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US4319005A
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Ternary thermoplastic molding composition containing polypropylene copolymers
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 is formed of an admixture of ethylene-propylene copolymer, propylene polymer, and polyethylene and contains 30-45% 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 higher than 5.0 N/mm 2 ; 35-65% by weight of propylene polymer with a melt index MFI (230/5) of 15-50 g/10 min, and 3-30% by weight of polyethylene with a melt index MFI (230/5) of 15-50 g/10 min, said molding composition having a melt index MFI (230/5) of at least 8 g/10 min and 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
2026-10-31 21:44
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/14; C08L23/142; C08L23/16; C08L2205/00; C08L2205/02; C08L2205/03; C08L23/04; C08L23/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
A ternary molding composition formed of an admixture of ethylene-propylene copolymer, propylene polymer, and polyethylene which comprises: (a) 30-45% 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 higher than 5.0 N/mm 2 ; (b) 35-65% by weight of propylene polymer with a melt index MFI (230/5) of 15-50 g/10 min, and (c) 3-30% by weight of polyethylene with a melt index MFI (230/5) of 15-50 g/10 min, said molding composition having a melt index MFI (230/5) of at least 8 g/10 min and 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 of an admixture of ethylene-propylene copolymer, propylene polymer, and polyethylene which comprises: (a) 30-45% 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 higher than 5.0 N/mm 2 ; (b) 35-65% by weight of propylene polymer with a melt index MFI (230/5) of 15-50 g/10 min, and (c) 3-30% by weight of polyethylene with a melt index MFI (230/5) of 15-50 g/10 min, said molding composition having a melt index MFI (230/5) of at least 8 g/10 min and a tensile strength of at least 15 N/mm 2 and an elongation at yield of at least 450%.
Claim 3
Dependent Claim
24 words
A molding composition according to claim 1, wherein the ethylene-propylene copolymer and the propylene polymer together comprise 70-97% by weight of the molding composition.
Claim 4
Dependent Claim
26 words
A molding composition according to one of claims 1 or 2, wherein the propylene polymer has a melt index MFI (230/5) of between 20 and 40.
Claim 5
Dependent Claim
25 words
A molding composition according to one of claims 1 or 2, wherein the polyethylene has a melt index MFI (230/5) of between 20 and 40.
Claim 6
Dependent Claim
28 words
A molding composition according to one of claims 1 or 2, wherein the propylene polymer is a propylene-ethylene copolymer having an ethylene content of below 12% by weight.
Claim 7
Dependent Claim
38 words
A molding composition according to claim 1, wherein the ethylene-propylene copolymer comprises a bipolymer or a terpolymer made up of 65-82% by weight of ethylene 18-35% by weight of propylene 0-8% by weight of a non-conjugated 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
34 words
A molding composition according to claim 6 or 7, wherein the ethylene-propylene copolymer is a terpolymer having a tensile strength of at least 8 N/mm 2 , preferably higher than 20 N/mm 2 .
Claim 10
Dependent Claim
34 words
A molding composition according to claim 1, wherein the composition contains 35-43% by weight of the ethylene-propylene copolymer (a), 40-60% by weight of propylene polymer (b), and 5-20% by weight of the polyethylene (c).
Claim 11
Dependent Claim
15 words
A bumper for an automobile molded by injection-molding from the molding composition of claim 1.
References Cited (Backward Citations)
DE2821342A1
Cited
US4251646A
Cited
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 |