W. R. Grace Co.-Conn.

Sharon E Peterson

Mark Williams Blood

Theodore Duncan

The present disclosure provides a process. In an embodiment, the process includes producing a propylene-based polymer in a gas-phase polymerization reactor () under polymerization conditions. The polymerization conditions include a combined propylene-plus-propane partial pressure from 290 psia to 450 psia. The process further includes maintaining the combined propylene-plus-propane partial pressure in the range from 290 psia to 450 psia while simultaneously: (i) reducing propylene partial pressure in the gas-phase polymerization reactor; (ii) adding propane to the gas-phase polymerization reactor; (iii) introducing at least one C4-C10 comonomer into the gas-phase polymerization reactor (); and forming a propylene/C4-C10 interpolymer in the gas-phase polymerization reactor ().

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St. Albans, WV, United States of America

Sharon E Peterson