Propylene polymer resin composition
AssigneeTosoh Corporation
InventorShigehiko Abe
Life of this patent
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Abstract
A propylene polymer resin composition comprising 50-99 wt. % of a propylene polymer resin and 1-50 wt. % of an ethylene polymer resin, wherein said ethylene polymer resin has the following characteristics (A) through (E): (A) a density (d), as measured by a density gradient tube method according to JIS K6760, of 940-960 kg/m3; (B) a melt flow rate (MFR), as measured at 190° C. under a load of 2.16 kg, of 1-10 g/10 min.; (C) a frequency of terminal vinyl of not more than 0.2 per 1,000 carbon atoms; (D) a melt strength (MS160), as measured at 160° C., of at least 100 mN; and (E) an activation energy of flow (Ea) of not larger than 35 kJ/mol. The propylene polymer resin has high melt strength and exhibits enhanced fluidity, processability and shapability.
Claims16
A propylene polymer resin composition, comprising:
- 50% to 99% by weight of a propylene polymer resin;
- and
- 1% to 50% by weight of an ethylene polymer resin,
- wherein the ethylene polymer resin has:
- (A) a density (d), as measured by a density gradient tube method according to JIS K6760, in the range of 940 kg/m3 to 960 kg/m3;
- (B) a melt flow rate (MFR), as measured at 190° C. under a load of 2.16 kg, in the range of 1 g/10 min. to 10 g/10 min.;
- (C) a frequency of terminal vinyl of not more than 0.2 per 1,000 carbon atoms;
- (D) a melt strength (MS160), as measured at 160° C., of at least 100 mN;
- and
- (E) an activation energy of flow (Ea) of not larger than 35 kJ/mol,
- and wherein the propylene polymer resin composition satisfies a relationship between a melt strength (MS190) and a melt flow rate (MFR), expressed by formula (7):
- MS190 >40−20×log(MFR) (7),
- wherein
- MS190 is a melt strength (mN) as measured at 190° C., and
- MFR is a melt flow rate (g/10 min.) as measured at 190° C. under a load of 2.16 kg.
An article, made by a process comprising foaming, blow molding, or extrusion foaming a propylene polymer resin composition, said propylene polymer resin composition comprising:
- 50% to 99% by weight of a propylene polymer resin;
- and
- 1% to 50% by weight of an ethylene polymer resin,
- wherein the ethylene polymer resin has:
- (A) a density (d), as measured by a density gradient tube method according to JIS K6760, in the range of 940 kg/m3 to 960 kg/m3;
- (B) a melt flow rate (MFR), as measured at 190° C. under a load of 2.16 kg, in the range of 1 g/10 min. to 10 g/10 min.;
- (C) a frequency of terminal vinyl of not more than 0.2 per 1,000 carbon atoms;
- (D) a melt strength (MS160), as measured at 160° C., of at least 100 mN;
- and
- (E) an activation energy of flow (Ea) of not larger than 35 kJ/mol,
- and wherein the propylene polymer resin composition satisfies a relationship between a melt strength (MS190) and a melt flow rate (MFR), expressed by formula (7):
- MS190 >40−20×log(MFR) (7),
- wherein
- MS190 is a melt strength (mN) as measured at 190° C., and
- MFR is a melt flow rate (g/10 min.) as measured at 190° C. under a load of 2.16 kg.
Dependencies are inferred from the claim text.