Alpha-olefin/vinylidene aromatic monomer and/or hindered...

C - Chemistry – Metallurgy – 08 – F

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C08F 210/00 (2006.01) C08F 4/642 (2006.01) C08F 210/02 (2006.01) C08F 212/04 (2006.01) C08F 212/08 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2264894

The present invention relates to .alpha.-olefin/vinyl aromatic monomer interpolymers with characteristic signals in their carbon 13 NMR spectra. In particular, ethylene/styrene copolymers of the present invention have peaks in the carbon 13 NMR spectra which appear in the chemical shift range 43.70 - 44.25 ppm, preferably from 43.75 - 44.25 ppm and 38.0 - 38.5 ppm, said peaks being at least three times the peak to peak noise. The interpolymers are prepared by polymerizing the appropriate mixture of monomers in the presence of a catalyst such as racemic-(dimethylsilanediyl(2-methyl-4-phenylindenyl)) zirconium dichloride. The polymers of the present invention possess increased modulus as determined from both tensile stress/strain and dynamic mechanical data at comparable vinyl aromatic monomer levels.

Nouveaux types de copolymères de monomère aromatique d'alpha-oléfine/vinyle dont les spectres RMN au carbone 13 ont des signaux caractéristiques. En particulier, les copolymères d'éthylène/styrène décrits ont des crêtes dans les spectres considérés, qui apparaissent à l'intérieur du domaine de déplacement chimique compris entre 43,70 et 44,25 mg/l, de préférence entre 43,75 et 44,25 mg/l et entre 38,0 et 38,5 mg/l, ces crêtes équivalant au moins à trois fois le bruit de crête à crête. Les copolymères sont obtenus par polymérisation du mélange approprié de monomères, en présence d'un catalyseur comme le dichlorure de zirconium de (diméthylsilanediyle (2-méthyle-4-phénylindényle)) racémique. Les polymères décrits ont un module accru, du point de vue de la contrainte de traction/déformation due à la traction et des propriétés mécaniques dynamiques, à des niveaux de monomère aromatique de vinyle comparable.

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