Ethylene-aromatic vinyl compound copolymer and method for its production
AssigneeDenki Kagaku Kogyo Kabushiki Kaisha
InventorsToru Arai, Akihiko Nakamura, Shigeru Suzuki, Toshiaki Otsu, Akio Okamoto
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Abstract
The present invention provides an ethylene-aromatic vinyl compound copolymer having an aromatic vinyl compound content of from 1 to less than 55% by molar fraction, and otherwise defined in the claims, and compositions and molded products containing same.
Claims44
An ethylene-aromatic vinyl compound copolymer having an aromatic vinyl compound content of from 1 to less than 55% by molar fraction, which has a haze of at most 41.5% when molded;
- wherein the stereoregularity of the aromatic vinyl compound groups in the alternating structure of ethylene and an aromatic vinyl compound represented by the following formula (1) contained in its structure, is represented by an isotactic diad index m of more than 0.75, and the alternating structure index λ represented by the following formula (i) is smaller than 70 and larger than 1:
- λ=A3/A2×100 (i)
- where A3 is the sum of areas of three peaks a, b and c attributable to an ethylene-aromatic vinyl compound alternating structure represented by the following formula (1′), obtained by 13C-NMR, and A2 is the sum of areas of peaks attributable to the main chain methylene and methine carbon, as observed within a range of from 0 to 50 ppm by 13C-NMR using TMS as standard,
- where Ph is an aromatic group, and xa is an integer of at least 2 representing the number of repeating units,
- wherein Ph is an aromatic group, and xa is an integer of at least 2 representing the number of repeating units.
An ethylene-aromatic vinyl compound copolymer having an aromatic vinyl compound content of from 1 to less than 55% by molar fraction, which has a haze of at most 41.5% when molded, which comprises a structure represented by the following formula (2) as the main structure, wherein the index θ represented by the following formula (ii), is larger than 70 when the aromatic vinyl compound content is smaller than 45% by molar fraction, or larger than 50 when the aromatic vinyl compound content is at least 45% by molar fraction:
- θ=A1/A2×100 (ii)
- wherein A1 is the sum of areas of peaks attributable to methine and methylene carbon α to ε in the following formula (2′) as observed within a range of from 0 to 50 ppm by 13C-NMR using TMS as standard, and A2 is the sum of areas of peaks attributable to the main chain methylene and methine carbon, as observed within a range of from 0 to 50 ppm by 13C-NMR using TMS as standard:
- where Ph is an aromatic group, xb is an integer of at least 2 representing the number of repeating units, y is an integer of at least 1, which may be the same or different among the respective repeating units, and z is 0 or 1, which may be the same or different among the respective repeating units,
- where Ph is an aromatic group, xb is an integer of at least 2 representing the number of repeating units, y is an integer of at least 1, which may be the same or different from the respective repeating units, and z is 0 or 1, which may be the same or different among the respective repeating units.
A composition obtained by blending a plurality of copolymers having different aromatic vinyl compound contents, wherein the copolymers are selected from the group consisting of ethylene-aromatic vinyl compound copolymers having an aromatic vinyl compound content of from 1 to less than 55% by molar fraction, which has a haze of at most 41.5% when molded;
- wherein the stereoregularity of the aromatic vinyl compound groups in the alternating structure of ethylene and an aromatic vinyl compound represented by the following formula (1) contained in its structure, is represented by an isotactic diad index m of more than 0.75, and the alternating structure index λ represented by the following formula (i) is smaller than 70 and larger than 1:
- λ=A3/A2×100 (i)
- where A3 is the sum of areas of three peaks a, b and c attributable to an ethylene-aromatic vinyl compound alternating structure represented by the following formula (1′), obtained by 13C-NMR, and A2 is the sum of areas of peaks attributable to the main chain methylene and methine carbon, as observed within a range of from 0 to 50 ppm by 13C-NMR using TMS as standard,
- where Ph is an aromatic group, and xa is an integer of at least 2 representing the number of repeating units,
- wherein Ph is an aromatic group, and xa is an integer of at least 2 representing the number of repeating units.
An ethylene-aromatic vinyl compound copolymer having an aromatic vinyl compound content of from 1 to less than 55% by molar fraction, wherein the stereoregularity of Ph groups in the alternating structure of ethylene and an aromatic vinyl compound represented by the following formula (1′) contained in its structure, is represented by an isotactic diad index m of more than 0.75, and the alternating structure index λ represented by the following formula (i) is smaller than 70 and larger than 1:
- λ=A3/A2×100 (i)
- where A3 is the sum of areas of three peaks a, b and c attributable to an ethylene-aromatic vinyl compound alternating structure represented by the following formula (1′), obtained by 13C-NMR, and A2 is the sum of areas of peaks attributable to the main chain methylene and methine carbon, as observed within a range of from 0 to 50 ppm by 13C-NMR using TMS as standard,
- where Ph is an aromatic group selected from the group consisting of phenyl, p-methyl-substituted phenyl, m-methyl-substituted phenyl, o-methyl-substituted phenyl, o-t-butyl-substituted phenyl, m-t-butyl-substituted phenyl, p-t-butyl-substituted phenyl, p-chloro-substituted phenyl, o-chloro-substituted phenyl, and vinyl-substituted phenyl, and xa is an integer of at least 2 representing the number of repeating units.
An ethylene-aromatic vinyl compound copolymer having, an aromatic vinyl compound content of from 1 to less than 55% by molar fraction, wherein the stereoregularity of Ph groups in the alternating structure of ethylene and an aromatic vinyl compound represented by the following formula (1″) contained in its structure, is represented by an isotactic diad index m of more than 0.75, and the alternating structure index λ represented by the following formula (i) is smaller than 70 and larger than 1:
- λ=A3/A2×100 (i)
- where A3 is the sum of areas of three peaks a, b and c attributable to an ethylene-aromatic vinyl compound alternating structure represented by the following formula (1″), obtained by 13C-NMR, and A2 is the sum of areas of peaks attributable to the main chain methylene and methine carbon, as observed within a range of from 0 to 50 ppm by 13C-NMR using TMS as standard,
- where Ph is a phenyl group, and xa is an integer of at least 2 representing the number of repeating units.
Dependencies are inferred from the claim text.