Patent US4336351A successfully refreshed from Google Patents.
US4336351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified EP and EPDM blends with a cold flow additive
Assignee: Goodrich Corp
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Filing: 1981-02-23
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Granted: 1982-06-22
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Expires: 2001-02-23
Abstract
Abstract Ethylene and propylene copolymers and terpolymers are modified by addition of up to about 20% of crystalline polypropylene in order to reduce plastic flow which said copolymers and terpolymers undergo during storage but without significantly altering original physical properties thereof.
Inventors
- 👤 Bernard F. Cinadr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:44
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A raw and uncured heterogeneous composition that does not have a continuous polypropylene phase comprising, an essentially linear polymer of ethylene and propylene which normally exhibits plastic flow under ambient temperatures and storage conditions, said polymer of ethylene and propylene having yield strength of about 20 to 200 PSI, ultimate tensile strength of about 20 to 300 PSI, gel content of 1% or less and a low ethylene sequence index of less than about 25, and a sufficient amount up to about 20% by weight of added crystalline polypropylene having an average particle size of about 1/8" or in the range of about 0.1 to 1 millimeter to reduce the plastic flow but without significantly altering original physical properties of said polymer.
Claim 2
Dependent Claim
122 words
A raw and uncured heterogeneous composition that does not have a continuous polypropylene phase comprising, an essentially linear polymer of ethylene and propylene which normally exhibits plastic flow under ambient temperatures and storage conditions, said polymer of ethylene and propylene having yield strength of about 20 to 200 PSI, ultimate tensile strength of about 20 to 300 PSI, gel content of 1% or less and a low ethylene sequence index of less than about 25, and a sufficient amount up to about 20% by weight of added crystalline polypropylene having an average particle size of about 1/8" or in the range of about 0.1 to 1 millimeter to reduce the plastic flow but without significantly altering original physical properties of said polymer.
Claim 3
Dependent Claim
37 words
Composition of claim 1 wherein amount of said polypropylene is up to about 20% by weight based on the total weight of said polymer, said polypropylene having a melt flow rate of 0.5 to 30 g/10 min.
Claim 4
Dependent Claim
24 words
Composition of claim 2 wherein the polymer is selected from copolymers of ethylene and propylene and from terpolymers of ethylene, propylene and a diene.
Claim 5
Dependent Claim
41 words
Composition of claim 3 wherein the ethylene content of said copolymers and terpolymers is at least 40 mole %, the diene content of said terpolymers is less than about 10 mole %, and amount of said polypropylene is 1 to 10%.
Claim 6
Dependent Claim
21 words
Composition of claim 4 wherein the diene of said terpolymers is selected from 1,4-hexanediene, ethylidene norbornenes, dicyclopentadienes, cyclooctadienes, and mixtures thereof.
Claim 7
Dependent Claim
23 words
Composition of claim 3 wherein melt flow of said polypropylene is 1 to 20 g/10 min and amount thereof is 1 to 10%.
Claim 8
Dependent Claim
24 words
Composition of claim 4 wherein density of said polypropylene is 0.89 to 0.91 g/cc and its melt flow rate is 4 to 12/10 min.
Claim 9
Dependent Claim
18 words
Composition of claim 7 wherein said polypropylene is in a particulate form of about 1/8" average particle size.
Claim 10
Dependent Claim
12 words
Composition of claim 2 wherein said polypropylene is in a powder form.
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) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |