Patent US2217749A successfully refreshed from Google Patents.
Patent US4243761A successfully refreshed from Google Patents.
US4243761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel formed from a phenolic resin and a method for its manufacture
Assignee: Individual
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Filing: 1979-01-11
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Granted: 1981-01-06
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Expires: 1999-01-11
Abstract
Abstract A panel comprising fillers embedded in a closed cell expanded phenolic resin is made by making a mixture, which is initially fluid, of phenolic resin, a hardening agent, a surface active agent, a finely divided hydrophilic material and a porogenic agent, which has a boiling point above ambient temperature and below the polycondensation temperature of the mixture. This liquid mixture is mixed with fillers, for example balls or microspheres of glass or expanded material such as polystyrene. The resulting mixture is placed in a mould, only partially filling the mould, and heated progressively to a temperature in the neighborhood of the boiling point of the porogene agent, while evacuating the mould, and held at that temperature until the mixture has expanded to fill the mould. The temperature is then progressively increased to the polycondensation temperature to harden the expanded mixture.
Inventors
- 👤 Claude Savey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:34
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/35; B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/1209; C08J9/0066; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/147; C08J9/34; B29C44/14; C08J2361/00; C08J2361/04; C08J2361/06; Y; Y10; Y10S; Y10S264/00; Y10S264/02; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249994
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
145 words
A process of making a panel which comprises: forming a fluid mixture of phenolic resin, a hardening agent, a surface active agent, a finely divided hydrophilic material and a volatile liquid pore forming agent having a boiling point above ambient temperature during mixing and below the polycondensation temperature of said mixture, uniformly mixing said mixture with solid fillers in particulate form, partially filling a mould with said fluid mixture with said fillers therein and closing said mould, progressively raising the temperature of said mixture to a first temperature in the vicinity of the boiling point of said pore forming agent and maintaining said mixture at said temperature to produce maximum expansion of said mixture to fill said mould, and thereafter progressively raising the temperature of said mixture to a second temperature equal to the polycondensation temperature of said mixture to effect polycondensation of said mixture.
Claim 2
Dependent Claim
145 words
A process of making a panel which comprises: forming a fluid mixture of phenolic resin, a hardening agent, a surface active agent, a finely divided hydrophilic material and a volatile liquid pore forming agent having a boiling point above ambient temperature during mixing and below the polycondensation temperature of said mixture, uniformly mixing said mixture with solid fillers in particulate form, partially filling a mould with said fluid mixture with said fillers therein and closing said mould, progressively raising the temperature of said mixture to a first temperature in the vicinity of the boiling point of said pore forming agent and maintaining said mixture at said temperature to produce maximum expansion of said mixture to fill said mould, and thereafter progressively raising the temperature of said mixture to a second temperature equal to the polycondensation temperature of said mixture to effect polycondensation of said mixture.
Claim 3
Dependent Claim
21 words
A process according to claim 1, in which said mould is evacuated during heating before and during polycondensation of said mixture.
Claim 4
Dependent Claim
34 words
A process according to claim 1, in which the walls of said mould are covered with a layer of fibrous reinforcing material prior to the introduction of said fillers and mixture into said mould.
Claim 5
Dependent Claim
23 words
A process according to claim 1, in which said pore forming agent is a trichlorotrifluroethane having a boiling point of about 47° C.
Claim 6
Dependent Claim
18 words
A process according to claim 4, in which said mixture has a polycondensation temperature of about 60° C.
Claim 7
Dependent Claim
20 words
A process according to claim 4, in which first temperature to which said mixture is raised is about 40° C.
Claim 8
Dependent Claim
20 words
A process according to claim 1, in which said fillers comprise small balls of glass, expanded polystyrene or expanded clay.
Claim 9
Dependent Claim
21 words
A process according to claim 1, in which said hydrophilic material is selected from the group consisting of plaster and gypsum.
Claim 10
Dependent Claim
31 words
A process according to claim 1, in which the proportion of said hydrophilic material is between 30% to 60% by weight in relation to the weight of resin in the material.
Claim 11
Dependent Claim
39 words
A process according to claim 1, in which the composition of the mixture exists is a gel state before and during expansion in order to have such viscosity that a maximum quantity of the mixture gathers around the fillers.
Claim 12
Dependent Claim
10 words
A panel made by the method defined in claim 1.
Claim 13
Dependent Claim
10 words
A panel made by the method defined in claim 5.
Claim 14
Dependent Claim
10 words
A panel made by the method defined in claim 7.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |