| 摘要 |
Polypropylene articles of high impact resistance at low temperatures and of improved tensile properties which permit their use at substantially higher tensile loads than conventionally produced articles of polypropylene, are produced by deforming the polypropylene in the solid state under compressive stress. A form of polypropylene is disclosed which is characterized by absence of inhomogeneous deformation under tension, absence of whitening under tension until strained beyond 150 percent deformation, ductility at temperatures of 0 DEG C and below, and an apparent glass transition temperature, determined by torsional damping at 1 cycle per second, of about 15 DEG C.
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