US4113806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene impact blends having improved optical properties
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1976-08-30
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Granted: 1978-09-12
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Expires: 1996-08-30
Abstract
Abstract A polypropylene impact blend having a good overall balance of mechanical properties, particularly high impact strength, and surprisingly high clarity is disclosed which includes about 70 to about 90% by weight of a polypropylene, about 1 to about 18% by weight of a low density polyethylene and about 2 to about 24% by weight of an amorphous ethylene-propylene copolymer elastomer, with or without a non-conjugated diene, having a high combined ethylene content. The polypropylene impact blends are useful for making molded or extruded shaped articles and the like which are essentially clear.
Inventors
- 👤 Albert T. Watson
- 👤 Robert L. Hull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:20
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L2205/00; C08L2205/03; C08L23/04; C08L23/06; C08L23/16; C08L2310/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A polypropylene impact blend having high clarity and a good balance of overall mechanical properties, consisting essentially of: about 70 to about 95% by weight of polypropylene having a melt flow rate of from about 0.5 to about 30; about 1 to about 18% by weight of a low density polyethylene having a density of no more than about 0.929 g/cc and a melt index of from about 0.5 to about 50; and about 2 to about 24% by weight of an amorphous ethylene-propylene copolymer elastomer, with or without a non-conjugated diene, having a combined ethylene content of at least 50% by weight of said elastomer and a Mooney viscosity of from about 40 to about 120 ML 1+8' at 212° F.
Claim 2
Dependent Claim
122 words
A polypropylene impact blend having high clarity and a good balance of overall mechanical properties, consisting essentially of: about 70 to about 95% by weight of polypropylene having a melt flow rate of from about 0.5 to about 30; about 1 to about 18% by weight of a low density polyethylene having a density of no more than about 0.929 g/cc and a melt index of from about 0.5 to about 50; and about 2 to about 24% by weight of an amorphous ethylene-propylene copolymer elastomer, with or without a non-conjugated diene, having a combined ethylene content of at least 50% by weight of said elastomer and a Mooney viscosity of from about 40 to about 120 ML 1+8' at 212° F.
Claim 3
Dependent Claim
77 words
The polypropylene impact blend of claim 1, wherein the amorphous ethylene-propylene copolymer elastomer is selected from the group consisting of an ethylene-propylene binary copolymer elastomer, an ethylene-propylene-non-conjugated diene terpolymer elastomer, having a diene content of from about 1 to about 5% by weight, and mixtures thereof, said elastomer having a combined ethylene content of from about 60 to about 80% by weight and Mooney viscosity of from about 70 to about 100 ML 1+8' at 212° F.
Claim 4
Dependent Claim
33 words
The polypropylene impact blend of claim 1, wherein the low density polyethylene has a density of from about 0.915 to about 0.924 g/cc and a melt index of about 2 to about 30.
Claim 5
Dependent Claim
32 words
The polypropylene impact blend of claim 1, wherein the polypropylene is an isotactic polypropylene of greater than 90% hot heptane insolubles having a melt flow rate of about 1.0 to about 20.
Claim 6
Dependent Claim
27 words
The polypropylene impact blend of claim 1, wherein the weight ratio of amorphous ethylene-propylene copolymer elastomer to low density polyethylene is from about 1:1 to about 2:1.
Claim 7
Dependent Claim
62 words
The polypropylene impact blend of claim 1, wherein the polypropylene is present in an amount of from about 75 to about 90% by weight, the low density polyethylene is present in an amount of from about 3 to about 10% by weight, and the amorphous ethylene-propylene copolymer elastomer is present in an amount of from about 7 to about 15% by weight.
Claim 8
Dependent Claim
127 words
The polypropylene impact blend of claim 6, wherein the polypropylene is an isotactic polypropylene of greater than 90% hot heptane insolubles having a melt flow rate of from about 1 to about 20, the low density polyethylene has a density of about 0.915 to about 0.924 g/cc and a melt index of about 2 to about 30, and the ethylene-propylene copolymer elastomer is selected from the group consisting of an ethylene-propylene binary copolymer elastomer, an ethylene-propylene-non-conjugated diene terpolymer elastomer, having an unconjugated diene content of from about 1 to about 5 wt.%, a combined ethylene content of from about 60 to about 80% by weight, based upon the weight of said elastomer and a Mooney viscosity of about 70 to about 100 ML 1+8' at 212° F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |