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US4670484A
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Difficulty flammable extruded articles, especially extruded boards, and a process for making them
Assignee: KARL DANZER FURNIERWERKE A GERMAN CORP
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Filing: 1984-11-02
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Granted: 1987-06-02
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Expires: 2004-11-02
Abstract
Abstract The disclosure relates to difficultly flammable wooden articles, especially chip boards comprising solid and pipe boards, prepared by extrusion from wooden chips and/or woody fibrous materials. The articles contain as a flame-retarding addend a product of (a) 50 to 99.5 weight % of a flame-retarding agent physically and chemically stable under extrusion conditions, preferably 75 to 99.5 weight % of a pulverulent, free-flowing ammonium polyphosphate of the general formula H.sub.(n-m)+2 (NH.sub.4).sub.m P.sub.n O.sub.3n+1 in which n stands for a whole number with an average value of about 20 to 800 and the ratio of m/n is about 1, and (b) about 0.5 to 50 weight % of a cured water-insoluble artificial resin encapsulating the individual particles of the flame-retarding agent or ammonium polyphosphate. The disclosure also relates to difficultly flammable boards veneered with wood or a laminate.
Inventors
- 👤 Fritz-Reichard Fuchs
- 👤 Horst Staendeke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:52
CPC Classifications
B; B27; B27N; B27N9/00; B27N3/00; B27N3/08; B27N3/28; B32; B32B; B32B21/00; B32B21/12; C; C08; C08K; C08K3/00; C08K3/32; C08K9/00; C08K9/08; C08L; C08L97/00; C08L97/02; C09; C09K; C09K21/00; C09K21/06; C09K21/12; C09K21/14; C08L2201/00; C08L2201/02; C08L61/00; C08L61/04; C08L61/06; C08L61/20; C08L61/26; C08L61/28; C08L63/00; C08L75/00; C08L75/04; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10S525/00; Y10S525/936; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
186 words
Difficulty flammable wooden articles, especially chip boards, comprising solid and pipe boards, prepared by extrusion from wooden chips and/or woody fibrous materials, containing as a flame-retarding agent a product of (a) 50 to 99.5 weight % of a pulverulent, free-flowing ammonium polyphosphate of the general formula H.sub.(n-m)+2 (NH.sub.4).sub.m P.sub.n O.sub.3n+1 in which n stands for a whole number with an average value of about 20 to 800 and the ratio of m/n is about 1, consisting of particles with a mean size of about 0.03 to 0.08 mm, and (b) 0.5 to 50 weight % of a cured, water-insoluble synthetic resin selected from the group consisting of (1) a polycondensation product of a polyol and an isocyanate, (2) a polycondensation product of a polyol and a polyisocyanate, (3) a polycondensation product of an isocyanate and/or a polyisocyanate, (4) a polycondensation product of an aromatic hydroxy compound and formaldehyde, (5) a polyisocyanate, (6) an epoxide resin, encapsulating the particles of said ammonium polyphosphate, the wooden articles containing the flame-retarding agent in a concentration of about 5 to 50%, based on the dry wooden chips and/or fibrous materials.
Claim 2
Dependent Claim
186 words
Difficulty flammable wooden articles, especially chip boards, comprising solid and pipe boards, prepared by extrusion from wooden chips and/or woody fibrous materials, containing as a flame-retarding agent a product of (a) 50 to 99.5 weight % of a pulverulent, free-flowing ammonium polyphosphate of the general formula H.sub.(n-m)+2 (NH.sub.4).sub.m P.sub.n O.sub.3n+1 in which n stands for a whole number with an average value of about 20 to 800 and the ratio of m/n is about 1, consisting of particles with a mean size of about 0.03 to 0.08 mm, and (b) 0.5 to 50 weight % of a cured, water-insoluble synthetic resin selected from the group consisting of (1) a polycondensation product of a polyol and an isocyanate, (2) a polycondensation product of a polyol and a polyisocyanate, (3) a polycondensation product of an isocyanate and/or a polyisocyanate, (4) a polycondensation product of an aromatic hydroxy compound and formaldehyde, (5) a polyisocyanate, (6) an epoxide resin, encapsulating the particles of said ammonium polyphosphate, the wooden articles containing the flame-retarding agent in a concentration of about 5 to 50%, based on the dry wooden chips and/or fibrous materials.
Claim 3
Dependent Claim
26 words
Difficulty flammable wooden articles as claimed in claim 1, wherein the index n stands for a whole number with an average value of 450 to 800.
Claim 4
Dependent Claim
16 words
Difficulty flammable wooden articles as claimed in claim 1, wherein the aromatic hydroxy compound is phenol.
Claim 5
Dependent Claim
16 words
Difficulty flammable wooden articles as claimed in claim 1, wherein the aromatic hydroxy compound is resorcinol.
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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |