Claims
- 1. A liner-provided vessel closure comprising a vessel closure shell and a liner formed on the inner face side of a top plate of the shell, wherein the liner is formed from a composition consisting essentially of (i) 10 to 60% by weight of a hydrogenated styrene/butadiene block copolymer having a melt index smaller than 0.1 g/10 min as determined at a temperature of 200.degree. C. under a load of 5 kg, (ii) 20 to 80% by weight of liquid paraffin and (iii) 5 to 60% by weight of a propylene resin.
- 2. A liner-provided vessel closure as set forth in claim 1, wherein the liquid paraffin has a viscosity of 50 to 400 cSt as measured at 37.8.degree. C.
- 3. A liner-provided vessel closure as set forth in claim 1, wherein the propylene resin is isotactic polypropylene having a melt index of 2 to 20 g/10 min.
- 4. A liner-provided vessel closure as set forth in claim 1, wherein the hydrogenated styrene/butadiene block copolymer contains 10 to 50% by weight of styrene blocks and has a hydrogenation degree of at least 85%.
- 5. A liner-provided vessel closure as set forth in claim 1, wherein the composition consists essentially of (i) 20 to 55% by weight of a hydrogenated styrene/butadiene block copolymer having a melt index smaller than 0.1 g/10 min as determined at a temperature of 200.degree. C. under a load of 5 kg, (ii) 30 to 60% by weight of liquid paraffin and (iii) 10 to 40% by weight of a propylene resin.
- 6. A liner-provided vessel closure as set forth in claim 1, wherein the hydrogenated styrene/butadiene block copolymer has a melt index smaller than 0.01 g/10 min as determined at a temperature of 200.degree. C. under a load of 5 kg.
- 7. A liner-provided vessel closure as set forth in claim 1, wherein the hydrogenated styrene/butadiene block copolymer is present in an amount of 20 to 55% by weight.
- 8. A liner-provided vessel closure as set forth in claim 1, wherein the liquid paraffin is present in an amount of 30 to 60% by weight.
- 9. A liner-provided vessel closure as set forth in claim 1, wherein the propylene resin is present in an amount of 10 to 40% by weight.
- 10. A liner-provided vessel closure as set forth in claim 2, wherein the liquid paraffin has a viscosity of 150 to 300 cSt as measured at 37.8.degree. C.
- 11. A liner-provided vessel closure as set forth in claim 3, wherein the isotactic polypropylene has a melt index of 5 to 15 g/10 min.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-196168 |
Aug 1988 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/357,500 filed May 26, 1989, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2802966 |
Jul 1978 |
DEX |
158276 |
Sep 1982 |
JPX |
8707903 |
Dec 1987 |
WOX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
357500 |
May 1989 |
|