US5700844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a foamed polymer
Assignee: International Business Machines Corp
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Filing: 1996-04-09
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Granted: 1997-12-23
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Expires: 2016-04-09
Abstract
Abstract The invention relates to a process for making a foamed polymer. The process involves (a) dispersing thermally degradable solid particles in polymer precursor; (b) crosslinking the polymer precursor to form a rigid, crosslinked polymer without degrading the particles; and (c) heating the polymer to degrade the particles and form the polymer foam.
Inventors
- 👤 Jeffrey Curtis Hedrick
- 👤 James Lupton Hedrick
- 👤 Yun-Hsin Liao
- 👤 Robert Dennis Miller
- 👤 Da-Yuan Shih
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:23
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; C08J2201/00; C08J2201/04; C08J2201/046; C08J2383/00; C08J2383/04; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0373
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
51 words
A process for making a polysiloxane foam comprising the steps of: (a) dispersing thermally degradable polymer particles in polysiloxane precursor; (b) polymerizing the polysiloxane precursor to form rigid polysiloxane without degrading the particles; and (c) heating the polysiloxane to degrade the particles without expanding the polysiloxane and form the polysiloxane foam.
Claim 2
Dependent Claim
51 words
A process for making a polysiloxane foam comprising the steps of: (a) dispersing thermally degradable polymer particles in polysiloxane precursor; (b) polymerizing the polysiloxane precursor to form rigid polysiloxane without degrading the particles; and (c) heating the polysiloxane to degrade the particles without expanding the polysiloxane and form the polysiloxane foam.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein step (b) the polysiloxane is crosslinked.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the particles are comprised of polymethylmethacrylate.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein the polysiloxane foam has a pore size of about 1 to 10 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-22 | 2001-06-23 | 2001-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-22 | 2005-06-23 | 2005-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-22 | 2009-06-23 | 2009-12-23 | $7700.00 | Window Closed / Lapsed |