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US 2014/0179873 A1Published application
Polyethylene blend compositions and film
AssigneeNOVA Chemicals (International) S.A.
InventorsPatrick Lam, Victoria Ker, Karen Grabow
Life of this patent
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Abstract
A polymer blend comprising first and second polyethylene copolymers is presented which has good processability, and which when made into film shows good toughness-stiffness balance, reasonable MD tear, as well as good optical properties.
Claims29
A polymer blend comprising:
- from about 5 to about 95 wt % of a first polyethylene copolymer having a density of from about 0.916 to about 0.936 g/cm3, a melt index (I2) of from about 0.1 to about 2.0 g/10 min, a melt flow ratio (I21/I2) of from about 32 to about 50, a molecular weight distribution (Mw/Mn) of from about 3.6 to about 6.5, a reverse comonomer distribution profile as determined by GPC-FTIR, a multimodal TREF profile, a composition distribution breadth index CDBI50 of from about 45 wt % to about 75 wt % as determined by TREF and which further satisfies the relationship:
- (Mw/Mn)≧72 [(I21/I2)−1+10−6 (Mn)];
- and
- b) from about 95 to about 5 wt % of a second polyethylene copolymer which is a linear low density polyethylene (LLDPE) different from the first polyethylene copolymer and having a density of from about 0.910 to about 0.940 g/cm3, a melt index (I2) of from about 0.2 to about 5.0 g/10 min, and a melt flow ratio (I21/I2) of less than about 35.
1 more element
A polymer blend comprising:
- from about 5 to about 95 wt % of a first polyethylene copolymer having a density of from about 0.916 to about 0.936 g/cm3, a melt index (I2) of from about 0.1 to about 1.0 g/10 min, a melt flow ratio (I21/I2) of from about 32 to about 50, a molecular weight distribution (Mw/Mn) of from about 3.6 to about 6.5, a reverse comonomer distribution profile as determined by GPC-FTIR, a multimodal TREF profile, a composition distribution breadth index CDBI50 of from about 45 wt % to about 75 wt % as determined by TREF and which further satisfies the relationship:
- (Mw/Mn)≧72 [(I21/I2)−1+10−6 (Mn)];
- and
- b) from about 95 to about 5 wt % of a second polyethylene copolymer which is a linear low density polyethylene (LLDPE) having a density of from about 0.910 to about 0.940 g/cm3, a melt index (I2) of from about 0.2 to about 5.0 g/10 min, and a melt flow ratio (I21/I2) of less than about 32.
1 more element
A polymer blend comprising:
- from about 5 to about 95 wt % of a first polyethylene copolymer having a density of from about 0.916 to about 0.936 g/cm3, a melt index (I2) of from about 0.1 to about 1.0 g/10 min, a melt flow ratio (I21/I2) of at least about 30, a molecular weight distribution (Mw/Mn) of from about 3.6 to about 6.5, a reverse comonomer distribution profile as determined by GPC-FTIR, a multimodal TREF profile, a composition distribution breadth index CDBI50 of from about 45 wt % to about 75 wt % as determined by TREF and which further satisfies the relationship:
- (Mw/Mn)≧72 [(I21/I2)−1+10−6 (Mn)];
- and
- b) from about 95 to about 5 wt % of a second polyethylene copolymer which is a linear low density polyethylene (LLDPE) having a density of from about 0.910 to about 0.940 g/cm3, a melt index (I2) of from about 0.2 to about 5.0 g/10 min, and a melt flow ratio (I21/I2) of less than about 35.
1 more element
Dependencies are inferred from the claim text.