US4273887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of foams by condensation reactions
Assignee: Greif International Holding BV
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Filing: 1979-08-14
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Granted: 1981-06-16
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Expires: 1999-08-14
Abstract
Abstract An improved process for the production of thermoset foams having a predetermined shape by subjecting a reactive amine to a condensation reaction in an enclosed mould cavity, wherein the reaction is carried out under conditions whereby by-product water found during the reaction is substantially free to move out into a space adjacent to and in communication with said foam, and controlling the temperature and care of said foam by regulation of the web bulb temperature of the gaseous mass inside said space. Foam products made in accordance with the process of the invention, e.g. urea-formaldehyde furfuryl alcohol-based insulating foams, are also claimed.
Inventors
- 👤 Per L. Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:35
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J2361/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
95 words
A process for the preparation of a foam having a predetermined shape, wherein in the presence of a catalyst, a blowing agent and additives a reactive resin component is subjected to a condensation reaction, characterized in reacting the starting materials in an enclosed mould cavity under conditions wherein the water formed during the reaction is substantially free to move out into a space adjacent to and in communication with said foam, and controlling the temperature and the cure of said foam by regulation of the wet bulb temperature of the gaseous mass inside said space.
Claim 2
Dependent Claim
95 words
A process for the preparation of a foam having a predetermined shape, wherein in the presence of a catalyst, a blowing agent and additives a reactive resin component is subjected to a condensation reaction, characterized in reacting the starting materials in an enclosed mould cavity under conditions wherein the water formed during the reaction is substantially free to move out into a space adjacent to and in communication with said foam, and controlling the temperature and the cure of said foam by regulation of the wet bulb temperature of the gaseous mass inside said space.
Claim 3
Dependent Claim
51 words
A process according to claim 1 characterized in regulating the wet bulb temperature of the gaseous mass inside said space in such a way that subsequent to the initial exothermic reaction a predetermined temperature over the time is induced throughout the foam till substantial completion of the cure has been achieved.
Claim 4
Dependent Claim
42 words
A process according to claim 1 characterized in regulating the wet bulb temperature of the gaseous mass in communication with the foam at least over part of the process time to a value substantially equal to the temperature desired inside said foam.
Claim 5
Dependent Claim
34 words
A process according to claim 1 characterized in raising the curing temperature inside said foam, by increasing the wet bulb temperature of the gaseous mass in communication with said foam, either continuously or stepwise.
Claim 6
Dependent Claim
27 words
A process according to claim 3 or 4 characterized in regulating the wet bulb temperature to about 0°-5° C. below the cure temperature desired inside said foam.
Claim 7
Dependent Claim
54 words
A process according to claim 2 characterized in adjusting the wet bulb temperature of the air passing the foam within the range of 25° C. up to the range of 50° to 95° C. and simultaneously maintaining the dry bulb temperature of said air from 30° C. up to about 55° to 110° C.
Claim 8
Dependent Claim
19 words
A process according to claim 6 characterized in subjecting the primary cured foam to a high frequency energy treatment.
Claim 9
Dependent Claim
25 words
Process according to claim 1 characterized in that the high frequency energy treatment is followed by a further treatment at a controlled wet bulb temperature.
Claim 10
Dependent Claim
36 words
A process according to claim 1 characterized in improving the communication of said foam and said gaseous mass by covering the internal surfaces of said mould with a glass fibre tissue prior to the foaming operation.
Claim 11
Dependent Claim
31 words
A process according to claim 9 characterized in using a tissue made of glass staple fibres of 5-20 mm length and having a glass area weight of 30-90 gr/m 2 .
Claim 12
Dependent Claim
20 words
A process according to claim 1 characterized in using a resin substantially derived from furfuryl alcohol as the starting material.
Claim 13
Dependent Claim
17 words
A process according to claim 1 characterized in using a urea formaldehyde resin as the starting material.
Claim 14
Dependent Claim
19 words
A process according to claim 1 characterized in using phenolic resins modified with furfuryl alcohol as the starting material.
Claim 15
Dependent Claim
16 words
Thermoset insulation foam products, manufactured in a shaped form by a process according to claim 1.
References Cited (Backward Citations)
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US3821337A
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US4026980A
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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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |