US3959005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing wood material boards
Assignee: Individual
•
Filing: 1974-08-19
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Granted: 1976-05-25
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Expires: 1994-08-19
Abstract
Abstract Improved method of making wood composition boards is provided wherein wood raw materials, such as wood shavings, are pressed into boards and heated at a temperature of 180° - 250°C after having been treated with a urea bonding and flame-proofing agent which has been pre-reacted with a catalyst which is either a water soluble salt containing non-precious metal, such as Li, Na, K, Ca, Al, Mg, Zn, Fe, Co, Sn or Pb, or a water-soluble mono- or disaccharide, or an organic amine, or a solution of these catalyts. catalysts.
Inventors
- 👤 Henrik Bruun
- 👤 Heikki Savikko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:57
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
121 words
In a method of manufacture of wood material boards with urea as bonding agent, the improvement wherein to accelerate the method, urea is prereacted in a mixing reactor in the presence from about 1 to about 3% by weight based upon the wood material of a catalyst before it is sprayed into the wood raw material, said catalyst being selected from the group consisting of (a) water soluble salt of a non-precious metal, (b) water soluble mono- or disaccahride, (c) organic amine, and (d) a solution of (a), (b) or (c), and thereafter the activated resultant reaction mixture of urea is introduced into the wood based raw material and the material pressed into boards at a temperature of 180° to 250°C.
Claim 2
Dependent Claim
121 words
In a method of manufacture of wood material boards with urea as bonding agent, the improvement wherein to accelerate the method, urea is prereacted in a mixing reactor in the presence from about 1 to about 3% by weight based upon the wood material of a catalyst before it is sprayed into the wood raw material, said catalyst being selected from the group consisting of (a) water soluble salt of a non-precious metal, (b) water soluble mono- or disaccahride, (c) organic amine, and (d) a solution of (a), (b) or (c), and thereafter the activated resultant reaction mixture of urea is introduced into the wood based raw material and the material pressed into boards at a temperature of 180° to 250°C.
Claim 3
Dependent Claim
55 words
Improved method according to claim 1, wherein a 40 to 70 percent by weight water solution of urea containing up to 0.2 parts of catalyst calculated on the weight of urea, is heated and stirred until the urea starts to decompose, liberating ammonia, and thereafter the solution is immediately sprayed into said wood raw material.
Claim 4
Dependent Claim
29 words
Improved method according to claim 1, wherein said catalyst comprises at least one water soluble salt of Li, Na, K, Ca, Al, Mg, Zn, Fe, Co, Sn or Pb.
Claim 5
Dependent Claim
19 words
Improved method according to claim 1, wherein said catalyst comprises sulphite waste liquor containing water soluble mono- or disaccharide.
Claim 6
Dependent Claim
29 words
Improved method according to claim 1, wherein said catalyst comprises a tertiary amine selected from the group consisting of triethylene diamine, triethylamine, tetramethylene diamine, hexamethylene diamine and hexamethylene tetramine.
Claim 7
Dependent Claim
28 words
Improved method according to claim 2, wherein said catalyst comprises at least one water soluble salt of Li, Na, K, Ca, Al, Mg, Fe, Co, Sn or Pb.
Claim 8
Dependent Claim
19 words
Improved method according to claim 2, wherein said catalyst comprises sulphite waste liquor containing water soluble mono- or disaccharide.
Claim 9
Dependent Claim
13 words
Improved method according to claim 2, wherein said catalyst comprises a tertiary amine.
Claim 10
Dependent Claim
12 words
Improved method according to claim 2, wherein said catalyst comprises triethylene diamine.
Claim 11
Dependent Claim
11 words
Improved method according to claim 2, wherein said catalyst comprised triethylamine.
Claim 12
Dependent Claim
12 words
Improved method according to claim 2, wherein said catalyst comprises tetramethylene diamine.
Claim 13
Dependent Claim
12 words
Improved method according to claim 2, wherein said catalyst comprises hexamethylene diamine.
Claim 14
Dependent Claim
12 words
Improved method according to claim 2, wherein said catalyst comprises hexamethylene tetramine.
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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |