Syndiotactic polypropylene

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

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526160, C08F 1006

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active

054769140

ABSTRACT:
The invention provides for highly crystalline syndiotactic polypropylene comprising a high percentage of racemic (r) dyads. The high crystallinity may be due to the polymerization mechanism of metallocene catalysts of a particular structure which appear to produce syndiotactic polypropylene of a new microstructure.

REFERENCES:
patent: 3258455 (1986-06-01), Natta et al.
patent: 3268627 (1986-08-01), Emrick
patent: 3305538 (1967-02-01), Natta et al.
patent: 3364190 (1968-01-01), Emrick
patent: 4411821 (1983-10-01), Howard, Jr.
patent: 4497906 (1985-02-01), Hanji et al.
patent: 4522982 (1985-06-01), Ewen
patent: 4530914 (1985-07-01), Ewen et al.
patent: 4542199 (1985-09-01), Kaminsky et al.
patent: 4841009 (1989-06-01), Kaminsky et al.
patent: 4849487 (1989-07-01), Kaminsky et al.
patent: 4892851 (1990-01-01), Ewen et al.
"Stereochemical Aspects on the Secondary Insertion of Propene Monomer into Vanadium-Polymer Bond", Doi et al, Makromol. Chem., vol. 186, No. 12, pp. 2529-2533 (1985).
"Effects of Chain Defects on the Morphology and Thermal Behavior of Solution-Grown Single Crystals of Syndiotactic Polypropylene", Marchetti et al, J. of Polym. Sci., Polym. Phys. Ed., vol. 12, No. 8, pp. 1649-1666 (1974).
"Correlation Between Regio-and Syndiotactic Specificity of Soluble Vanadium-Based Catalysts for Propene Polymerization", Doi, Macromolecules, vol. 12, No. 5, pp. 1012-1013 (1979).
"Polymerization of Propylene to Syndiotactic Polymer", Zambelli et al, Macromolecules, vol. 7, No. 6, pp. 750-751 (1974).
"Crystal Structure and Morphology of Syndiotactic Polypropylene Single Crystals" Lotz et al Macromolecules, vol. 21, No. 8, pp. 2375-2382 (1988).
"Sequence Distributions of Inverted Propylene Units in Polypropylenes Measured by Carbon--NMR", Doi Macromolecules, vol. 12, No. 2, pp. 248-251 (1979).
John A. Ewen, "Mechanisms of Stereochemical Control in Propylene Polymerizations with Soluble Group 4B Metallocene/Methylalumoxane Catalysts" Mar. 12, 1984, pp. 6355-6364.
John A. Ewen, "Ligand Effects on Metallocene Catalyzed Ziegler-Natta Polymerizations", published by Elsevier Publishing Co. Apr. 26, 1986, pp. 271-292.

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