US3884993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
EPM and EPDM rubbers having improved processability
Assignee: DSM Copolymer Inc
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Filing: 1973-04-09
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Granted: 1975-05-20
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Expires: 1993-04-09
Abstract
Abstract Improved processability in EPM and EPDM rubbers has been achieved by blending a previously formed low molecular weight polymer with a previously formed high molecular weight polymer component in the ratios of 0.7 to 1.3 low molecular weight to high molecular weight components and in which in the EPM system the low molecular weight component has a molecular weight average of less than 10,000 and the high molecular weight component has a molecular weight average of ML1 8 at 300*F above 90 and in which the EPDM rubber has a low molecular weight component having a molecular weight average of less than 25,000 and a high molecular weight component having a high molecular weight of ML1 8 at 300*F in excess of 100.
Inventors
- 👤 Harold J Gros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:18
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/005; C08L; C08L23/00; C08L23/02; C08L23/16; C08J2323/00; C08J2323/02; C08J2323/16; C08L2205/00; C08L2205/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
197 words
THE METHOD OF IMPOVING THE PROCESSABILITY AND OZONE RESISTANCE CHARACTERISTICS OF ELASTOMERS OF ETHYLENE AND MONOOLEFIN HAVING FROM 3-16 CARBON ATOMS (EPM) AND ELASTOMERS OF ETHYLENE, A MONOOLEFIN HAVING FROM 3-16 CARBON ATOMS AND A POLYENE (EPDM) COMPRISING BLENDING SOLUTION OF SEPARATELY FORMED LOW MOLECULAR WEIGHT AND HIGH MOLECULAR WEIGHT POLYMERS OF THE RESPECTIVE ELASTOMERS, IN THE RATIO OF 0.7 TO 1.3 PARTS BY WEIGHT OF THE LOW MOLECULAR WEIGHT POLYMER PER 1 PART BY WEIGHT OF THE HIGH MOLECULAR WEIGHT POLYMER, IN WHICH, FOR THE EPDM ELASTOMRIC SYSTEM, THE LOW MOLECULAR WEIGHT POLYMER IS AN EPDM HAVING A MOLECULAR WEIGHT AVERAGE LESS THAN 25,000 AND THE HIGH MOLECULAR WEIGHT POLYMER IS AN EPDM HAVING AN AVERAGE MOLECULAR WEIGHT MEASURED BY MOONEY LEVEL OF ML1+8 AT 300*F WHICH IS GREATER THAN 100 AND IN WHICH, FOR EPM HAVING AN AVERAGE MOLECULAR WEIGHT POLYMER IS AN EPM HAVING AN AVERAGE MOLECULAR WEIGHT OF LESS THAN 10,000 AND THE HIGH MOLECULAR WEIGHT POLYMER IS AN EPM HAVING AN AVERAGE MOLECULAR WEIGHT MEASURED BY MOONEY LEVEL OF ML1+8 AT 300*F WHICH IS GREATER THAN 90, SEPARATING THE BLENDED SOLIDS BY COAGULATION, AND PROCESSING THE SOLID BLEND BY MILLING OR EXTRUSION.
Claim 2
Independent Claim
197 words
THE METHOD OF IMPOVING THE PROCESSABILITY AND OZONE RESISTANCE CHARACTERISTICS OF ELASTOMERS OF ETHYLENE AND MONOOLEFIN HAVING FROM 3-16 CARBON ATOMS (EPM) AND ELASTOMERS OF ETHYLENE, A MONOOLEFIN HAVING FROM 3-16 CARBON ATOMS AND A POLYENE (EPDM) COMPRISING BLENDING SOLUTION OF SEPARATELY FORMED LOW MOLECULAR WEIGHT AND HIGH MOLECULAR WEIGHT POLYMERS OF THE RESPECTIVE ELASTOMERS, IN THE RATIO OF 0.7 TO 1.3 PARTS BY WEIGHT OF THE LOW MOLECULAR WEIGHT POLYMER PER 1 PART BY WEIGHT OF THE HIGH MOLECULAR WEIGHT POLYMER, IN WHICH, FOR THE EPDM ELASTOMRIC SYSTEM, THE LOW MOLECULAR WEIGHT POLYMER IS AN EPDM HAVING A MOLECULAR WEIGHT AVERAGE LESS THAN 25,000 AND THE HIGH MOLECULAR WEIGHT POLYMER IS AN EPDM HAVING AN AVERAGE MOLECULAR WEIGHT MEASURED BY MOONEY LEVEL OF ML1+8 AT 300*F WHICH IS GREATER THAN 100 AND IN WHICH, FOR EPM HAVING AN AVERAGE MOLECULAR WEIGHT POLYMER IS AN EPM HAVING AN AVERAGE MOLECULAR WEIGHT OF LESS THAN 10,000 AND THE HIGH MOLECULAR WEIGHT POLYMER IS AN EPM HAVING AN AVERAGE MOLECULAR WEIGHT MEASURED BY MOONEY LEVEL OF ML1+8 AT 300*F WHICH IS GREATER THAN 90, SEPARATING THE BLENDED SOLIDS BY COAGULATION, AND PROCESSING THE SOLID BLEND BY MILLING OR EXTRUSION.
Claim 3
Dependent Claim
48 words
The method as claimed in claim 1 in which the average molecular weight for the low molecular weight component in an EPDM elastomer is less than 15,000 and the average molecular weight for the high molecular weight component is ML1 8 at 300*F which is greater than 130.
Claim 4
Dependent Claim
48 words
The method as claimed in claim 1 in which the average molecular weight for the low molecular weight component in an EPM elastomer is less than 5,000 and the average molecular weight of the high molecular weight component is ML1 8 at 300*F at between 100 and 140.
Claim 5
Dependent Claim
19 words
The method as claimed in claim 1 in which the EPM elastomer is an interpolymer of ethylene and propylene.
Claim 6
Dependent Claim
17 words
The method as claimed in claim 1 in which the monoolefin is propylene in the EPDM elastomer.
Claim 7
Dependent Claim
20 words
The method as claimed in claim 1 in which the polyene is a polyunsaturated, halogenated or unhalogenated bridged ring hydrocarbon.
Claim 8
Dependent Claim
24 words
The method as claimed in claim 1 in which the polyene is a 5-alkylidene-2-norbornene in which the alkylidene group contains from 1-20 carbon atoms.
Claim 9
Dependent Claim
24 words
The method as claimed in claim 1 in which the polyene is a 5-alkylidene-2-norbornene in which the alkylidene group contains from 1-8 carbon atoms.
Claim 10
Dependent Claim
13 words
The method as claimed in claim 1 in which the polyene is 5-ethylidene-2-norbornene.
Claim 11
Dependent Claim
53 words
The method as claimed in claim 1 in which for the EPDM elastomeric system the low molecular weight and the high molecular weight polymers are blended in the ratio of 0.5 to 1.3 parts by weight of the low molecular weight polymer per 1 part by weight of the high molecular weight component.
Claim 12
Dependent Claim
17 words
The method as claimed in claim 1 in which the solid blend is milled in a Banbury.
References Cited (Backward Citations)
US3378512A
Cited
US3468979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |