US2634284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of organosiloxanes
Assignee: Dow Silicones Corp
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Filing: 1951-12-29
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Granted: 1953-04-07
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Expires: 1971-12-29
Abstract
No abstract record available.
Inventors
- 👤 James F Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:00
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
THE METHOD OF POLYMERIZING AN ORGANOSILOXANE WHICH COMPRISES CONTACTING AN ORGANOSILOXANE HAVING FROM 1.99 TO 2.1 HYDROCARBON RADICALS PER SILICON ATOM, SAID RADICALS BEING SELECTED FROM THE GROUP CONSISTING OF ALKYL, MONOCYCLICARYL, HALOGENATED PHENYL AND SILICONEOPENTYL RADICALS, WITH AN ALKALINE MATERIAL HAVING A PH OF AT LEAST 12 WHEN MEASURED IN AN AQUEOUS SOLUTION AT A CONCENTRATION NOT GREATER THAN 0.1 N, SAID ALKALINE MATERIAL BEING PRESENT IN AMOUNT OF FROM 1 MOLECULE OF ALKALI PER 25 SILICON ATOMS TO 1 MOLECULE OF ALKALI PER 30,000 SILICON ATOMS, IN THE PRESENCE OF AT LEAST 1 PER CENT BY WEIGHT BASED UPON THE WEIGHT OF THE SILOXANE OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALKYL NITRILES HAVING FROM 2 TO 5 CARBON ATOMS PER MOLECULE, MONOCYCLICARYL NITRILES HAVING FROM 7 TO 10 CARBON ATOMS PER MOLECULE AND AMIDES OF THE FORMULA RCONR''2 WHERE R IS SELECTED FROM THE GROUP CONSISTING OF HYDROEN ATOMS AND METHYL RADICALS AND R'' IS AN ALKYL RADICAL OF LESS THAN 4 CARBON ATOMS, UNTIL AN INCREASE IN THE DEGREE OF POLYMERIZATION OF THE ORGANOSILOXANE IS OBTAINED.
Claim 2
Independent Claim
182 words
THE METHOD OF POLYMERIZING AN ORGANOSILOXANE WHICH COMPRISES CONTACTING AN ORGANOSILOXANE HAVING FROM 1.99 TO 2.1 HYDROCARBON RADICALS PER SILICON ATOM, SAID RADICALS BEING SELECTED FROM THE GROUP CONSISTING OF ALKYL, MONOCYCLICARYL, HALOGENATED PHENYL AND SILICONEOPENTYL RADICALS, WITH AN ALKALINE MATERIAL HAVING A PH OF AT LEAST 12 WHEN MEASURED IN AN AQUEOUS SOLUTION AT A CONCENTRATION NOT GREATER THAN 0.1 N, SAID ALKALINE MATERIAL BEING PRESENT IN AMOUNT OF FROM 1 MOLECULE OF ALKALI PER 25 SILICON ATOMS TO 1 MOLECULE OF ALKALI PER 30,000 SILICON ATOMS, IN THE PRESENCE OF AT LEAST 1 PER CENT BY WEIGHT BASED UPON THE WEIGHT OF THE SILOXANE OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF ALKYL NITRILES HAVING FROM 2 TO 5 CARBON ATOMS PER MOLECULE, MONOCYCLICARYL NITRILES HAVING FROM 7 TO 10 CARBON ATOMS PER MOLECULE AND AMIDES OF THE FORMULA RCONR''2 WHERE R IS SELECTED FROM THE GROUP CONSISTING OF HYDROEN ATOMS AND METHYL RADICALS AND R'' IS AN ALKYL RADICAL OF LESS THAN 4 CARBON ATOMS, UNTIL AN INCREASE IN THE DEGREE OF POLYMERIZATION OF THE ORGANOSILOXANE IS OBTAINED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |