, and (b) the polymer concentration is at least 10 mass % relative to the polymerization solution when the polymerization is completed, is satisfied, and the olefin partial pressure is changed so that the olefin partial pressure when the polymerization is completed is from 1.3 to 20 times the olefin partial pressure at the initiation of the polymerization.
A process for producing an olefin/aromatic vinyl compound copolymer, which comprises carrying out polymerization in such a manner that (1) at least one of conditions (a) polymerization is carried out to an aromatic vinyl compound monomer conversion ratio of at least 50 mol % when the polymerization is completed, and (b) the polymer concentration is at least 10 mass % relative to the polymerization solution when the polymerization is completed, is satisfied, and (2) olefin partial pressure is changed during the polymerization so that the olefin partial pressure when the polymerization is completed is from 1.3 to 20 times the olefin partial pressure at the initiation of the polymerization.
A process for producing an olefin/aromatic vinyl compound copolymer, which comprises carrying out copolymerization in such a manner that conditions such that the aromatic vinyl compound monomer conversion ratio is at least 50 mol % when the polymerization is completed, and that the polymer concentration is at least 10 mass % relative to the polymerization solution when the polymerization is completed, are satisfied, and olefin partial pressure is changed during the polymerization so that the olefin partial pressure when the polymerization is completed is from 1.3 to 20 times the olefin partial pressure at the initiation of the polymerization.
An olefin/aromatic vinyl compound copolymer, wherein the A hardness, and at least one melting point among melting points with a heat of crystal fusion of from 10 J/g to 150 J/g as measured by DSC, satisfy the following relation:
An olefin/aromatic vinyl compound copolymer, wherein the ratio of MFR measured at a measurement temperature of 230° C. at loads of 10 kg and 2 kg (I10/I2) is from 10 to 50.
Dependencies are inferred from the claim text.