Ethylene-aromatic vinyl compound copolymer and method for its production
US5883213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1997 |
| Grant date | Mar 16, 1999 |
| Priority date | — |
| Expiry date | Mar 19, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An ethylene-styrene copolymer having a weight average molecular weight of at least 81,000, having a styrene content of from 1 to less than 55% by molar fraction, wherein the stereoregularity of phenyl groups int he alternating structure of ethylene and styrene 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 .lambda. represented by the following formula (i) is smaller than 70 and larger than 1: EQU .lambda.=A3/A2.times.100 (i) where A3 is the sum of areas of three peaks a, b and c attributable to an ethylene-styrene 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, ##STR1## where Ph is a phenyl group, and xa is an integer of at least 2 representing the number of repeating units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.