US4059651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable blends of EPDM and polypropylene
Assignee: Advanced Elastomer Systems LP
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Filing: 1975-07-14
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Granted: 1977-11-22
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Expires: 1995-07-14
Abstract
Abstract An EPDM elastomer (e.g. ethylene/propylene/ethylidene norbornene) is blended with polypropylene (70-98 wt. %) and a halogenated phenol resin (1-20 parts per 100 parts of the elastomer). The blend may be cured and molded to provide articles having high flexural modulus and high impact resistance at low temperatures.
Inventors
- 👤 William S. Smith, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:54
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L2205/00; C08L2205/03; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/16; C08L23/18; C08L23/20; C08L23/22; C08L23/26; C08L23/28; C08L23/283; C08L61/00; C08L61/04; C08L61/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A molded article exhibiting improved impact resistance in the cured state, said article being prepared from a polymer blend consisting essentially of: a. 2 to 30% by weight of a cross-linkable EPDM elastomer wherein the diene component of said EPDM is ethylidene norbornene and said EPDM containing 1 to 20 parts per hundred of a bromomethyl alkylated phenol aldehyde resin as a cross-linking agent to effect curing of said elastomer; and b. 70 to 98% by weight of a stereoregular polypropylene, said polypropylene being an uncurable component, said elastomer being blended with polypropylene at a temperature above the melting point of the polypropylene, and said cross-linkable EPDM being completely cured by said resin when said blend is subjected to molding temperatures of 350° to 650° F.
Claim 2
Dependent Claim
126 words
A molded article exhibiting improved impact resistance in the cured state, said article being prepared from a polymer blend consisting essentially of: a. 2 to 30% by weight of a cross-linkable EPDM elastomer wherein the diene component of said EPDM is ethylidene norbornene and said EPDM containing 1 to 20 parts per hundred of a bromomethyl alkylated phenol aldehyde resin as a cross-linking agent to effect curing of said elastomer; and b. 70 to 98% by weight of a stereoregular polypropylene, said polypropylene being an uncurable component, said elastomer being blended with polypropylene at a temperature above the melting point of the polypropylene, and said cross-linkable EPDM being completely cured by said resin when said blend is subjected to molding temperatures of 350° to 650° F.
Claim 3
Dependent Claim
23 words
The molded article of claim 1 wherein said resin has a methylol content of about 9-14% and a bromine content of about 3-9%.
Claim 4
Dependent Claim
21 words
The molded article of claim 1 wherein said (a) component is present in an amount from 5 to 15% by weight.
Claim 5
Dependent Claim
20 words
The molded article of claim 1 having an Izod impact resistance value of 27 to 31 ft.-lbs./in. at -20° F.
Claim 6
Dependent Claim
16 words
The molded article of claim 1 wherein about 10% by weight of said EPDM is present.
References Cited (Backward Citations)
US3909463A
Cited
US3701702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |