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US 6,191,219 B1Granted
Polypropylene resin composition and non-stretched film thereof
AssigneeMitsui Chemicals, Inc.
InventorsYasuo Tanaka, Norihiko Nakagawa, Naoto Yasaka
Life of this patent
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Abstract
A polypropylene resin composition capable of bringing about a non-stretched film superior in the transparency, in the impact resistance, in the low temperature heat-sealability and in the strength of heat-sealing, which composition comprises (A) a polypropylene resin, (B) a specific ethylene/α-olefin random copolymer and (C) a specific propylene/ethylene/1-butene random copolymer.
Claims7
A polypropylene resin composition for non-stretched monolayer film, comprising
- (A) 50-95 parts by weight of a polypropylene resin,
- (B) 3-40 parts by weight of an ethylene/α-olefin random copolymer with the α-olefin having at least three carbon atoms, the said random copolymer having a content of the structural unit of ethylene of 60-95 mole %, a density of 0.900 g/cm3 or lower, an MFR (melt flow rate), determined according to ASTM D-1238 at 190° C. under a load of 2.16 kg, of 0.1-50 g/10 min. and a molecular weight distribution expressed by Mw/Mn, determined by gel permeation chromatography (GPC), of 3 or less, and
- (C) 2-20 parts by weight of a propylene/ethylene/1-butene random copolymer, which meets the three conditions 1), 2) and 3) given below,
- wherein the amounts of (A), (B) and (C) sum up to 100 parts by weight and wherein the said random copolymer (C) meets the following three conditions, namely,
- condition 1) that it comprises 50-88 mole % of propylene unit, 2-30 mole % of ethylene units and 10-40 mole % of 1-butene unit and that the content of the 1-butene unit is greater than the content of ethylene unit;
- condition 2) that it has an MFR, determined according to ASTM D-1238 at 230° C. under a load of 2.16 kg, of 0.1-50 g/10 min.;
- and
- condition 3) that is has a molecular weight distribution expressed by Mw/Mn, determined by gel permeation chromatography (GPC), of 3 or less.
5 more elements
A non-stretched film of a polypropylene resin composition consisting essentially of
- (A) 50-95 parts by weight of a polypropylene resin,
- (B) 3-40 parts by weight of an ethylene/1-butene random copolymer, the said random copolymer having a content of the structural unit of ethylene of 70-90 mole %, density of 0.850 to 0.880 g/cm3 or lower, an MFR (melt flow rate), determined according to ASTM D-1238 at 190° C. under a load of 2.16 kg, of 0.5-10 g/10 min. and a molecular weight distribution expressed by Mw/Mn, determined by gel permeation chromatography (GPC), of 3 or less, and
- (C) 2-20 parts by weight of a propylene/ethylene/1-butene random copolymer, which meets the three conditions 1), 2) and 3) given below,
- wherein the amounts of (A), (B) and (C) sum up to 100 parts by weight and wherein the said random copolymer (C) meets the following three conditions, namely,
- condition 1) that it comprises 60-85 mole % of propylene unit, 10.2-20 mole % of ethylene unit and 12-30 mole % of 1-butene unit and that the content of 1-butene unit is greater than the content of ethylene unit;
- condition 2) that is has an MFR, determined according to ASTM D-1238 at 230° C. under a load of 2.16 kg, of 0.1-10 g/10 min.;
- and
- condition 3) that it has a molecular weight distribution expressed by Mw/Mn, determined by gel permeation chromatography (GPC), of 3 or less.
5 more elements
A non-stretched film of a polypropylene resin composition consisting essentially of
- (A) 80-85 parts by weight of a polypropylene resin,
- (B) 7.5-15 parts by weight of an ethylene/1-butene random copolymer, the said random copolymer having a content of the structural unit of ethylene of 89-95 mole %, a density of 0.855 to 0.900 g/cm3, an MFR (melt flow rate), determined according to ASTM D-1238 at 190° C. under a load of 2.16 kg of 0.5-3.6 g/10 min. and a molecular weight distribution expressed by Mw/Mn, determined by gel permeation chromatography (GPC), of 2.0 to 3, and
- (C) 5-10 parts by weight of a propylene/ethylene/1-butene random copolymer, which meets the three conditions 1), 2) and 3) given below,
- wherein the amounts of (A), (B) and (C) sum up to 100 parts by weight and wherein the said random copolymer (C) meets the following three conditions, namely,
- condition 1) that is comprises 68.5-88 mole % of propylene unit, 10.2-30 mole % of ethylene unit and 21.3-40 mole % of 1-butene unit and that the content of 1-butene unit is greater than the content of ethylene unit;
- condition 2) that is has an MFR, determined according to ASTM-D 1238 at 230° C. under a load of 2.16 kg, of 0.1-4.4 g/10 min.;
- and
- condition 3) that is has a molecular weight distribution expressed by Mw/Mn, determined by gel permeation chromatography (GPC), of 2.3 to 3.
5 more elements
Dependencies are inferred from the claim text.