Patent US3072044A successfully refreshed from Google Patents.
Patent US2916468A successfully refreshed from Google Patents.
US2916468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl alcohol containing ureaformaldehyde adehsive and method of preparing same
Assignee: Union Bag and Paper Corp
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Filing: 1957-03-20
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Granted: 1959-12-08
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Expires: 1977-03-20
Abstract
No abstract record available.
Inventors
- 👤 Albert P Yundt
- 👤 Keith E Bradway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:18
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; C; C08; C08G; C08G12/00; C08G12/46; C09; C09J; C09J129/00; C09J129/02; C09J129/04; C09J161/00; C09J161/20; C09J161/22; C09J161/24; C08L; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/14; C08L61/00; C08L61/20; C08L61/22; C08L61/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
A METHOD OF PREPARING A LOW VISCOSITY POLYVINYL ALCOHOL-CONTAINING ADHESIVE RESISTANT TO INCREASE IN VISCOSITY ON AGEING AND ADAPTED TO BE CURES IN THE PRESENCE OF ACID TO A WATER-RESISTANT CONDITION COMPRISING INTRODUCING INTO AN AQUEOUS SOLUTION CONTAINING HYDROLYZED POLYVINYL ACETATE AN AQUEOUS ACID SOLUTION OF UREA AND FORMALDEHYDE CONTAINING FORMALDEHYDE AND UREA IN MOL RATIO OF 2.5:1 TO 5:1, THERE BEING PRESENT A COMBINED WEIGHT OF UREA AND FORMALDEHYDE WHICH IS ABOUT 5% IN EXCESS OF THE WEIGHT OF THE HYDROLYZED POLYVINYL ACETATE, SAID AQUEOUS SOLUTION PROVIDING MIXED METHYLOL UREAS, ADJUSTING THE MIXTURE TO A PH BETWEEN ABOUT 4 TO 7, COOKING THE MIXTURE AT A TEMPERATURE BETWEEN ABOUT 150* F. AND 205* F. FOR A PERIOD OF TIME SUFFICIENT TO CAUSE THE VICOSITY OF SAID MIXTURE TO RISE, ADDING AN AMOUNT OF UREA TO SAID COOKED SOLUTION TO ADJUST THE TOTAL MOL RATIO OF FORMALDEHYDE TO UREA TO FROM ABOUT 1.6:1 TO ABOUT 2.5:1, SAID ADDITIONAL UREA BEING AT LEAST 15% OF THE TOTAL WEIGHT OF UREA IN SAID MIXTURE, WHEREBY THERE IS OBTAINED A LOW VISCOSITY ADHESIVE CAPABLE OF CURING IN ACID CONDITION BY HEATING.
Claim 2
Independent Claim
188 words
A METHOD OF PREPARING A LOW VISCOSITY POLYVINYL ALCOHOL-CONTAINING ADHESIVE RESISTANT TO INCREASE IN VISCOSITY ON AGEING AND ADAPTED TO BE CURES IN THE PRESENCE OF ACID TO A WATER-RESISTANT CONDITION COMPRISING INTRODUCING INTO AN AQUEOUS SOLUTION CONTAINING HYDROLYZED POLYVINYL ACETATE AN AQUEOUS ACID SOLUTION OF UREA AND FORMALDEHYDE CONTAINING FORMALDEHYDE AND UREA IN MOL RATIO OF 2.5:1 TO 5:1, THERE BEING PRESENT A COMBINED WEIGHT OF UREA AND FORMALDEHYDE WHICH IS ABOUT 5% IN EXCESS OF THE WEIGHT OF THE HYDROLYZED POLYVINYL ACETATE, SAID AQUEOUS SOLUTION PROVIDING MIXED METHYLOL UREAS, ADJUSTING THE MIXTURE TO A PH BETWEEN ABOUT 4 TO 7, COOKING THE MIXTURE AT A TEMPERATURE BETWEEN ABOUT 150* F. AND 205* F. FOR A PERIOD OF TIME SUFFICIENT TO CAUSE THE VICOSITY OF SAID MIXTURE TO RISE, ADDING AN AMOUNT OF UREA TO SAID COOKED SOLUTION TO ADJUST THE TOTAL MOL RATIO OF FORMALDEHYDE TO UREA TO FROM ABOUT 1.6:1 TO ABOUT 2.5:1, SAID ADDITIONAL UREA BEING AT LEAST 15% OF THE TOTAL WEIGHT OF UREA IN SAID MIXTURE, WHEREBY THERE IS OBTAINED A LOW VISCOSITY ADHESIVE CAPABLE OF CURING IN ACID CONDITION BY HEATING.
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) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |