Patent US4312964A successfully refreshed from Google Patents.
US4312964A
Expired / Lapsed
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Polyolefin resin composition
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1980-08-14
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Granted: 1982-01-26
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Expires: 2000-08-14
Abstract
Abstract Polyolefin resin composition having an excellent resistance to blushing on impact, excellent gloss, high impact resistance and high stiffness, which comprises a specific ethylene/propylene block copolymer (A) consisting essentially of first and second segments of an ethylene/propylene copolymer having each a specific ethylene content and a copolymer of ethylene (B) selected from a specific polyethylene and a specific copolymer of ethylene and an alpha -olefin having 3 or more carbon atoms. The resin composition is useful for the production of molded products having excellent properties.
Inventors
- 👤 Noriyuki Sekine
- 👤 Shigeo Tanaka
- 👤 Kazuo Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:05
CPC Classifications
C; C08; C08L; C08L53/00; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A polyolefin resin composition which comprises an ethylene/propylene block copolymer (A) consisting essentially of at least one first segment of an ethylene/propylene copolymer having an ethylene content of 0.5 to 2.5% by weight, and at least one second segment of an ethylene/propylene copolymer having an ethylene content of 15 to 35% by weight, said second segment being contained in a proportion of 10 to 30% by weight based on the weight of the block copolymer (A), and a polymer of ethylene (B) selected from the group consisting of polyethylene and a copolymer of ethylene and an α-olefin having 3 or more carbon atoms, which has a density of 0.93 to 0.97 g/cm 3 and a melt flow index of 2.0 to 50 g/10 minutes at 190° C., said composition having a ratio (R) of the weight of the polymer of ethylene (B)/the weight of the second segment of the block copolymer (A) satisfying the following formula: 0.70≦R≦2.2
Claim 2
Dependent Claim
157 words
A polyolefin resin composition which comprises an ethylene/propylene block copolymer (A) consisting essentially of at least one first segment of an ethylene/propylene copolymer having an ethylene content of 0.5 to 2.5% by weight, and at least one second segment of an ethylene/propylene copolymer having an ethylene content of 15 to 35% by weight, said second segment being contained in a proportion of 10 to 30% by weight based on the weight of the block copolymer (A), and a polymer of ethylene (B) selected from the group consisting of polyethylene and a copolymer of ethylene and an α-olefin having 3 or more carbon atoms, which has a density of 0.93 to 0.97 g/cm 3 and a melt flow index of 2.0 to 50 g/10 minutes at 190° C., said composition having a ratio (R) of the weight of the polymer of ethylene (B)/the weight of the second segment of the block copolymer (A) satisfying the following formula: 0.70≦R≦2.2
Claim 3
Dependent Claim
29 words
A polyolefin resin composition according to claim 1, wherein the ethylene content in the first segment of ethylene/propylene copolymer is in the range of 1.0 to 2.0% by weight.
Claim 4
Dependent Claim
32 words
A polyolefin resin composition according to claim 1, wherein the second segment is contained in a proportion of 10 to 25% by weight based on the weight of the block copolymer (A).
Claim 5
Dependent Claim
43 words
A polyolefin resin composition according to claim 1, wherein the polymer of ethylene (B) is a polyethylene having a density of 0.94 to 0.97 g/cm 3 at 23° C. and a melt flow index of 4.0 to 50 g/10 minutes at 190° C.
Claim 6
Dependent Claim
32 words
A polyolefin resin composition according to claim 1, wherein the polymer of ethylene (B) is a copolymer of ethylene and an α-olefin selected from the group consisting of propylene, 1-butene, and 1-pentene.
References Cited (Backward Citations)
AT291556B
Cited
US3954704A
Cited
US3906056A
Cited
US3937758A
Cited
US4123417A
Cited
US4110414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |