Patent US2875185A successfully refreshed from Google Patents.
US2875185A
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Method of polymerizing a monoethylenically unsaturated vinylidene compound in aqueous suspension
Assignee: Dow Chemical Co
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Filing: 1954-08-23
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Granted: 1959-02-24
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Expires: 1974-08-23
Abstract
No abstract record available.
Inventors
- 👤 Ralph M Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:32
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F2/24; C08F2/18; C08F2/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
120 words
THE METHOD WHICH CONSISTS ESSENTIALLY IN DISPERSING BY MEANS OF AGITATION AT LEAST ONE WATER-IMMISCIBLE MONOETHYLENICALLY UNSATURATED MONOMERIC VINYLIDENE COMPOUND IN AN AQUEOUS MEDIUM CONTAINING A HYDROPHILIC COLLOIDAL GRANULATING AGENT, UNDER CONDITIONS OF AGITATION TO FORM MONOMER DROPLETS OF THE DESIRED SIZE, THICKENING THE DISPERSION BY DISSOLVING IN THE AQUEOUS PHASE THEREOF A CARBOHYDRATE FROM THE GROUP CONSISTING OF LOCUST BEAN GUM, GUAR GUM AND POTATO STARCH IN AMOUNT SUFFICIENT TO PREVENT GRAVITATIONAL SEPARATION OF THE DISPERSED PHASE FROM THE CONTINUOUS AQUEOUSE PHASE, DISCONTINUING DISPERSIVE AGITATION AND SUBJECTING THE DISPERSION TO THE ACTION OF CATALYTIC AND THERMAL CONDITIONS KNOWN TO INDUCE POLYMERIZATION OF THE MONOMER, WHILE AVOIDING TURBULENCE IN THE THICKENED DISPERSION, THEREBY TO PRODUCE UNIFORM BEADS OF THE POLYMER.
Claim 2
Independent Claim
120 words
THE METHOD WHICH CONSISTS ESSENTIALLY IN DISPERSING BY MEANS OF AGITATION AT LEAST ONE WATER-IMMISCIBLE MONOETHYLENICALLY UNSATURATED MONOMERIC VINYLIDENE COMPOUND IN AN AQUEOUS MEDIUM CONTAINING A HYDROPHILIC COLLOIDAL GRANULATING AGENT, UNDER CONDITIONS OF AGITATION TO FORM MONOMER DROPLETS OF THE DESIRED SIZE, THICKENING THE DISPERSION BY DISSOLVING IN THE AQUEOUS PHASE THEREOF A CARBOHYDRATE FROM THE GROUP CONSISTING OF LOCUST BEAN GUM, GUAR GUM AND POTATO STARCH IN AMOUNT SUFFICIENT TO PREVENT GRAVITATIONAL SEPARATION OF THE DISPERSED PHASE FROM THE CONTINUOUS AQUEOUSE PHASE, DISCONTINUING DISPERSIVE AGITATION AND SUBJECTING THE DISPERSION TO THE ACTION OF CATALYTIC AND THERMAL CONDITIONS KNOWN TO INDUCE POLYMERIZATION OF THE MONOMER, WHILE AVOIDING TURBULENCE IN THE THICKENED DISPERSION, THEREBY TO PRODUCE UNIFORM BEADS OF THE POLYMER.
Claim 3
Dependent Claim
12 words
THE METHOD CLAIMED IN CLAIM 1. WHEREIN THE MONOMER COMPRISES VINYLIDENE CHLORIDE.
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) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |