Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1981-03-03
1982-06-15
Smith, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
526154, 526348, 5263482, 5263483, 5263484, 5263485, 5263486, 526351, 526905, C08F 1006
Patent
active
043352251
ABSTRACT:
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 polypropylene 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.degree. C. or is stretched between crossed polarizing sheets at about 25.degree. C. The diethyl ether-soluble fraction itself is a useful elastomeric material.
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Kinsinger et al., Journal of Physical Chemistry, vol. 63, (1959), pp. 2002-2007.
Raff et al., Crystalline Olefin Polymers, Part I, vol. XX, Intersciences Publ., N.Y., (1965), pp. 376, 712-715.
Collette John W.
Tullock Charles W.
E. I. Du Pont de Nemours and Company
Smith Edward J.
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