US4439548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polyurethane product having improved load-bearing characteristics
Assignee: Individual
•
Filing: 1982-09-03
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Granted: 1984-03-27
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Expires: 2002-09-03
Abstract
Abstract A modified low-density flexible polyurethane foam product having a relatively high degree of firmness as well as commercially acceptable dielectric heat sealing characteristics. The product formulation includes an intermediate constituted by a mixture of polyol and a polymer/polyol in a ratio imparting to the product a predetermined degree of firmness, and a thermoplastic additive whose dielectric loss index is greater than the loss index of polyurethane foam to impart to the product an acceptable dielectric heating response in a high frequency electric field. This response is enhanced by a styrene component included in the polymer/polyol.
Inventors
- 👤 Morey Weisman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:30
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4072; C08J2375/00; C08J2375/04; C08J2427/00; C08J2431/00; Y; Y10; Y10T; Y10T428/00; Y10T428/15; Y10T428/23; Y10T428/233
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A modified flexible polyurethane foam product of low density derived from a formulation including an intermediate constituted by a mixture of a first polyol of a type adapted to yield a low density foam, and a polymer/polyol produced by polymerization of at least one monomer component in a second polyol in a ratio imparting to the product a predetermined degree of firmness which is greater than that obtainable in a foam derived entirely from the first polyol intermediate and is less than that obtainable in a foam derived entirely from a polymer/polyol intermediate, and a thermoplastic additive whose dielectric loss index is greater than that of a polyurethane foam; the additive being in a relative amount imparting to the modified product a loss index approaching that of polyvinyl chloride to produce an acceptable dielectric heating response in a high-frequency electric field.
Claim 2
Dependent Claim
141 words
A modified flexible polyurethane foam product of low density derived from a formulation including an intermediate constituted by a mixture of a first polyol of a type adapted to yield a low density foam, and a polymer/polyol produced by polymerization of at least one monomer component in a second polyol in a ratio imparting to the product a predetermined degree of firmness which is greater than that obtainable in a foam derived entirely from the first polyol intermediate and is less than that obtainable in a foam derived entirely from a polymer/polyol intermediate, and a thermoplastic additive whose dielectric loss index is greater than that of a polyurethane foam; the additive being in a relative amount imparting to the modified product a loss index approaching that of polyvinyl chloride to produce an acceptable dielectric heating response in a high-frequency electric field.
Claim 3
Dependent Claim
14 words
A product as set forth in claim 1, wherein said additive is polyvinyl chloride.
Claim 4
Dependent Claim
20 words
A product as set forth in claim 1, wherein said polymer/polyol includes a component which enhances the dielectric heating response.
Claim 5
Dependent Claim
13 words
A product as set forth in claim 3, wherein said component is styrene.
Claim 6
Dependent Claim
13 words
A product as set forth in claim 3, wherein said component is acrylonitrile.
Claim 7
Dependent Claim
14 words
A product as set forth in claim 1, wherein said ratio is about 50:50.
Claim 8
Dependent Claim
14 words
A product as set forth in claim 1, further including a non-amine blowing catalyst.
Claim 9
Dependent Claim
16 words
A product as set forth in claim 1, wherein said formulation further includes a fire-retarding agent.
References Cited (Backward Citations)
US2764565A
Cited
US2834748A
Cited
US3072582A
Cited
US3061460A
Cited
US3244571A
Cited
US3393119A
Cited
US3535197A
Cited
US3585062A
Cited
US3574149A
Cited
US4111865A
Cited
US4223098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |