US4319004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ternary thermoplastic molding composition containing polypropylene homopolymer
Assignee: Dynamit Nobel AG
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Filing: 1981-03-31
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Granted: 1982-03-09
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Expires: 2001-03-31
Abstract
Abstract A ternary molding composition formed from an admixture of ethylene-propylene copolymer, polypropylene homopolymer, and polyethylene, which comprises 38-48% by weight of a partially crystalline ethylene-propylene copolymer with an ethylene content of at least 65% by weight, a melt index MFI (230/5) of 0.7-2.0 g/10 min, and a tensile strength of higher than 5.0 N/mm 2 ; 27-63% by weight of a polypropylene homopolymer with a melt index MFI (230/5) of 25-65 g/10 min; and 3-30% by weight of polyethylene with a melt index MFI (230/5) of 15-20 g/10 min, the molding composition having a melt index MFI (230/5) of at least 8 g/10 min, a tensile strength of at least 15 N/mm 2 and an elongation at yield of at least 450%.
Inventors
- 👤 Paul Spielau
- 👤 Werner Kuhnel
- 👤 Dietmar Welsch
- 👤 Gerd Klingberg
- 👤 Hans E. Konermann
- 👤 Wilfried Leeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/16; C08L2205/00; C08L2205/03; C08L23/04; C08L23/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
A ternary molding composition formed from an admixture of ethylene-propylene copolymer, polypropylene homopolymer, and polyethylene, which comprises: (a) 38-48% by weight of a partially crystalline ethylene-propylene copolymer with an ethylene content of at least 65% by weight, a melt index MFI (230/5) of 0.7-2.0 g/10 min, and a tensile strength of higher than 5.0 N/mm 2 , (b) 27-62% by weight of polypropylene homopolymer with a melt index MFI (230/5) of 25-65 g/10 Min, and (c) 3-30% by weight of polyethylene with a melt index MFI (230/5) of 15-20 g/10 min, the molding composition having a melt index MFI (230/5) of at least 8 g/10 min, a tensile strength of at least 15 N/mm 2 and an elongation at yield of at least 450%.
Claim 2
Dependent Claim
124 words
A ternary molding composition formed from an admixture of ethylene-propylene copolymer, polypropylene homopolymer, and polyethylene, which comprises: (a) 38-48% by weight of a partially crystalline ethylene-propylene copolymer with an ethylene content of at least 65% by weight, a melt index MFI (230/5) of 0.7-2.0 g/10 min, and a tensile strength of higher than 5.0 N/mm 2 , (b) 27-62% by weight of polypropylene homopolymer with a melt index MFI (230/5) of 25-65 g/10 Min, and (c) 3-30% by weight of polyethylene with a melt index MFI (230/5) of 15-20 g/10 min, the molding composition having a melt index MFI (230/5) of at least 8 g/10 min, a tensile strength of at least 15 N/mm 2 and an elongation at yield of at least 450%.
Claim 3
Dependent Claim
23 words
A molding composition according to claim 1, wherein the ethylene-propylene copolymer and polypropylene homopolymer together comprise 70-97% by weight of the molding composition.
Claim 4
Dependent Claim
42 words
A molding composition according to one of claims 1 or 2, wherein instead of a part of polypropylene homopolymer, proportionately a part of propylene-ethylene copolymer is provided, having a melt index MFI (230/5) of 15-50, preferably between 20 and 40 g/10 min.
Claim 5
Dependent Claim
21 words
A molding composition according to claim 3, wherein a propylene-ethylene copolymer is provided with an ethylene content below 12% by weight.
Claim 6
Dependent Claim
27 words
A molding composition according to one of claims 1-4, wherein a polyethylene is provided with a melt index MFI (230/5) of between 20 and 40 g/10 min.
Claim 7
Dependent Claim
37 words
A molding composition according to claim 1, wherein the ethylene-propylene copolymer comprises an ethylene-propylene copolymer and/or an ethylene-propylene terpolymer containing 65-82% by weight of ethylene 18-35% by weight of propylene 0-8% by weight of a diene tercomponent.
Claim 8
Dependent Claim
21 words
A molding composition according to claim 6, wherein the ethylene-propylene copolymer has an ethylene content of more than 70% by weight.
Claim 9
Dependent Claim
31 words
A molding composition according to claim 7, wherein an ethylene-propylene terpolymer is provided having a tensile strength of at least 8.0 N/mm 2 , preferably higher than 20 N/mm 2 .
Claim 10
Dependent Claim
29 words
A molding composition according to claim 1, wherein the composition contains 40-45% by weight of ethylene-propylene copolymer, 35-58% by weight of polypropylene homopolymer, and 5-20% by weight of polyethylene.
Claim 11
Dependent Claim
16 words
A bumper for an automobile made by injection molding from the molding composition of claim 1.
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) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |