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Patent US4634735A successfully refreshed from Google Patents.
US4634735A
Expired / Lapsed
US
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Polypropylene compositions with high impact strength
Assignee: BP Chemicals Ltd
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Filing: 1984-04-18
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Granted: 1987-01-06
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Expires: 2004-04-18
Abstract
Abstract The invention concerns polypropylene compositions with high impact strength adapted to the manufacture of car components such as bumpers or dashboards, characterized in that they contain: (a) 50 to 97% by weight of isotactic polypropylene (b) 2 to 49% by weight of elastomer (c) 1 to 30% by weight of linear low density polyethylene, of a density up to 0.935.
Inventors
- 👤 Jean P. Thiersault
- 👤 Alain Senez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:50
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
Polypropylene compositions of high impact strength, in which the polymeric component consists essentially of: (a) from 50 to 97% by weight of isotactic polypropylene (b) from 2 to 49% by weight of elastomer which is a rubber of the EPM or EPDM type (c) from 1 to 10% by weight of linear low density polyethylene formed by low pressure polymerisation in the gaseous phase in a fluidized bed and having a density of up to 0.928.
Claim 2
Dependent Claim
76 words
Polypropylene compositions of high impact strength, in which the polymeric component consists essentially of: (a) from 50 to 97% by weight of isotactic polypropylene (b) from 2 to 49% by weight of elastomer which is a rubber of the EPM or EPDM type (c) from 1 to 10% by weight of linear low density polyethylene formed by low pressure polymerisation in the gaseous phase in a fluidized bed and having a density of up to 0.928.
Claim 3
Dependent Claim
56 words
The compositions of claim 1, wherein all or part of the elastomer is incorporated in the composition by carrying out one or more stages of statistical copolymerisation of a mixture of ethylene and propylene, containing about 20% to about 70% by weight of propylene, at the end of or during the synthesis of the isotactic polypropylene.
Claim 4
Dependent Claim
61 words
The compositions of claim 1, wherein the linear low density polyethylene is obtained by copolymerising, 80 to 96% by weight of ethylene with 4 to 20% by weight of one or more upper alphaolefins containing 3 to 8 carbon atoms, selected particularly from propylene, 1-n-butene, 1-n-hexene, 4-methyl-1-pentene or 1-n-octene, the copolymerization being carried out at a pressure below 4.10 6 Pa.
Claim 5
Dependent Claim
20 words
The compositions of claim 1, with inorganic fillers added to them in quantities of up to 100% of their weight.
Claim 6
Dependent Claim
17 words
A method of preparing the compositions of claim 1, comprising mixing the constituents in the melted state.
Claim 7
Dependent Claim
26 words
The method of claim 5, wherein the constituents are first mixed in powder form, then mixed in the melted state in the normal type of extruder.
Claim 8
Dependent Claim
26 words
A process for the manufacture of various articles with high impact strength, comprising using a composition according to claim 1 for the preparation of said article.
Claim 9
Dependent Claim
14 words
A process according to claim 7, wherein said article is a bumper for cars.
Claim 10
Dependent Claim
14 words
A process according to claim 7, wherein said article is a dashboard for cars.
Claim 11
Dependent Claim
76 words
A polypropylene composition of high impact strength, in which the polymeric component comprises (a) from 80% to 97% by weight of isotactic polypropylene, (b) from 2% to 14% by weight of elastomer which is a rubber of the EPM or EPDM type, and (c) from 1% to 6% by weight of linear low density polyethylene formed by low pressure polymerization in the gaseous phase in a fluidised bed and having a density of up to 0.928.
Claim 12
Dependent Claim
76 words
A polypropylene composition of high impact strength, in which the polymeric component comprises (a) from 80% to 97% by weight of isotactic polypropylene, (b) from 2% to 14% by weight of elastomer which is a rubber of the EPM or EPDM type, and (c) from 1% to 6% by weight of linear low density polyethylene formed by low pressure polymerization in the gaseous phase in a fluidised bed and having a density of up to 0.928.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |