Nova Chemicals (International) S.a.

Nova Chemicals Inc.

Peter Andrew Sipos

Christopher John Brooke Dobbin

James Arthur Auger

John Leonard Bayley

Lawrence Thomas Kale

Nakul Ulhas Ranade

Patrick R Thomas

James Chin-Kuang Huang

Tracy Leanne Li

Marek Jon Crawford

Ghislaine C Bailey

Jamie A Neilsen

A plastic film having a desirable balance of physical properties is prepared using a pseudohomogeneous linear low density polyethylene (lldpe) resin on a blown film extrusion line. The lldpe used in this invention must have a melt index, I , of from 0.4 to 0.8 grams per 10 minutes, a base resin density of from 0.915 to 0.919 grams per cubic centimeter and a copolymer/homopolymer (COHO) ratio of from 3 to 9. The film must be prepared under specific extrusion conditions using a specific annular extrusion die. The film of this invention has a dart impact strength of greater than 600 grams per mil and a machine direction tear strength of greater than 350 grams per mil and is suitable for the preparation of packaging and trash bags.

Plastic films

Shrink films having an outstanding balance of physical properties and shrink properties are manufactured from &ldquo;pseudohomogeneous&rdquo; linear low density polyethylene resin. The preferred pseudohomogeneous resins used in the present invention are prepared with an advanced Ziegler Natta catalyst (having a magnesium component and a titanium component), preferably in medium pressure solution polymerization process. The films of this invention may be employed in a variety of uses, including, 1) &ldquo;overwrap&rdquo; packaging to protect goods during transportation, distribution, handling and display; and 2) food packaging, such as shrink wrap for frozen poultry, primal meat cuts and processed meat and cheese products.

Shrink films

Growing community of inventors

Calgary, Canada

Peter Andrew Sipos