Process for producing a polymer composition

A process for increasing the clarity of blown film from a narrow molecular weight distribution base polymer, said process comprising incorporating with said base polymer a high molecular weight polymer component to produce said polymer composition;

• wherein said base polymer is an ethylene polymer having a Mw/Mn less than about 5 and a melt flow index from about 0.2 g/10 min to about 20 g/10 min;
• and
• wherein said high molecular weight polymer component has a molecular weight distribution such that at least a substantial portion of its molecules have a molecular weight of greater than one million, said high molecular weight polymer component being incorporated in an amount to give about 0.1 to about 10% by weight, based on the total weight of said polymer composition, of said molecules having a molecular weight greater than one million.

A process for increasing the bulk density of a narrow molecular weight distribution base polymer, said process comprising incorporating with said base polymer a high molecular weight polymer component to produce said polymer composition;

• wherein said base polymer is an ethylene polymer having a Mw/Mn less than about 5 and a melt flow index from about 0.2 g/10 min to about 20 g/10 min;
• wherein said high molecular weight polymer component has a molecular weight distribution such that at least a substantial portion of its molecules have a molecular weight of greater than one million, said high molecular weight polymer component being incorporated in an amount to give about 0.1 to about 10% by weight, based on the total weight of said polymer composition, of said molecules having a molecular weight greater than one million;
• wherein said incorporating of said high molecular weight polymer component and said base polymer occurs in a polymerization zone by modifying a polymerization catalyst system before or after said polymerization catalyst system is added to said polymerization zone.

A polymer composition comprising a narrow molecular weight distribution base polymer and a high molecular weight polymer component;

• wherein said base polymer is an ethylene polymer having a Mw/Mn less than about 5 and a melt flow index from about 0.2 g/10 min to about 20 g/10 min;
• wherein said high molecular weight polymer component has a molecular weight distribution such that at least a substantial portion of its molecules have a molecular weight of greater than one million, said component being incorporated in an amount to give about 0.1 to about 10% by weight, based on the total weight of said polymer composition, of said molecules having a molecular weight greater than one million.