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Patent US3172876A successfully refreshed from Google Patents.
US3172876A
Expired / Lapsed
US
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Process for the manufacture of modified polyvinyl alcohols
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
•
Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:35
CPC Classifications
C; C08; C08F; C08F30/00; C08F30/02; C08F8/00; C08F8/44; C08F218/00; C08F218/02; C08F218/04; C08F218/08; Y; Y10; Y10S; Y10S516/00; Y10S516/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A PROCESS FOR THE MANUFACTURE OF A MODIFIED POLYVINYL ALCOHOL WHICH COMPRISES SUBJECTING A COPOLYMER OF COMPONENTS CONSISTING ESSENTIALLY OF (1) A VINYL ESTER OF A SATURATED CARBOXYLIC ACID CONTAINING 1 TO 18 CARBON ATOMS AND (2) FROM 0.1 TO 20 PERCENT BY WEIGHT, BASED ON TOTAL MONOMERS, OF AN ALKENYL PHOSPHONIC ACID DIALKYL ESTER, THE ALKENYL GROUPS OF WHICH CONTAIN 2 TO 3 CARBON ATOMS AND THE ALKYL GROUPS OF WHICH CONTAIN 1 TO 18 CARBON ATOMS, TO ALCOHOLYSIS IN THE PRESENCE OF AN ALCOHOLYSIS CATALYST, AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 15 TO 90*C., WITH METHANOL IN THE PRESENCE OF 0 TO 15 PERCENT WATER, CALCULATED ON THE WEIGHT OF THE XXX, WHILE DISSOLVED IN SAID METHANOL UNIT A XXX IS OBTAINED IN WHICH AT LEAST 80 PERCENT OF THE XXX OF SAID COMPONENT (1) ARE ALCOHOLIZED INTO VINYL ALCOHOL GROUPS.
Claim 2
Dependent Claim
145 words
A PROCESS FOR THE MANUFACTURE OF A MODIFIED POLYVINYL ALCOHOL WHICH COMPRISES SUBJECTING A COPOLYMER OF COMPONENTS CONSISTING ESSENTIALLY OF (1) A VINYL ESTER OF A SATURATED CARBOXYLIC ACID CONTAINING 1 TO 18 CARBON ATOMS AND (2) FROM 0.1 TO 20 PERCENT BY WEIGHT, BASED ON TOTAL MONOMERS, OF AN ALKENYL PHOSPHONIC ACID DIALKYL ESTER, THE ALKENYL GROUPS OF WHICH CONTAIN 2 TO 3 CARBON ATOMS AND THE ALKYL GROUPS OF WHICH CONTAIN 1 TO 18 CARBON ATOMS, TO ALCOHOLYSIS IN THE PRESENCE OF AN ALCOHOLYSIS CATALYST, AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 15 TO 90*C., WITH METHANOL IN THE PRESENCE OF 0 TO 15 PERCENT WATER, CALCULATED ON THE WEIGHT OF THE XXX, WHILE DISSOLVED IN SAID METHANOL UNIT A XXX IS OBTAINED IN WHICH AT LEAST 80 PERCENT OF THE XXX OF SAID COMPONENT (1) ARE ALCOHOLIZED INTO VINYL ALCOHOL GROUPS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |