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US 6,333,387 B1Granted
Ethylene copolymer composition
AssigneeMitsui Chemicals, Inc.
InventorsMamoru Takahashi, Seiichi Ikeyama, Akira Todo, Toshiyuki Tsutsui, Seiji Ohta, Hajime Inagaki
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Abstract
Ethylene/α-olefin copolymer with olefin type elastomer, each having particular properties, including density and melt flow rate, with a density ratio of elastomer to copolymer of less than 1, provide compostions which have excellent moldability and form films having high mechanical strength.
Claims2
An ethylene copolymer composition comprising:
- (A1) an ethylene/α-olefin copolymer in an amount of 60 to 99% by weight, which is obtained by copolymerizing ethylene with an α-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising (a) an organoaluminum oxy-compound and (b) at least two kinds of compounds of Group IV transition metals of the periodic table containing a ligand having a cyclopentadienyl skeleton, and which has such properties that:
- (i) the density is in the range of 0.850 to 0.980 g/cm3,
- (ii) the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 0.01 to 200 g/10 min,
- (iii) the melt tension, MT, in grams, at 190° C. and the melt flow rate (MFR) satisfy the relation
- MT>2.2×MFR−0.84, and
- (iv) the flow index, FI, in 1/sec, defined by a shear rate which is given when a shear stress of molten copolymer at 190° C. reaches 2.4×106 dyne/cm2 and the melt flow rate (MFR) satisfy the relation
- FI<150×MFR;
- and
- (B3) an olefin type elastomer in an amount of 1 to 40% by weight, said elastomer having such properties that
- (i) the density (d) is not more than 0.900 g/cm3, and
- (ii) the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 0.01 to 100 g/10 min;
- a density ratio ((B3)/(A1)) of the density of said olefin type elastomer (B3) to the density of said ethylene/α-olefin copolymer (A1) being less than 1.
9 more elements
An ethylene copolymer composition comprising:
- (A2) an ethylene/α-olefin copolymer in an amount of 60 to 99% by weight, which is obtained by copolymerizing ethylene with an α-olefin of 3 to 20 carbon atoms having such properties that:
- (i) the density is in the range of 0.850 to 0.980 g/cm3,
- (ii) the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 0.01 to 200 g/10 min,
- (iii) the melt tension, MT, in grams, at 190° C. and the melt flow rate (MFR) satisfy the relation
- MT>2.2×MFR−0.84, and
- (iv) the flow index, FI, in 1/sec, defined by a shear rate which is given when a shear stress of molten copolymer at 190° C. reaches 2.4×106 dyne/cm2 and the melt flow rate (MFR) satisfy the relation
- FI<150×MFR,
- (v) the molecular weight distribution (Mw/Mn) measured by GPC is in the range of 1.5 to 4, and
- (vi) MT/(Mw/Mn) and FI/MFR satisfy the relation MT/(Mw/Mn)>0.03×FI/MFR−3.0
- with the proviso that when the value of 0.03×FI/MFR−3.0 is less than 0, it is taken as 0;
- and
- (B3) an olefin type elastomer in an amount of 1 to 40% by weight, said elastomer having such properties that
- (i) the density (d) is not more than 0.900 g/cm3, and
- (ii) the melt flow rate (MFR) at 190° C. under a load of 2.16 kg is in the range of 0.01 to 100 g/10 min;
- a density ratio ((B3)/(A2)) of the density of said olefin type elastomer (B3) to the density of said ethylene/α-olefin copolymer (A2) being less than 1.
12 more elements
Dependencies are inferred from the claim text.