US4071480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardener for production solid foams or compact structure from aqueous solutions
Assignee: Bayer AG
•
Filing: 1974-04-23
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Granted: 1978-01-31
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Expires: 1994-04-23
Abstract
Abstract In the production of foams or compact materials by adding an acidic hardener to an aqueous system containing at least one of an organic and an inorganic component capable of being hardened thereby, the improvement which comprises employing boron phosphate as said hardener. Preferred components comprise urea-formaldehyde or thiourea-formaldehyde and/or an alkali metal silicate. A polyhydric alcohol such as glycerine and/or a gelling agent may also be included along with a foaming agent.
Inventors
- 👤 Jakob Rademachers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C08K; C08K3/00; C08K3/38; C08K5/00; C08K5/04; C08K5/05; C08J2361/00; C08J2361/20; C08J2361/22; C08J2361/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
In the production of foams or compact materials by adding an acidic hardener to an aqueous system containing a resin selected from the group consisting of urea-formaldehyde and thiourea-formaldehyde component capable of being hardened thereby, and allowing said system to set to a hardened mass, the improvement which comprises employing about 3 to 15% by weight of boron phosphate as said hardener.
Claim 2
Dependent Claim
62 words
In the production of foams or compact materials by adding an acidic hardener to an aqueous system containing a resin selected from the group consisting of urea-formaldehyde and thiourea-formaldehyde component capable of being hardened thereby, and allowing said system to set to a hardened mass, the improvement which comprises employing about 3 to 15% by weight of boron phosphate as said hardener.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein a gelling agent is also included in said aqueous system.
Claim 4
Dependent Claim
16 words
The process of claim 1, wherein a polyhydric alcohol is also included in said aqueous system.
Claim 5
Dependent Claim
15 words
The process of claim 1, wherein the aqueous system further contains an alkali metal silicate.
Claim 6
Dependent Claim
21 words
The process of claim 3, wherein the polyhydric alcohol is glycerine and is employed in about 2 to 20% by weight.
Claim 7
Dependent Claim
43 words
The process of claim 5, wherein the organic component contained in said aqueous system comprises at least one of urea-formaldehyde and thiourea-formaldehyde, the system further contains an alkali metal silicate, and the boron phosphate is employed in about 10 to 15% by weight.
Claim 8
Dependent Claim
30 words
The process of claim 1, including the step of generating a gas within said aqueous system prior to completion of hardening, whereby a foam is produced upon completion of hardening.
Claim 9
Dependent Claim
13 words
The process of claim 1, wherein setting is effected at about ambient temperature.
References Cited (Backward Citations)
US3178299A
Cited
US3977888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |