Claims
- 1. A blow molded container made of a polypropylene resin obtained by injection stretch blow molding of a polypropylene resin, characterized in that the polypropylene resin contains from 0.0003 to less than 0.1% to by weight of a 3-methylbutene-1 polymer, the 3-methylbutene-1 polymer having a melting point of at least 300.degree. C. and a heat of fusion of at least 9 cal/g.
- 2. The blow molded container made of a polypropylene resin according to claim 1, wherein the 3-methylbutene-1 polymer has a melting point of at least 303.degree. C. and a heat of fusion of at least 15 cal/g.
- 3. The blow molded container made of a polypropylene resin according to claim 1, wherein the 3-methybutene-1 polymer has a melting point of at least 305.degree. C. and a heat of fusion of at least 16 cal/g.
- 4. The blow molded container made of a polypropylene resin according to claim 1, wherein the polypropylene resin is a propylene polymer composition obtained by:
- preliminarily polymerizing 3-methylbutene-1, under the presence of a catalyst with an aluminum content of not more than 0.15 as expressed by the ratio of atoms of aluminum to titanium and comprising a solid titanium trichloride catalyst complex containing a complexing agent and an organic aluminum compound, and an electron donating compound, in an amount of greater than 10 g based on 1 g of said solid titanium trichloride catalyst complex, and then
- polymerizing propylene or propylene and other .alpha.-olefin of 2 to 18 carbon atoms by at least 500 g based on 1 g of said solid titanium trichloride catalyst complex.
- 5. The blow molded container made of a polypropylene resin according to claim 1, wherein the polypropylene resin is a mixture of (i) a propylene polymer composition and (ii) a propylene homopolymer or a copolymer of propylene with .alpha.-olefin of 2 to 18 carbon atoms,
- said propylene polymer composition (i) being obtained by:
- preliminarily polymerizing 3-methylbutene-1, under the presence of a catalyst with an aluminum content of not more than 0.15 as expressed as by the ratio of atoms of aluminum to titanium and comprising a solid titanium trichloride catalyst complex containing a complexing agent and an organic aluminum compound, and an electron donating compound, in an amount of greater than 10 g based on 1 g of said solid titanium trichloride catalyst complex, and then
- polymerizing propylene or propylene and other .alpha.-olefin of 2 to 18 carbon atoms in an amount by at least 500 g based on 1 g of said solid titanium trichloride catalyst complex.
- 6. The blow molded container made of a polypropylene resin according to claim 1, wherein the injection stretch blow molding is a molding method, which comprises injecting a molten resin of a propylene polymer composition containing from 0.0003 to less than 0.1% by weight of a 3-methylbutene-1 polymer at a temperature of 190.degree. to 290.degree. C. into a mold thereby forming a bottomed parison, and then applying, with or without preliminary blowing, stretch blow molding under the conditions at a resin temperature of 90.degree. to 150.degree. C. and a stretching ratio of 1.2 to 3.5 times in the longitudinal direction and 1.2 to 6.0 times in the lateral direction.
- 7. The blow molded container made of a polypropylene resin according to claim 1, which is in the form of a medical container suitable for fluid supplementation.
Priority Claims (4)
Number |
Date |
Country |
Kind |
1-77695 |
Mar 1989 |
JPX |
|
1-79174 |
Mar 1989 |
JPX |
|
2-4220 |
Jan 1990 |
JPX |
|
2-4221 |
Jan 1990 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/613,697, filed on Dec. 13, 1990, now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0251340 |
Jan 1988 |
EPX |
0369213 |
May 1990 |
EPX |
53-98353 |
Aug 1978 |
JPX |
1030797 |
May 1966 |
GBX |
1104665 |
Feb 1968 |
GBX |
Non-Patent Literature Citations (2)
Entry |
WPIL, File Supplier, AN=86-221342, Derwent Publications Ltd., London, GB; & JP-A-61 151 204, Jul. 9, 1986. |
WPIL, File Supplier, AN=88-124332, Derwent Publications Ltd., London, GB & JP-A-63 069 809, Mar. 29, 1988. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
613697 |
Dec 1990 |
|