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US 6,143,813 AGranted
Propylene resin composition and stretched film produced therefrom
AssigneeJapan Polychem Corporation
InventorsTadashi Sezume, Yasunori Nakamura
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Abstract
Propylene resin composition containing propylene-.alpha.-olefin random copolymer, nucleating agent and spherical magnesium silicate particles. Stretched films.
Claims6
A propylene resin composition comprising:
- a propylene-.alpha.-olefin random copolymer composed mainly of propylene, the propylene-.alpha.-olefin random copolymer satisfying the following copolymer property requirements ( 1) to (4);
- a nucleating agent which, when added to the propylene-.alpha.-olefin random copolymer, can bring the isothermal crystallization time [B] at 115.degree. C. of the copolymer to a value satisfying the following requirements [I] and [II];
- and 0.01 to 1 parts by weight, based on 100 parts by weight of the propylene-.alpha.-olefin random copolymer, of spherical magnesium silicate particles having an average particle diameter of 0.5 to 7.0 .mu.m and a sphericity (f) of not less than 0.7:
- (i) copolymer property requirements
- (1) the melt flow rate of 1.0 to 20.0 g/10 min,
- (2) the melting peak temperature of 130 to 150.degree. C. as determined with a differential scanning calorimeter (DSC),
- (3) the extraction of not more than 4.0% by weight as extracted at 40.degree. C. using o-dichlorobenzene as a solvent, and
- (4) the ratio of the weight average molecular weight to the number average molecular weight of 1.5 to 7.0 as determined by gel permeation chromatography (GPC);
- and
- (ii) isothermal crystallization time at 115.degree. C.
- 50.ltoreq.[A]-[B].ltoreq.500 [I]
- [B].ltoreq.100 [II]
- wherein [A] represents the isothermal crystallization time (sec) at 115.degree. C. of the propylene-.alpha.-olefin random copolymer with the nucleating agent not added thereto as measured with DSC;
- and [B] represents the isothermal crystallization time (sec) at 115.degree. C. of the propylene-.alpha.-olefin random copolymer with the nucleating agent added thereto as measured with DSC.
11 more elements
A stretched film produced by forming a propylene resin composition into a sheet or a film and at least monoaxially stretching the sheet or film, the propylene resin composition comprising:
- a propylene-.alpha.-olefin random copolymer composed mainly of propylene, the propylene-.alpha.-olefin random copolymer satisfying the following copolymer property requirements (1) to (4);
- a nucleating agent which, when added to the propylene-.alpha.-olefin random copolymer, can bring the isothermal crystallization time [B] at 115.degree. C. of the copolymer to a value satisfying the following requirements [I] and [II];
- and 0.01 to 1 parts by weight, based on 100 parts by weight of the propylene-.alpha.-olefin random copolymer, of spherical magnesium silicate particles having an average particle diameter of 0.5 to 7.0 .mu.m and a sphericity (f) of not less than 0.7:
- (i) copolymer property requirements
- (1) the melt flow rate of 1.0 to 20.0 g/10 min,
- (2) the melting peak temperature of 130 to 150.degree. C. as determined with a differential scanning calorimeter (DSC),
- (3) the extraction of not more than 4.0% by weight as measured at 40.degree. C. using o-dichlorobenzene as a solvent, and
- (4) the ratio of the weight average molecular weight to the number average molecular weight of 1.5 to 7.0 as determined by gel permeation chromatography (GPC);
- and
- (ii) isothermal crystallization time at 115.degree. C.
- 50.ltoreq.[A]-[B].ltoreq.500 [I]
- [B].ltoreq.100 [II]
- wherein [A] represents the isothermal crystallization time (sec) at 115.degree. C. of the propylene-.alpha.-olefin random copolymer with the nucleating agent not added thereto as measured with DSC;
- and [B] represents the isothermal crystallization time (sec) at 115.degree. C. of the propylene-.alpha.-olefin random copolymer with the nucleating agent added thereto as measured with DSC.
11 more elements
Dependencies are inferred from the claim text.