| http://www.w3.org/ns/prov#value | - For example, after adding at least one of the component (A) and component (B), together with above mentioned (C) if necessary, and with a carrier, olefin such as ethylene is introduced at atmospheric pressure to 2 MPa (gauge) and pre-polymerization is conducted at ???20 to 200??? C. for 1 minute to 2 hours to grow catalyst particles.
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