Patent US4120923A successfully refreshed from Google Patents.
US4120923A
Expired / Lapsed
US
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Process for manufacturing foamed materials involving contacting a thin unbroken film of liquid resin with a gaseous blowing agent under pressure
Assignee: Bayer AG
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Filing: 1975-08-15
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Granted: 1978-10-17
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Expires: 1995-08-15
Abstract
Abstract Stable foams of reaction resins and/or condensation resins can be obtained by adding a blowing agent which is gaseous under normal conditions to the resin under pressure, the gas liquid interface being enlarged while dispensing with moving equipment, allowing the mixture to expand and to cure.
Inventors
- 👤 Werner Kloker
- 👤 Franz Bovender
- 👤 Franz Gromping
- 👤 Leonhard Goerden
- 👤 Harald Niesel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:36
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; B29C44/3446; B29C44/3453; B29B; B29B7/00; B29B7/74; B29B7/7404; B29B7/7409; B29B7/76; B29B7/7615; B29B7/7621; B29C44/02; B29C44/04; B29C44/06; Y; Y10; Y10S; Y10S264/00; Y10S264/02; Y10S264/05; Y10S264/13; Y10S264/17; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
A process of manufacturing foamed materials from a liquid thermosetting resin having a viscosity less than 6000 cP, comprising the steps of contacting a thin unbroken film of the liquid resin in a pressure vessel under pressure of 3 to 350 bars at a temperature of between 0° to 50° C. for a residence time of 0.1 to 120 minutes with a blowing agent having a boiling point under normal pressure which is below 0° C., causing the liquid resin to smoothly flow without absorbing discernible bubbles of the blowing agent down and over an elongated surface means having a vertical component disposed within the pressure vessel whereby the liquid resin film absorbs the blowing agent so rapidly that the resin film flowing off from the elongated surface means can immediately be withdrawn from the pressure vessel, deposited on a surface, subjected to pressure release, allowed to expand and to cure into a foamed resin.
Claim 2
Dependent Claim
155 words
A process of manufacturing foamed materials from a liquid thermosetting resin having a viscosity less than 6000 cP, comprising the steps of contacting a thin unbroken film of the liquid resin in a pressure vessel under pressure of 3 to 350 bars at a temperature of between 0° to 50° C. for a residence time of 0.1 to 120 minutes with a blowing agent having a boiling point under normal pressure which is below 0° C., causing the liquid resin to smoothly flow without absorbing discernible bubbles of the blowing agent down and over an elongated surface means having a vertical component disposed within the pressure vessel whereby the liquid resin film absorbs the blowing agent so rapidly that the resin film flowing off from the elongated surface means can immediately be withdrawn from the pressure vessel, deposited on a surface, subjected to pressure release, allowed to expand and to cure into a foamed resin.
Claim 3
Dependent Claim
124 words
The process as set forth in claim 1, wherein the liquid resin is caused to flow over a series of vertically disposed smooth plates in the pressure vessel by disposing the series of plates vertically in the pressure vessel with their upper ends passing through substantially closed apertures in a horizontal distributing bulkhead, the upper ends of the plates constituting overflow weirs within the pressure vessel, the liquid resin being supplied in front of the first overflow weir whereby liquid film first flows down the front and then the back surfaces of the first plate and thereafter down the following front and back surfaces of successive plates as the liquid resin builds up on the bulkhead and flows successively over each of the weirs.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein the liquid resin contacted in said pressure vessel contains at least one member selected from the group consisting of curing agents, accelerators and fillers.
References Cited (Backward Citations)
SU270765A1
Cited
US265974A
Cited
GB392475A
Cited
US2195449A
Cited
US2344560A
Cited
US2666036A
Cited
US2944966A
Cited
US2935762A
Cited
US3063952A
Cited
GB935198A
Cited
DE1504654A1
Cited
US3220801A
Cited
US3278659A
Cited
US3468987A
Cited
US3251092A
Cited
US3318588A
Cited
US3395193A
Cited
US3482947A
Cited
US3585786A
Cited
DE2017221A1
Cited
US3796779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |