DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Ethylene/.
alpha.
-Olefin Copolymer (A) In the ethylene/.
alpha.
-olefin copolymer (A) used in the present invention, the .
alpha.
-olefin to be copolymerized with ethylene is one having 3 to 12 carbon atoms.
Examples are propylene, butene-1, 4-methylpentene-1, hexene-1, octene-1, decene-1 and dodecene-1.
Particularly preferred are propylene, butene-1, 4-methylpentene-1 and hexene-1 which having 3 to 6 carbon atoms.
Further, dienes such as, for example, butadiene and 1,4-hexadiene may be used as comonomers.
It is preferable that the .
alpha.
-olefin content in the ethylene/.
alpha.
-olefin copolymer be in the range of 5 to 40 mol %.
The following description is provided about how to prepare the ethylene/.
alpha.
-olefin copolymer (A) used in the present invention.
The catalyst system used comprises a solid catalyst component and an organoaluminum compound, the solid catalyst component containing at least magnesium and titanium.
For example, the solid catalyst component is obtained by supporting a titanium compound on an inorganic solid compound containing magnesium by a known method.
Examples of magnesium-containing inorganic solid compounds include, in addition to metal magnesium, magnesium hydroxide, magnesium carbonate, magnesium oxide, magnesium chloride, as well as double salts, double oxides, carbonates, chlorides and hydroxides, which contain magnesium atom and a metal selected from silicon, aluminum and calcium, further, these inorganic solid compounds after treatment or reaction with oxygen-containing compounds, sulfur-containing compounds, aromatic hydrocarbons or halogen-containing substances.
As examples of the above oxygen-containing compounds are mentioned organic oxygen-containing compounds such as water, alcohols, phenols, ketones, aldehydes, carboxylic acids, esters, polysiloxanes and acid amides, as well as inorganic oxygen-containing compounds such as metal alkoxides and metal oxychlorides.
As examples of the above sulfur-containing compounds are mentioned organic sulfur-containing compounds such as thiols, thio-esters and the like, inorganic sulfur-containing compounds such as sulfur dioxide, sulfur trioxide, sulfuric acid and the like
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