Polypropylene composition
Abstract
Abstract A polypropylene composition capable of producing molded products having superior stiffness, impact resistance, transparency, resistance to whitening on impact on bending and luster is provided, which composition has (i) a styrene-ethylene·butylene-styrene block copolymer or a styrene-ethylene·propylene block copolymer each in 5 to 30% by weight based on the weight of the composition, blended with a highly crystalline propylene homopolymer (A) having a relationship between its isotactic pentad ratio (P) and melt flow rate (MFR) represented by an expression of 1.00≧P≧0.015 log MFR+0.955; (ii) a styrene-ethylene·butylene-styrene block copolymer or a styrene-ethylene·propylene block copolymer each in 5 to 30% by weight based on the weight of the composition and an ethylene-propylene copolymer rubber or a polyethylene each in 15% by weight based thereon, blended with the above (A), the blending proportion of (A) being 60% by weight or more based on the weight of the composition; or (iii) a styrene-ethylene·butylene-styrene block copolymer or a styrene-ethylene·propylene block copolymer, each in 5 to 30% by weight based on the weight of the composition, an ethylene-propylene rubber and polyethylene each in 15% by weight or less based thereon, blended with the above (A), the blending proportion of (A) being 60% by weight or more based thereon.
Inventors
- 👤 Yozo Shimomura
- 👤 Kinya Mori
- 👤 Osamu Kojima
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |