Patent US3139414A successfully refreshed from Google Patents.
US3139414A
Expired / Lapsed
US
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Method of preventing discoloration of olefin polymers by catalyst residues, and the resulting polymeric composition
Assignee: Montedison SpA
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Filing: 1957-12-05
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Granted: 1964-06-30
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Expires: 1977-12-05
Abstract
No abstract record available.
Inventors
- 👤 Ranalli Franco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:55
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08K5/13; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/10; C08L71/00; C08L71/02; C08L71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
THE METHOD OF PREVENTING DARKENING OF POLYMERIC OLEFINIC HYDROCARBONS WHICH ARE SOLID AT NORMAL TEMPERATURES, AND PRODUCED WITH THE AID OF CATALYSTS PREPARED FROM HALIDES OF TRANSITION METALS OF GROUPS IV TO VI INCLUSIVE OF THE MENDELEEFF PERIODIC TABLE AND ORGANOMETALLIC COMPOUNDS OF ELEMENTS OF GROUPS I TO III INCLUSIVE OF SAID TABLE, BY RESIDUES OF THE CATALYSTS PRESENT THEREIN AND WHICH RESIDUES EVOLVE HYDROCHLORIC ACID WHEN THE POLYMER ARE HEATED TO FUSION TEMPERATURE, AND OF PREVENTING CORROSION OF THE METAL PARTS OF APPARATUS IN WHICH THE HOT POLYMER IS PROCESSED, WHICH METHOD COMPRISES INCORPORATING IN THE POLYMERIC OLEFINIC HYDROCARBON, PRIOR TO HEATING THE SAME TO A TEMPERATURE AT WHICH THE ACID IS EVOLVED, 0.1-1% BY WEIGHT OF A FIXATIVE FOR THE HYDROCHOLORIC ACID WHICH FIXATIVE IS COMPATIBLE WITH THE POLYMER, STABLE AT THE TEMPERATURE AT WHICH THE POLYMER IS PROCESSED, AND SELECTED FROM THE GROUP CONSISTING OF EPICHLOROHYDRIN-DIPHENYLOLPROPANE RESIN, BASIC LEAD PHOSPHITE, AND MIXTURES OF THE RESIN AND PHOSPHITE.
Claim 2
Independent Claim
160 words
THE METHOD OF PREVENTING DARKENING OF POLYMERIC OLEFINIC HYDROCARBONS WHICH ARE SOLID AT NORMAL TEMPERATURES, AND PRODUCED WITH THE AID OF CATALYSTS PREPARED FROM HALIDES OF TRANSITION METALS OF GROUPS IV TO VI INCLUSIVE OF THE MENDELEEFF PERIODIC TABLE AND ORGANOMETALLIC COMPOUNDS OF ELEMENTS OF GROUPS I TO III INCLUSIVE OF SAID TABLE, BY RESIDUES OF THE CATALYSTS PRESENT THEREIN AND WHICH RESIDUES EVOLVE HYDROCHLORIC ACID WHEN THE POLYMER ARE HEATED TO FUSION TEMPERATURE, AND OF PREVENTING CORROSION OF THE METAL PARTS OF APPARATUS IN WHICH THE HOT POLYMER IS PROCESSED, WHICH METHOD COMPRISES INCORPORATING IN THE POLYMERIC OLEFINIC HYDROCARBON, PRIOR TO HEATING THE SAME TO A TEMPERATURE AT WHICH THE ACID IS EVOLVED, 0.1-1% BY WEIGHT OF A FIXATIVE FOR THE HYDROCHOLORIC ACID WHICH FIXATIVE IS COMPATIBLE WITH THE POLYMER, STABLE AT THE TEMPERATURE AT WHICH THE POLYMER IS PROCESSED, AND SELECTED FROM THE GROUP CONSISTING OF EPICHLOROHYDRIN-DIPHENYLOLPROPANE RESIN, BASIC LEAD PHOSPHITE, AND MIXTURES OF THE RESIN AND PHOSPHITE.
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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |