US5234969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cured phenolic foams
Assignee: Cytec Industries Inc
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Filing: 1992-12-03
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Granted: 1993-08-10
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Expires: 2012-12-03
Abstract
Abstract Dimensionally stable, cured phenolic foams are described that have a thermal conductivity after 10-days below 0.0185 watts/m DEG C., a density of 30 to 70 kg/cubic meter and a closed-cell content of at least 85%.
Inventors
- 👤 Robert C. Clark
- 👤 Dean L. Kavanagh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:07
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/147; C08J9/144; C08J2361/00; C08J2361/04; C08J2361/06; Y; Y10; Y10S; Y10S521/00; Y10S521/918
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A method for producing a rigid, closed cell, phenolic resin foam comprising: (a) forming a partially expanded froth foam of a resole resin containing at least one easily vaporisable blowing agent, a polymerization catalyst and a surfactant; (b) further expanding and curing the froth foam to provide a rigid foam; (c) cutting the rigid foam into board pieces; and (d) hardening the rigid foam board pieces by subjecting them to a degree of cure substantially equivalent to the degree of cure achieved by heating to a temperature of about 60° C. for about 18 hours.
Claim 2
Independent Claim
95 words
A method for producing a rigid, closed cell, phenolic resin foam comprising: (a) forming a partially expanded froth foam of a resole resin containing at least one easily vaporisable blowing agent, a polymerization catalyst and a surfactant; (b) further expanding and curing the froth foam to provide a rigid foam; (c) cutting the rigid foam into board pieces; and (d) hardening the rigid foam board pieces by subjecting them to a degree of cure substantially equivalent to the degree of cure achieved by heating to a temperature of about 60° C. for about 18 hours.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the hardened rigid foam product possesses a closed cell content of at least 85%.
Claim 4
Independent Claim
122 words
A method for producing a rigid, closed cell, phenolic resin foam possessing dimensional stability at elevated temperatures, comprising: (a) forming a partially expanded froth foam of a resole resin containing at least one easily vaporisable blowing agent, a polymerization catalyst and a surfactant; (b) further expanding and curing the froth foam to provide a rigid foam; (c) cutting the rigid foam into board pieces; (d) hardening the rigid foam board pieces by subjecting them to a degree of cure substantially equivalent to the degree of cure achieved by heating to a temperature of about 60° C. for about 18 hours; and (e) subjecting the hardened rigid foam to a temperature of at least about 90° C. for at least about 1 hour.
Claim 5
Independent Claim
122 words
A method for producing a rigid, closed cell, phenolic resin foam possessing dimensional stability at elevated temperatures, comprising: (a) forming a partially expanded froth foam of a resole resin containing at least one easily vaporisable blowing agent, a polymerization catalyst and a surfactant; (b) further expanding and curing the froth foam to provide a rigid foam; (c) cutting the rigid foam into board pieces; (d) hardening the rigid foam board pieces by subjecting them to a degree of cure substantially equivalent to the degree of cure achieved by heating to a temperature of about 60° C. for about 18 hours; and (e) subjecting the hardened rigid foam to a temperature of at least about 90° C. for at least about 1 hour.
Claim 6
Dependent Claim
20 words
The method of claim 3 wherein the hardened rigid foam product possesses a closed cell content of at least 85%.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |