Elastomeric polypropylene

Details Elastomeric polypropylene Elastomeric polypropylene

C - Chemistry, Metallurgy

08

F

402/624, 402/640

C08F 10/06 (2006.01) C08F 110/06 (2006.01) C08L 23/12 (2006.01)

Patent

CA 1105647

ABSTRACT OF THE DISCLOSURE A fractionable elastic polypropylene which has an inherent viscosity of 1.5-9, exhibits no yield point, has a tensile set not exceeding 150% and contains about 10 to 80% by weight of a diethyl ether-soluble fraction having an inherent viscosity exceeding 1.50. This poly- propylene is a direct reaction product and thus need not be separated into its component parts to be a useful elastomer. Also described is the diethyl ether-soluble polypropylene fraction of the direct reaction product which has about 0.5% to about 5% isotactic crystallinity and exhibits birefringence when a film formed from said fraction is viewed under crossed Nicol prisms in a polarizing microscope at about 25°C or is stretched between crossed polarizing sheets at about 25°C. The diethyl ether-soluble fraction itself is a useful elas- tomeric material.

307087

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