US2879236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing starch and ureaformaldehyde adhesive and product obtained
Assignee: Union Bag and Paper Corp
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Filing: 1956-06-07
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Granted: 1959-03-24
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Expires: 1976-06-07
Abstract
No abstract record available.
Inventors
- 👤 Albert P Yundt
- 👤 Keith E Bradway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:58
CPC Classifications
C; C09; C09J; C09J103/00; C09J103/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A METHOD OF PREPARING IN LOW VISCOSITY STARCH ADHESIVE ADAPTED TO BE INSOLUBILIZED IN THE PRESENCE OF ACID AND HEATING AT ELEVATED TEMPERATURES TO A WATER-RESISTANT CONDITION COMPRISING, INTRODUCING A WATER SOLUTION UREA-FORMALDEHYDE RESIN HAVING A PH OF ABOUT 5.0 AND CONTAINING ABOUT 5 MOLES OF FORMALDEHYDE PER MOLE OF UREA INTO A WATER SOLUTION OF ACID HYDROLYZED STARCH, ADJUSTING THE PH OF THE MIXTURE TO PH OF 4-7, COOKING THE RESULTING ACID AQUEOUS MIXTURE OF UREA-FORMALDEHYDE RESIN SOLUTION AND STARCH SOLUTION AT A TEMPERATURE OF BETWEEN ABOUT 180* F. TO ABOUT 206* F. FOR A PERIOD OF TIME SUFFICIENT TO EFFECT A DROP IN THE VISCOSITY RISES, MIXYURE TO A MINIMUM AND BEFORE THE VICOSITY RISES, TERMINATING SAID COOKING, ADDING AN AMOUNT OF UREA TO SAID COOKED SOLUTION TO ADJUST THE TOTAL FORMALDEHYDE TO UREA MOLAL RATIO TO ABOUT 2, THEREBY OBTAINING A LOW VISCOSITY ADHESIVE CAPABLE OF INSOLUBILIZATION IN ACID CONDITION BY HEATING.
Claim 2
Independent Claim
155 words
A METHOD OF PREPARING IN LOW VISCOSITY STARCH ADHESIVE ADAPTED TO BE INSOLUBILIZED IN THE PRESENCE OF ACID AND HEATING AT ELEVATED TEMPERATURES TO A WATER-RESISTANT CONDITION COMPRISING, INTRODUCING A WATER SOLUTION UREA-FORMALDEHYDE RESIN HAVING A PH OF ABOUT 5.0 AND CONTAINING ABOUT 5 MOLES OF FORMALDEHYDE PER MOLE OF UREA INTO A WATER SOLUTION OF ACID HYDROLYZED STARCH, ADJUSTING THE PH OF THE MIXTURE TO PH OF 4-7, COOKING THE RESULTING ACID AQUEOUS MIXTURE OF UREA-FORMALDEHYDE RESIN SOLUTION AND STARCH SOLUTION AT A TEMPERATURE OF BETWEEN ABOUT 180* F. TO ABOUT 206* F. FOR A PERIOD OF TIME SUFFICIENT TO EFFECT A DROP IN THE VISCOSITY RISES, MIXYURE TO A MINIMUM AND BEFORE THE VICOSITY RISES, TERMINATING SAID COOKING, ADDING AN AMOUNT OF UREA TO SAID COOKED SOLUTION TO ADJUST THE TOTAL FORMALDEHYDE TO UREA MOLAL RATIO TO ABOUT 2, THEREBY OBTAINING A LOW VISCOSITY ADHESIVE CAPABLE OF INSOLUBILIZATION IN ACID CONDITION BY HEATING.
References Cited (Backward Citations)
US2487036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |