US3309422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing interpolymers of styrene and rubbery diolefin polymers
Assignee: Dart Industries Inc
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Filing: 1963-09-03
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Granted: 1967-03-14
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Expires: 1983-09-03
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Doak
- 👤 Frederick E Carrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:50
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08F279/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS FOR PREPARING AN INTERPOLYER WHICH COMPRISES THE STEPS OF PREPOLYMERIZING A REACTION MIXTURE COMPRISING STYRENE AND A RUBBERY POLYMER OF A CONJUGATED DIOLEFIN TO FROM ABOUT 10 TO 45% CONVERSION, SUSPENDING THE RESULTING REACTION PRODUCT MIXTURE IN AN AQUEOUS MEDIUM CONTAINING A SUSPENSION STABLIZER, POLYMERIZING TO SUBSTANTIAL COMPLETION, AND RECOVERING INTERPOLYMER BEADS FROM SAID SUSPENSION, THE IMPROVEMENT WHICH COMPRISES EMPLOYING CYCLOHEXANONE PEROXIDE AS A PREPOLYMERIZATION INITIATOR AND AN INITIATOR SELECTED FROM THE GROUP CONSISTING OF T-BUTYL PERBENZOATE, DICUMYL PEROXIDE AND T-BUTYL PERACETATE IN THE AQUEOUS MEDIUM.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR PREPARING AN INTERPOLYER WHICH COMPRISES THE STEPS OF PREPOLYMERIZING A REACTION MIXTURE COMPRISING STYRENE AND A RUBBERY POLYMER OF A CONJUGATED DIOLEFIN TO FROM ABOUT 10 TO 45% CONVERSION, SUSPENDING THE RESULTING REACTION PRODUCT MIXTURE IN AN AQUEOUS MEDIUM CONTAINING A SUSPENSION STABLIZER, POLYMERIZING TO SUBSTANTIAL COMPLETION, AND RECOVERING INTERPOLYMER BEADS FROM SAID SUSPENSION, THE IMPROVEMENT WHICH COMPRISES EMPLOYING CYCLOHEXANONE PEROXIDE AS A PREPOLYMERIZATION INITIATOR AND AN INITIATOR SELECTED FROM THE GROUP CONSISTING OF T-BUTYL PERBENZOATE, DICUMYL PEROXIDE AND T-BUTYL PERACETATE IN THE AQUEOUS MEDIUM.
References Cited (Backward Citations)
US3047534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |