US3874990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retardant particle-board and process for making same
Assignee: Collins Pine Co
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Filing: 1973-06-13
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Granted: 1975-04-01
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Expires: 1993-06-13
Abstract
Abstract High flame retardancy is imparted to particleboard by treating it in the course of fabrication with a combination of alkaline borate chemicals and flame-retardant phosphoric aciddicyandiamide-formaldehyde resin. The alkaline borate chemicals, e.g., borax and boric acid, are dissolved and added to the wood chips prior to their conversion into flake form. Next the flameretardant resin, comprised of phosphoric acid, melamine or urea, dicyandiamide and formaldehyde, is added to the comminuted wood flakes, either before they are dried or, following drying, at the blender at which a bonding resin such as urea resin is mixed preparatory to the forming of the mixture into mats and its pressing into panels.
Inventors
- 👤 Lyle V Surdyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:11
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2971; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A PROCESS FOR MANUFACTUREING FIRE-RETARDANT COMPOSITE WOOD PRODUCT COMPRISING: FORMING COMMINUTED WOOD PARTICLES, DIFFUSING INTO SAID WOOD PARTICLES A FIRE-RETARDANT ALKALINE BORATE CHEMICAL, ADDING TO SAID WOOD PARTICLES A FORMALDEHYDE RESIN FORMED FROM FORMALDEHYDE, DICYANDIAMIDE, PHOSPHORIC ACID AND A REACTANT SELECTED FROM THE GROUP CONSISTING OF UREA AND MELAMINE, BLENDING A CURABLE BONDING RESIN WITH SAID WOOD PARTICLES, AND COMPRESSING SAID WOOD PARTICLES WITH SUFFICIENT PRESSURE AND TEMPERATURE TO CURE THE BONDING RESIN TO FORM A COMPOSITE WOOD PRODUCT.
Claim 2
Dependent Claim
79 words
A PROCESS FOR MANUFACTUREING FIRE-RETARDANT COMPOSITE WOOD PRODUCT COMPRISING: FORMING COMMINUTED WOOD PARTICLES, DIFFUSING INTO SAID WOOD PARTICLES A FIRE-RETARDANT ALKALINE BORATE CHEMICAL, ADDING TO SAID WOOD PARTICLES A FORMALDEHYDE RESIN FORMED FROM FORMALDEHYDE, DICYANDIAMIDE, PHOSPHORIC ACID AND A REACTANT SELECTED FROM THE GROUP CONSISTING OF UREA AND MELAMINE, BLENDING A CURABLE BONDING RESIN WITH SAID WOOD PARTICLES, AND COMPRESSING SAID WOOD PARTICLES WITH SUFFICIENT PRESSURE AND TEMPERATURE TO CURE THE BONDING RESIN TO FORM A COMPOSITE WOOD PRODUCT.
Claim 3
Dependent Claim
22 words
The process according to claim 1 further including the step of drying the wood particles before the bonding resin is blended therewith.
Claim 4
Dependent Claim
21 words
The process according to claim 1 wherein said curable bonding resin is selected from the group consisting of urea-formaldehyde and melamine-formaldehyde.
Claim 5
Dependent Claim
12 words
A fire-retardant composite wood product formed by the process in claim 1.
References Cited (Backward Citations)
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US2917408A
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |