US2496480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyvinyl acetal resins of improved stability
Assignee: Shawinigan Resins Corp
•
Filing: 1946-06-12
•
Granted: 1950-02-07
•
Expires: 1966-06-12
Abstract
No abstract record available.
Inventors
- 👤 Lavin Edward
- 👤 Alfred T Marinaro
- 👤 William R Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:04
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR PREPARING A POLYVINYL BUTYRALDEHYDE ACETAL RESIN HAVING IMPROVED STABILITY, WHICH COMPRISES HEATING AT 40-100*C. A MIXTURE OF A SULFURIC ACID-HYDROLYZED POLYVINYL ACETATE, BUTYRALDEHYDE AND ETHANOL IN THE PRESENCE OF SULFURIC ACID UNTIL THE HYDROXYL GROUP CONTENT OF THE RESULTING POLYVINYL ACETAL RESIN DECREASES TO A SUBSTANTIALLY CONSTANT VALUE AND THEREAFTER MAINTAINING THE REACTION MIXTURE UNDER REACTING CONDITIONS UNTIL THE NON-EXTRACTABLE SULFUR CONTENT OF THE POLYVINAL ACETAL RESIN DECREASES TO A SUBSTANTIALLY CONSTANT VALUE, NOT OVER 1.3% SO4 GROUPS CALCULATED AS H2SO4 BEING PRESENT BASED ON THE TOTAL CHARGE AND THE ETHANOL BEING PRESENT IN THE AMOUNT OF 250-1000 PARTS FOR EVERY 100 PARTS OF THE HYDROLYZED POLYVINYL ACETATE.
Claim 2
Dependent Claim
111 words
A PROCESS FOR PREPARING A POLYVINYL BUTYRALDEHYDE ACETAL RESIN HAVING IMPROVED STABILITY, WHICH COMPRISES HEATING AT 40-100*C. A MIXTURE OF A SULFURIC ACID-HYDROLYZED POLYVINYL ACETATE, BUTYRALDEHYDE AND ETHANOL IN THE PRESENCE OF SULFURIC ACID UNTIL THE HYDROXYL GROUP CONTENT OF THE RESULTING POLYVINYL ACETAL RESIN DECREASES TO A SUBSTANTIALLY CONSTANT VALUE AND THEREAFTER MAINTAINING THE REACTION MIXTURE UNDER REACTING CONDITIONS UNTIL THE NON-EXTRACTABLE SULFUR CONTENT OF THE POLYVINAL ACETAL RESIN DECREASES TO A SUBSTANTIALLY CONSTANT VALUE, NOT OVER 1.3% SO4 GROUPS CALCULATED AS H2SO4 BEING PRESENT BASED ON THE TOTAL CHARGE AND THE ETHANOL BEING PRESENT IN THE AMOUNT OF 250-1000 PARTS FOR EVERY 100 PARTS OF THE HYDROLYZED POLYVINYL ACETATE.
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) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |