Patent US4209433A successfully refreshed from Google Patents.
US4209433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bonding particle board and the like using polyisocyanate/phenolic adhesive
Assignee: United States Department of Agriculture
•
Filing: 1978-12-19
•
Granted: 1980-06-24
•
Expires: 1998-12-19
Abstract
Abstract A method of forming particle board characterized by the use of an adhesive comprising a polyisocyanate and a phenolic adhesive. Enhanced adhesive characteristics and other advantages are associated with the method in which the polyisocyanate is added to the wood particles, etc. prior to application of the phenolic adhesive.
Inventors
- 👤 Chung-Yun Hse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:31
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/54; C08G18/542; C08L; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
In a method of fabricating particle board and the like, wherein an organic polyisocyanate/phenolic resin adhesive is applied to wood furnish with subsequent application of heat and pressure to form the desired product, the improvement comprising the steps of: applying said polyisocyanate/phenolic resin adhesive wherein said adhesive comprises: (i) from about 10% to about 50% by weight of the organic polyisocyanate; and (ii) from about 50% to about 90% by weight of the phenolic resin; wherein said application comprises the steps of: (a) applying first to the wood furnish the organic polyisocyanate; and (b) applying next to the wood furnish the phenolic resin; and applying next to the resulting wood furnish/adhesive product sufficient heat and pressure to form the desired product.
Claim 2
Dependent Claim
121 words
In a method of fabricating particle board and the like, wherein an organic polyisocyanate/phenolic resin adhesive is applied to wood furnish with subsequent application of heat and pressure to form the desired product, the improvement comprising the steps of: applying said polyisocyanate/phenolic resin adhesive wherein said adhesive comprises: (i) from about 10% to about 50% by weight of the organic polyisocyanate; and (ii) from about 50% to about 90% by weight of the phenolic resin; wherein said application comprises the steps of: (a) applying first to the wood furnish the organic polyisocyanate; and (b) applying next to the wood furnish the phenolic resin; and applying next to the resulting wood furnish/adhesive product sufficient heat and pressure to form the desired product.
Claim 3
Dependent Claim
29 words
The method of claim 1, wherein said adhesive is applied in an amount of about 3 to about 6% dry weight based on the weight of the wood furnish.
Claim 4
Dependent Claim
18 words
The method of claim 1, wherein said phenolic resin is an alkaline condensation product of phenol and formaldehyde.
Claim 5
Dependent Claim
52 words
The method of claim 3, wherein said phenolic resin is applied as an aqueous dispersion having a resin solid content of about 40 to about 45% by weight, a pH of from about 9.5 to about 11.5 and a viscosity of from about 200 to 325 cps when measured at 25° C.
Claim 6
Dependent Claim
19 words
The method of claim 1, wherein said polyisocyanate is polymethylene polyphenyl isocyanate with an isocyanate functionality of about 2.7.
Claim 7
Dependent Claim
27 words
The method of claim 5 wherein said polyisocyanate is applied as in its liquid form having a viscosity of about 200 to 275 cps at 25° C.
Claim 8
Dependent Claim
35 words
The method of claim 1, wherein the adhesive comprises: (i) from about 20 to about 30% by weight of the polyisocyanate; and (ii) from about 70 to about 80% by weight of the phenolic resin.
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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |