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It is frequently desirable that the propylene polymer exhibit high temperature resistance, especially resistance to cracking and/or reduced tendency toward surface adhesion and embrittlement. In order to overcome these deficiencies, certain additives or ingredients have been introduced into polypropylene polymers. These additives include inorganic substances such as calcium, magnesium, and barium or antistatic agents. Although these agents may improve the mechanical properties of the polymers, other performance properties suffer, and undesirable properties may be introduced into the polymers.
One approach to improving performance properties while maintaining mechanical properties involves the use of propylene-ethylene copolymers in these polypropylene compositions. It has been suggested that the addition of an ethylene copolymer containing long chain branches enhances the heat distortion properties of the propylene resin. This is believed to be due to the advantageous effect of the ethylene polymer on improving the flex crack resistance of the propylene polymer. However, the ethylene copolymer is disadvantageous due to the cost and difficult incorporation process of addition of such copolymers to the polymer. Other attempts to improve the mechanical properties of propylene polymer compositions have involved the addition of vinyl-aromatic monomer to the propylene polymer.
U.S. Pat. No. 4,132,707 discloses a polypropylene polymer composition containing graft polymerized 0b46394aab