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US 6,664,358 B2Granted
Highly alternating ethylene styrene interpolymers
AssigneeNOVA Chemicals (International) S.A.
InventorsQinyan Wang, Patrick Lam, Garry Takashi Yamashita
Life of this patent
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Abstract
Novel ethylene styrene interpolymers having atactic ES repeating units and an alternating structure substantially higher than that predicted using Bernoullian statistics may be prepared in the presence of a transition metal phosphinimine compound and an activator.
Claims8
A highly alternating interpolymer consisting of from 20 to 70 weight % of ethylene and from 80 to 30 weight % of a C8-20 vinyl aromatic monomer wherein:
- (i) in the triad sequence of vinyl aromatic monomer and ethylene as determined by 13C NMR, the triads have the sequence vinyl aromatic monomer, ethylene, vinyl aromatic monomer and the ratio of the amount of triads having the sequence vinyl aromatic monomer, ethylene, vinyl aromatic monomer divided by the calculated amount of triads having the same sequence as determined by Bernoullian statistical modeling is from greater than 1.5 to 9.5;
- (ii) said polymer has ethylene vinyl aromatic monomer repeating units essentially in an atactic configuration;
- (iii) the maximum number of sequential vinyl aromatic monomer units in sequence does not exceed 2;
- and
- (iv) said polymer containing ethylene vinyl aromatic monomer repeating unit, having head to tail and tail to tail microstructure present.
2 more elements
Dependencies are inferred from the claim text.