Polypropylene resin compositions of high syndiotacticity and pre

Details Polypropylene resin compositions of high syndiotacticity and pre Polypropylene resin compositions of high syndiotacticity and pre

1990-06-06

1993-05-18

Seccuro, Jr., Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525322, 525323, 525268, C08F29708, C08L 2310, C08L 2312, C08L 2316

Patent

active

052122476

ABSTRACT:
Disclosed herein is a polypropylene resin composition of a high syndiotacticity comprising a substantial homopolymer of propylene, in which the ratio of the intensity of the peak attributable to the syndiotactic pentad bonds to the sum of the intensities of all the peaks attributable to the methyl groups in the spectrum of the methyl groups measured by .sup.13 C-NMR is 0.7 or more, and a copolymer of ethylene and propylene, and a preparation process thereof.

REFERENCES:
patent: 3629368 (1971-12-01), Fukuda et al.
patent: 4339557 (1982-07-01), Hasuo et al.
patent: 4491652 (1985-01-01), Matthews et al.
patent: 4576994 (1986-03-01), Dorrer et al.
patent: 4892851 (1990-01-01), Ewen et al.
patent: 4946898 (1990-08-01), Kasahara et al.
Evens et al.--Michigan Mol. Institute--1981 MMI International Symposium on Transition Metal Polym. pp. 245-263.
Exxon--Elastomers For Polyolefin Modification--1975 pp. 1-4 & 31-35.
J. Am. Chem. Soc., 1988, 110, pp. 6255-6256.

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