US2587562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous emulsion polymerization process for vinyl acetate
Assignee: Shawinigan Resins Corp
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Filing: 1948-11-22
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Granted: 1952-02-26
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Expires: 1968-11-22
Abstract
No abstract record available.
Inventors
- 👤 Wilfred K Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:09
CPC Classifications
C; C08; C08F; C08F263/00; C08F263/02; C08F263/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A CONTINUOUS AQUEOUS EMULSION POLYMERIZATION PROCESS WHICH COMPRISES POLYMERIZING MONOMERIC VINYL ACETATE IN WATER IN THE WEIGHT RATIO OF VINYL ACETATE TO WATER OF BETWEEN 60:40 AND 40:60, BY CONTINUOUSLY ADDING TO A POLYMERIZATION ZONE, (1) UNEMULSIFIED VINYL ACETATE AND (2) A DISPERSION OF POLYVINYL ACETATE IN AN AQUEOUS SOLUTION OF A DISPERSING AGENT, THE MONOMER AND POLYMER BEING ADDED IN THE RATION OF 50-99 PARTS OF MONOMER FOR EVERY 50-1 PARTS OF POLYMER, POLYMERIZING THE VINYL ACETATE IN THE POLYMERIZATION ZONE AND CONTINUOUSLY WITHDRAWING THE EMULSION PRODUCT
Claim 2
Dependent Claim
88 words
A CONTINUOUS AQUEOUS EMULSION POLYMERIZATION PROCESS WHICH COMPRISES POLYMERIZING MONOMERIC VINYL ACETATE IN WATER IN THE WEIGHT RATIO OF VINYL ACETATE TO WATER OF BETWEEN 60:40 AND 40:60, BY CONTINUOUSLY ADDING TO A POLYMERIZATION ZONE, (1) UNEMULSIFIED VINYL ACETATE AND (2) A DISPERSION OF POLYVINYL ACETATE IN AN AQUEOUS SOLUTION OF A DISPERSING AGENT, THE MONOMER AND POLYMER BEING ADDED IN THE RATION OF 50-99 PARTS OF MONOMER FOR EVERY 50-1 PARTS OF POLYMER, POLYMERIZING THE VINYL ACETATE IN THE POLYMERIZATION ZONE AND CONTINUOUSLY WITHDRAWING THE EMULSION PRODUCT
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) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |