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US3294725A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of polymerizing siloxanes and silcarbanes in emulsion by using a surface active sulfonic acid catalyst

Assignee: Dow Silicones Corp
•
Filing: 1965-09-13
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Granted: 1966-12-27
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Expires: 1985-09-13
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Abstract

No abstract record available.

Inventors

  • 👤 Donald E Findlay
  • 👤 Donald R Weyenberg

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 04:10
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12; C08G75/00; C08G75/02; C08G75/06; C08G75/08; C08G77/00; C08G77/04; C08G77/06; C08G77/08; C08G77/48; C08G77/50; D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H19/32

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 10 words
AN AQUEOUS EMULSION OF A POLYMER CONTAINING THE UNIT FORMULA
Claim 2
Independent Claim 261 words
A METHOD WHICH COMPRISES POLYMERIZING AND COPOLYMERIXING (1) AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF ORGANOSILOXANES OF THE UNIT FORMULA RNSIO4-N/2 IN WHICH R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN ATOMS, MONOVALENT HYDROCARBON RADICALS AND MONOVALENT HALOHYDROCARBON RADICALS AND N HAS AN AVERAGE VALUE OF FROM 0.5 TO LESS THAN 3, AND SILCARBANES HAVING THE GENERAL FORMULA HO(R)2SIQSI(R)2OH WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN ATOMS, MONOVALENT HYDROCARBON RADICALS AND MONOVALENT HALOHYDROCARBON RADICALS AND Q IS A DIVALENT RADICAL ATTACHED TO BOTH SILICON ATOMS VIA A SILICON-CARBON BOND, SAID Q BEING SELECTED FROM THE GROUP CONSISTING OF RADICALS COMPOSED OF CARBON AND HYDROGEN ATOMS AND RADICALS COMPOSED OF CARBON, HYDROGEN AND OXYGEN ATOMS, THERE BEING LESS THAN 15 CARBON ATOMS IN SAID Q RADICAL AND ANY OXYGEN THAT IS PRESENT BEING IN THE FORM OF ETHER LINKAGES, BY POLYMERIZING SAID MEMBER IN AN AQUEOUS MEDIUM WHILE IN A DISPERSED STATE IN THE PRESENCE OF (2) A SURFACE ACTIVE SULFONIC ACID SELECTED FROM THE GROUP CONSISTING OF THE ALIPHATICALLY SUBSTITUTED BENZENE-SULFONIC ACID CONTAINING AT LEAST SIX CARBON ATOMS IN THE ALIPHATIC SUBSTITUENTS, THE ALIPHATICALLY SUBSTITUTED NAPTHALENSULFONIC ACIDS CONTAINING AT LEAST FOUR CARBON ATOMS IN THE ALIPHATIC SUBSTITUENTS, THE ALIPHATIC SULFONIC ACIDS CONTAINING AT LEAST SIX CARBON ATOMS IN THE ALIPHATIC SUBSTITUENT, THE SILYLALKYLSULFONIC ACIDS CONTAINING AT LEAST SIX CARBON ATOMS IN THE ALKYL SUBSTITUENTS, AND THE ALIPHATICALLY SUBSTITUTED DIPHENYLETHERSULFONIC ACIDS CONTAINING AT LEAST SIX CARBON ATOMS IN THE ALIPHTIC SUBSTITUENTS, AS THE PRIMARY POLYMERIZATION CATALYST, UNTIL THE DESIRED INCREASE IN MOLECULAR AGGREGATION IS OBTAINED.

References Cited (Backward Citations)

US2562000A Cited
US2567854A Cited
GB665479A Cited
US2891920A Cited
US3175993A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1969-12-26 1970-06-27 1970-12-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1973-12-26 1974-06-27 1974-12-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1977-12-26 1978-06-27 1978-12-27 $7700.00 Window Closed / Lapsed

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