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US 7,608,327 B2Granted
High tear strength film
AssigneeEquistar Chemicals, LP
InventorHarilaos Mavridis
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Abstract
A thick film produced from a polyolefin blend is disclosed. The film is prepared from a blend having a density from 0.935 to 0.955 g/cm3 and comprising LLDPE and greater than 50% by weight HDPE having a density greater than 0.955 g/cm3. The film has a modulus in the machine direction from about 75,000 to about 130,000 psi and improved machine direction tear strength.
Claims8
A film produced from a polyolefin blend that has a density from 0.935 to 0.955 g/cm3, said blend comprising:
- (a) greater than 50 wt. % of HDPE having a density greater than 0.955 g/cm3 and an MI2 less than 1.0 dg/min.;
- and
- (b) LLDPE having a density from 0.900 to 0.925 g/cm3 and an MI2 less than 5.0 dg/min.;
- wherein the film has a thickness from 50 to 200 microns, a modulus in the machine direction (modMD) from about 75,000 to about 130,000 psi, a tear strength in the transverse direction (TSTD) greater than in the machine direction (TSMD), and a TSMD expressed in grams and measured at a film thickness of 100 microns, defined by:
- TSMD>1544−(11.2)(modMD/1000 psi).
2 more elements
A film produced from a polyolefin blend that has a density from 0.935 to 0.955 g/cm3, said blend comprising:
- (a) greater than 50 wt. % of HDPE having a density greater than 0.955 g/cm3 and an MI2 less than 1.0 dg/min.;
- and
- (b) LLDPE having a density from 0.900 to 0.925 g/cm3 and an MI2 less than 5.0 dg/min.;
- wherein the film has a thickness from 50 to 200 microns, and a tear strength in the machine direction (TSMD) greater by at least 20% than that of a film with the same modulus prepared from a single polyethylene resin.
1 more element
Dependencies are inferred from the claim text.