US3919448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified elastomeric compositions, method and oil seals made therefrom
Assignee: Chicago Rawhide Manufacturing Co Inc
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Filing: 1973-07-30
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Granted: 1975-11-11
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Expires: 1993-07-30
Abstract
Abstract An oil seal and novel rubber composition especially adapted for use as an oil seal material and thus requiring highly specialized physical properties. The rubber comprises a major portion of a polyacrylate elastomer having therein up to about 25% of a modifier imparting outstanding low temperature performance to rubber compositions which are otherwise unsuited for use in very low temperature environments. A preferred seal is made from a rubber composition which includes, based on 100 parts of rubber, about 15 parts of a hydroxy terminated block polymer of ethylene oxide and propylene oxide. The acrylate rubbers which may be used are selected from a variety of compositions, including commercially available acrylate rubbers which are cured by a soap-sulfur cure mechanism.
Inventors
- 👤 Eugene R Dufresne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:13
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3284; C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/08; C08L71/00; C08L71/02; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24488; Y10T428/24777; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
AN OIL SEAL UNIT COMPRISING A RELATIVELY RIGID MOUNTING PORTION AND A FLEXIBLE BODY PORTION HAVING A LIP ADAPTED TO ENGAGE A PART TO BE SEALED, SAID LIP BEING FORMED FROM A MODIFIED, OIL RESISTANT CURED ACRYLATE ELASTOMERIC COMPOSITION HAVING, IN RELATION TO OTHERWISE SIMILAR BUT UNMODIFIED ACRYLATE RUBBER COMPOSITIONS, SUBSTANTIALLY GREATER LOW TEMPERATURE FLEXIBILITY AND SUBSTANTIALLY UNCHANGED RESISTANCE TO ATTACK BY HOT AIR AND HOT OIL, SAID MODIFIED COMPOSITION COMPRISING A CURED POLYMER OF AN ACRYLATE MATERIAL AND INCLUDING THEREIN UP TO ABOUT 25% OF A MODIFYING MATERIAL COMPRISED OF AN ALIPHATIC POLYETHER COMPOSITION, SAID MODIFYING MATERIAL FURTHER HAVING TERMINAL HYDRXYL GROUPS, HAVING AT LEAST A SUBSTANTIAL PORTION OF LOWER ALKYL SIDE GROUPS, AND HAVING A MOLECULAR WEIGHT OF FROM AT LEAST 1,000 UP TO ABOUT 12,000.
Claim 2
Dependent Claim
128 words
AN OIL SEAL UNIT COMPRISING A RELATIVELY RIGID MOUNTING PORTION AND A FLEXIBLE BODY PORTION HAVING A LIP ADAPTED TO ENGAGE A PART TO BE SEALED, SAID LIP BEING FORMED FROM A MODIFIED, OIL RESISTANT CURED ACRYLATE ELASTOMERIC COMPOSITION HAVING, IN RELATION TO OTHERWISE SIMILAR BUT UNMODIFIED ACRYLATE RUBBER COMPOSITIONS, SUBSTANTIALLY GREATER LOW TEMPERATURE FLEXIBILITY AND SUBSTANTIALLY UNCHANGED RESISTANCE TO ATTACK BY HOT AIR AND HOT OIL, SAID MODIFIED COMPOSITION COMPRISING A CURED POLYMER OF AN ACRYLATE MATERIAL AND INCLUDING THEREIN UP TO ABOUT 25% OF A MODIFYING MATERIAL COMPRISED OF AN ALIPHATIC POLYETHER COMPOSITION, SAID MODIFYING MATERIAL FURTHER HAVING TERMINAL HYDRXYL GROUPS, HAVING AT LEAST A SUBSTANTIAL PORTION OF LOWER ALKYL SIDE GROUPS, AND HAVING A MOLECULAR WEIGHT OF FROM AT LEAST 1,000 UP TO ABOUT 12,000.
Claim 3
Dependent Claim
27 words
A seal as defined in claim 1 in which said up to about 25% modifying material comprises from about 5% to about 25% of said modifying material.
Claim 4
Dependent Claim
20 words
A seal as defined in claim 1 in which said modifying material is present in an amount of about 15%.
Claim 5
Dependent Claim
22 words
A seal as defined in claim 1 in which said modifying material has a molecular weight of from about 3,500 to 7,000.
Claim 6
Dependent Claim
132 words
An oil seal unit comprising a relatively rigid mounting portion and a flexible body portion having a lip adapted to engage a part to be sealed, said lip being formed from a modified, oil resistant cured acrylate elastomeric composition having, in relation to otherwise similar but unmodified acrylate rubber compositions, substantially greater low temperature flexibility and substantially unchanged resistance to attack by hot air and hot oil, said modified composition comprising a cured acrylate elastomer containing up to about 25% of a modifier in the form of a block polymer formed from repeated propylene oxide units and repeated ethylene oxide units, and including a plurality of alkane side groups having four or less carbon atoms each, said polymer being hydroxy-terminated and having a molecular weight of from about 1,000 to about 12,000.
Claim 7
Dependent Claim
132 words
An oil seal unit comprising a relatively rigid mounting portion and a flexible body portion having a lip adapted to engage a part to be sealed, said lip being formed from a modified, oil resistant cured acrylate elastomeric composition having, in relation to otherwise similar but unmodified acrylate rubber compositions, substantially greater low temperature flexibility and substantially unchanged resistance to attack by hot air and hot oil, said modified composition comprising a cured acrylate elastomer containing up to about 25% of a modifier in the form of a block polymer formed from repeated propylene oxide units and repeated ethylene oxide units, and including a plurality of alkane side groups having four or less carbon atoms each, said polymer being hydroxy-terminated and having a molecular weight of from about 1,000 to about 12,000.
Claim 8
Dependent Claim
22 words
A seal as defined in claim 5 wherein said up to about 25% modifier is from about 6% to about 15% modifier.
Claim 9
Dependent Claim
22 words
A seal as defined in claim 5 in which said modifier has a molecular weight of from about 3,500 to about 7,000.
References Cited (Backward Citations)
US2718509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |