US4539369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing poly (vinyl acetals)
Assignee: ConocoPhillips Co
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Filing: 1984-07-30
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Granted: 1985-09-03
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Expires: 2004-07-30
Abstract
Abstract An improved method for the production of poly (vinyl acetals) using no added catalyst comprises mixing poly (vinyl alcohol) and an excess amount of aldehyde to produce poly (vinyl acetals), wherein the reaction is driven by removal of water in the form of an aldehyde-water azeotrope.
Inventors
- 👤 Louis R. Duckwall, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:21
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A catalyst free method for the production of poly (vinyl acetals) comprising contacting poly (vinyl alcohol) with a stoichiometric excess of at least one aldehyde containing from 1 to 6 carbon atoms in a liquid state at a temperature from about 60° C. to about 150° C. and pressure from about 1 to 15 atmospheres to carry out a condensation reaction to produce poly (vinyl acetal) and water, wherein the reaction proceeds by removing aldehydes and water as an aldehyde-water azeotrope until the reaction is completed.
Claim 2
Dependent Claim
86 words
A catalyst free method for the production of poly (vinyl acetals) comprising contacting poly (vinyl alcohol) with a stoichiometric excess of at least one aldehyde containing from 1 to 6 carbon atoms in a liquid state at a temperature from about 60° C. to about 150° C. and pressure from about 1 to 15 atmospheres to carry out a condensation reaction to produce poly (vinyl acetal) and water, wherein the reaction proceeds by removing aldehydes and water as an aldehyde-water azeotrope until the reaction is completed.
Claim 3
Dependent Claim
20 words
A process as described in claim 1 wherein the aldehydes are linear-aliphatic aldehydes containing from 1 to 3 carbcn atoms.
Claim 4
Dependent Claim
19 words
A process as described in claim 2 when carried out at a temperature from 60° C. to 100° C.
Claim 5
Dependent Claim
22 words
A process as described in claim 3 when carried out using at least a 5 to 1 aldehyde poly (vinyl alcohol) excess.
References Cited (Backward Citations)
US2143228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |