Patent US3864863A successfully refreshed from Google Patents.
Patent US4301217A successfully refreshed from Google Patents.
US4301217A
Expired / Lapsed
US
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Method of flameproofing wood with inorganic ammonium salts and dicyandiamide/formaldehyde reaction products
Assignee: BASF Corp
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Filing: 1979-10-17
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Granted: 1981-11-17
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Expires: 1999-10-17
Abstract
Abstract A process for flameproofing wood is claimed, which comprises treating the wood with aqueous preparations which contain (a) at least one water-soluble ammonium salt of a non-volatile inorganic acid, e.g. ammonium sulfate or ammonium phosphate, (b) at least one water-soluble cationic reaction product of dicyandiamide, formaldehyde, optionally an ammonium salt and/or an alkylenepolyamine containing at most 18 carbon atoms, or the acid salt thereof. Components (a) and (b) are applied in succession or preferably simultaneously and the wood is subsequently dried. The flameproof finish obtained is resistant to rinsing. The wood provided with the flameproof finish is used in particular as mine timber.
Inventors
- 👤 Peter Rohringer
- 👤 Hans Wegmuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:18
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/52; B27K3/02; B27K3/0278; B27K3/16; B27K3/20; B27K3/34; B27K5/00; B27K5/001; B27K5/04; B27K2240/00; B27K2240/30; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A process for flameproofing wood, which comprises impregnating wood with aqueous preparations containing (a) 50 to 300 g/l of a water-soluble ammonium salt of a non-volatile inorganic acid, and (b) 3 to 300 g/l of a water-soluble cationic reaction product of (b 1 ) dicyandiamine; (b 2 ) formaldehyde or formaldehyde donor; and at least one of (b 3 ) an ammonium salt, or (b 4 ) an alkylenepolyamine containing at most 18 carbon atoms, or the acid salts thereof, and subsequently drying the wood.
Claim 2
Dependent Claim
85 words
A process for flameproofing wood, which comprises impregnating wood with aqueous preparations containing (a) 50 to 300 g/l of a water-soluble ammonium salt of a non-volatile inorganic acid, and (b) 3 to 300 g/l of a water-soluble cationic reaction product of (b 1 ) dicyandiamine; (b 2 ) formaldehyde or formaldehyde donor; and at least one of (b 3 ) an ammonium salt, or (b 4 ) an alkylenepolyamine containing at most 18 carbon atoms, or the acid salts thereof, and subsequently drying the wood.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein component (a) is an ammonium salt of sulfamic acid, sulfuric acid, or of a phosphoric acid.
Claim 4
Dependent Claim
29 words
The process of claim 1, wherein (b 4 ) is an alkylenediamine, alkylenetriamine or alkylenetetramine containing 2 to 6 carbon atoms in the alkylene moiety, or the halide thereof.
Claim 5
Dependent Claim
19 words
The process of claim 1, wherein the weight ratio of component (a) to component (b) is 0.95:0.05 to 0.55:0.45.
Claim 6
Dependent Claim
40 words
The process of claim 1, wherein the wood is impregnated at elevated temperature with a preparation which is in the form of an aqueous solution, while alternately applying vacuum and excess pressure at a liquor ratio of 1:2 to 1:10.
Claim 7
Dependent Claim
15 words
The process of claim 1, wherein the wood is dried at 15° to 150° C.
Claim 8
Dependent Claim
23 words
The process of claim 1, wherein the wood is impregnated with a preparation which contains both components (a) and (b) and then dried.
Claim 9
Dependent Claim
13 words
The wood provided with a flameproof finish by the method of claim 1.
Claim 10
Dependent Claim
80 words
A preparation for carrying out the method of claim 7, said preparation containing (a) 50 to 300 g/l of a water-soluble ammonium salt of the non-volatile inorganic acid and (b) 3 to 300 g/l of a water-soluble cationic reaction product of (b 1 ) dicyandiamide; (b 2 ) formaldehyde or a formaldehyde donor; and at least one of (b 3 ) an ammonium salt; or (b 4 ) alkylenepolyamine containing at most 18 carbon atoms, or the acid salt thereof.
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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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |