US2864784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous slurry plasticization of polyvinyl acetal resins
Assignee: EIDP Inc
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Filing: 1956-08-15
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Granted: 1958-12-16
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Expires: 1976-08-15
Abstract
No abstract record available.
Inventors
- 👤 Marks Barnard Mitchel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:59
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A PROCESS FOR PLASTICIZING A PARTIAL POLYVINYL ACETAL RESIN COMPRISING (A) FORMING A AQUEOUS SLURRY CONSISTING ESSENTIALLY OF (1) PARTICLES OF AN UNPLASTICIZED PARTIAL POLYVINYL ACETAL RESIN HAVING SIZE SUCH THAT AT LEAST 90% BY WEIGHT OF SAID PARTICLES WILL BE RETAINED ON A 60-MESH SCREEN (U.S. SIEVE SERIES), SAID RESIN BEING THE CONDENSATION PRODUCT OF POLYVINYL ALCOHOL AND AN ADEHYDE HAVING 2 TO 6 CARBON ATOMS PER MOLECULE, (2) A WATER-SOULBLE ESTER PLASTICZER FOR SAID RESIN WHICH IS PRESENT IN THE AMOUNT OF 10% TO 50% BY WEIGHT OF SAID RESIN, AND (3) WATER IN AMOUNT SUCH THAT THE WEIGHT RATIO OF (WATER): (RESIN PLUS PLASTICIZER) IS FROM 3:1 TO 20:1 (B) AGIATING SAID AQUEOUS SLURRY FOR A PERIOD OF 10 TO 100 MINUTES AT A POWER INPUT OF AT LEAST 1 HORSEPOWER PER 1000 GALLIONS OF SLURRY: (C) MAINTAINING THE TEMPERATURE OF SAID SLURRY FROM 20*C. TO 65*C DURING THE AGITATION; AND (D) RECONVERTING AN AQUEOUS SURRY OF NON-BLEEING, PLASTICIZED PARTIAL POLYVINYL ACETAL RESIN PARTICLES CONTAINING AT LEAST 90% OF THE PLASTICIZER ORDINALLY ADDED TO SAID SLURRY
Claim 2
Dependent Claim
179 words
A PROCESS FOR PLASTICIZING A PARTIAL POLYVINYL ACETAL RESIN COMPRISING (A) FORMING A AQUEOUS SLURRY CONSISTING ESSENTIALLY OF (1) PARTICLES OF AN UNPLASTICIZED PARTIAL POLYVINYL ACETAL RESIN HAVING SIZE SUCH THAT AT LEAST 90% BY WEIGHT OF SAID PARTICLES WILL BE RETAINED ON A 60-MESH SCREEN (U.S. SIEVE SERIES), SAID RESIN BEING THE CONDENSATION PRODUCT OF POLYVINYL ALCOHOL AND AN ADEHYDE HAVING 2 TO 6 CARBON ATOMS PER MOLECULE, (2) A WATER-SOULBLE ESTER PLASTICZER FOR SAID RESIN WHICH IS PRESENT IN THE AMOUNT OF 10% TO 50% BY WEIGHT OF SAID RESIN, AND (3) WATER IN AMOUNT SUCH THAT THE WEIGHT RATIO OF (WATER): (RESIN PLUS PLASTICIZER) IS FROM 3:1 TO 20:1 (B) AGIATING SAID AQUEOUS SLURRY FOR A PERIOD OF 10 TO 100 MINUTES AT A POWER INPUT OF AT LEAST 1 HORSEPOWER PER 1000 GALLIONS OF SLURRY: (C) MAINTAINING THE TEMPERATURE OF SAID SLURRY FROM 20*C. TO 65*C DURING THE AGITATION; AND (D) RECONVERTING AN AQUEOUS SURRY OF NON-BLEEING, PLASTICIZED PARTIAL POLYVINYL ACETAL RESIN PARTICLES CONTAINING AT LEAST 90% OF THE PLASTICIZER ORDINALLY ADDED TO SAID SLURRY
References Cited (Backward Citations)
US2291697A
Cited
US2720501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |