US3990928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cold adhesion of wood glues to wood particles
Assignee: BASF SE
•
Filing: 1974-10-29
•
Granted: 1976-11-09
•
Expires: 1994-10-29
Abstract
Abstract Improvement of the cold adhesion of glue resins, particularly phenoplast and aminoplast wood glues, by the addition of small amounts of a ligninsulfonate.
Inventors
- 👤 Christof Schmidt-Hellerau
- 👤 Otto Grabowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:38
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; C09; C09J; C09J161/00; C08L2666/00; C08L2666/02; C08L2666/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
In a process for the manufacture of glued wood parts or wood materials by wetting the wood parts or particles to be glued with a binder dissolved or dispersed in water followed by compression until the binder has hardened, the improvement which comprises wetting the wood parts on particles to be glued with a binder wherein said binder is prepared by mixing an aqueous solution of a urea-formaldehyde condensate having a urea-to-formaldehyde molar ratio of from about 1:1.2 to 1:1.8 with an amount of sodium ligninsulfonate in the range from an effective amount for improvement of the cold adhesion of said binder up to 5% by weight based on the weight of the condensate.
Claim 2
Dependent Claim
114 words
In a process for the manufacture of glued wood parts or wood materials by wetting the wood parts or particles to be glued with a binder dissolved or dispersed in water followed by compression until the binder has hardened, the improvement which comprises wetting the wood parts on particles to be glued with a binder wherein said binder is prepared by mixing an aqueous solution of a urea-formaldehyde condensate having a urea-to-formaldehyde molar ratio of from about 1:1.2 to 1:1.8 with an amount of sodium ligninsulfonate in the range from an effective amount for improvement of the cold adhesion of said binder up to 5% by weight based on the weight of the condensate.
Claim 3
Dependent Claim
22 words
A process as set forth in claim wherein said aqueous solution of urea-formaldehyde condensate has a concentration of from 45 to 70%.
Claim 4
Dependent Claim
22 words
A process as set forth in claim 1 wherein said ureaformaldehyde condensate is condensed up to the point of commencement of water-incompatibility.
Claim 5
Dependent Claim
28 words
A process as set forth in claim 1 wherein the weight of sodium ligninsulfonate is from 1 to 3% by weight based on the weight of the condensate.
References Cited (Backward Citations)
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Cited
US3025250A
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US3076772A
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US3296159A
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US3697355A
Cited
US3597375A
Cited
US3935139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |