US3700622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of rubber modified styrene-acrylonitrile polymers
Assignee: Wyeth Holdings LLC
•
Filing: 1970-12-21
•
Granted: 1972-10-24
•
Expires: 1990-12-21
Abstract
Abstract A PROCESS FOR THE CONTINUOUS PRODUCTION OF RUBBER MODIFIED STYRENE-ACRYLONITRILE POLYMERS WHEREIN STYRENE AND ACRYLONITRILE ARE COPOLYMERIZED IN THE PRESENCE OF AN INERT ORGANIC SOLVENT AND IN AT LEAST TWO STAGES OF POLYMERIZATION, THE RESULTANT COPOLYMER IS CHARGED WITH A GRAFTED POLYBUTADIENE LATEX TO A SHEARING ZONE AT A SPECIFIC TEMPERATURE, PRESSURE AND TIME SO AS TO PRODUCE A UNIFORM COMPOSITION HAVING BOTH A MICROSCOPIC AND MACROSCOPIC DISPERSION OF INGREDIENTS AND THE RESULTANT DISPERSION IS DEVOLATILIZED AND EXTRUDED UNDER SPECIFIC CONDITIONS, AND COMPOSITIONS OF SAID INGREDIENTS, ARE DISCLOSED.
Inventors
- 👤 Joseph Francis Terenzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:01
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/10; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |