US4258146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic fillers for elastomers
Assignee: International Business Machines Corp
•
Filing: 1979-09-28
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Granted: 1981-03-24
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Expires: 1999-09-28
Abstract
Abstract Organic prepolymer fillers capable of curing and reacting chemically with elastomers to form covalent bonds therewith are mixed with elastomers to form reinforcing domains with diameters of from 0.01 to about 50 microns, and when the mixture is cured, the mechanical strength of the elastomer is increased. In many cases, the thermal stability and/or the hydrolytic stability will also be increased.
Inventors
- 👤 Richard D. Balanson
- 👤 James Economy
- 👤 Samuel J. Huang
- 👤 Thor L. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:53
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08L21/00; C08G; C08G77/00; C08G77/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A process for increasing the mechanical strength of an elastomer, said process comprising the steps of: (1) forming a mixture of a silicone rubber elastomer containing reactive functionality with from about 1% to about 40% by weight of an organic prepolymer filler which contains functionality to react with said elastomer, (2) separating said filler into a separate phase of reinforcing domains having diameters of from 0.01 to about 50 microns dispersed throughout said elastomer, (3) curing the mixture to advance the molecular weight of the prepolymer filler and to bond it by covalent bonds to the elastomer.
Claim 2
Dependent Claim
97 words
A process for increasing the mechanical strength of an elastomer, said process comprising the steps of: (1) forming a mixture of a silicone rubber elastomer containing reactive functionality with from about 1% to about 40% by weight of an organic prepolymer filler which contains functionality to react with said elastomer, (2) separating said filler into a separate phase of reinforcing domains having diameters of from 0.01 to about 50 microns dispersed throughout said elastomer, (3) curing the mixture to advance the molecular weight of the prepolymer filler and to bond it by covalent bonds to the elastomer.
Claim 3
Dependent Claim
18 words
A process as claimed in claim 1 in which the prepolymer filler is a low molecular weight polyimide.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1 wherein the prepolymer filler is a polydiacetylene prepolymer having a molecular weight of about 800.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1 wherein the mixing is accomplished by dissolving the elastomer and the prepolymer filler in a mutual solvent.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 1 wherein the prepolymer filler having a particle size of from 0.01 to 50 microns in diameter, is physically mixed with the elastomer.
Claim 7
Dependent Claim
14 words
A process as claimed in claim 1 wherein the curing is accomplished by heating.
Claim 8
Dependent Claim
14 words
A process as claimed in claim 1 wherein the curing is accomplished by light.
Claim 9
Dependent Claim
15 words
A process as claimed in claim 1 wherein the curing is accomplished by chemical means.
References Cited (Backward Citations)
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US3962519A
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US3627836A
Cited
US3989768A
Cited
US3736290A
Cited
US4014851A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |