US3036053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymerization of styrene and alpha-methylstyrene
Assignee: Beazer East Inc
•
Filing: 1958-02-25
•
Granted: 1962-05-22
•
Expires: 1978-02-25
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Doak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:22
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
METHOD OF MAKING STYRENE-ALPHA-METHYLSTYRENE COPOLYMERS BY SUSPENSION POLYMERIZATION BY SUSPENDING IN AN AQUEOUS MEDIUM, IN THE PRESENCE OF A SUSPENSION AGENT, A MIXTURE OF MONOMERS CONSISTING OF 95-70 PARTS STYRENE AND 5-30 PARTS ALPHA-METHYL STYRENE, CONTROLLING THE FREE RADICAL CONCENTRATION THROUGHOUT THE POLYMERIZATION TO PERMIT A SLIGHT INCREASE THEREOF AS POLYMERIZATION PROGRESSES BY ADDING TO THE MIXTURE 0.10-0.20 PARTS BY WEIGHT BASED UPON THE WEIGHT OF SAID MIXTURE OF AN ORGANIC PEROXIDE DECOMPOSING AT A TEMPERATURE OF 100125*C., HEATING THE CATALYST-CONTAINING MIXTURE IN AN INERT ATMOSPHERE AT A TEMPERATURE OF 1000-125*C. UNTIL AT LEAST ABOUT 90% CONVERSION OF MONOMER TO POLYMER HAS BEEN EFFECTED, WHEREBY A COPOLYMER HAVING AN INTRINSIC VISCOSITY OF 0.5-1.0 IS PRODUCED, AND REMOVING THE RESIDUAL MONOMER FROM THE POLYMERIZED MASS.
Claim 2
Dependent Claim
124 words
METHOD OF MAKING STYRENE-ALPHA-METHYLSTYRENE COPOLYMERS BY SUSPENSION POLYMERIZATION BY SUSPENDING IN AN AQUEOUS MEDIUM, IN THE PRESENCE OF A SUSPENSION AGENT, A MIXTURE OF MONOMERS CONSISTING OF 95-70 PARTS STYRENE AND 5-30 PARTS ALPHA-METHYL STYRENE, CONTROLLING THE FREE RADICAL CONCENTRATION THROUGHOUT THE POLYMERIZATION TO PERMIT A SLIGHT INCREASE THEREOF AS POLYMERIZATION PROGRESSES BY ADDING TO THE MIXTURE 0.10-0.20 PARTS BY WEIGHT BASED UPON THE WEIGHT OF SAID MIXTURE OF AN ORGANIC PEROXIDE DECOMPOSING AT A TEMPERATURE OF 100125*C., HEATING THE CATALYST-CONTAINING MIXTURE IN AN INERT ATMOSPHERE AT A TEMPERATURE OF 1000-125*C. UNTIL AT LEAST ABOUT 90% CONVERSION OF MONOMER TO POLYMER HAS BEEN EFFECTED, WHEREBY A COPOLYMER HAVING AN INTRINSIC VISCOSITY OF 0.5-1.0 IS PRODUCED, AND REMOVING THE RESIDUAL MONOMER FROM THE POLYMERIZED MASS.
References Cited (Backward Citations)
US2468748A
Cited
US2455342A
Cited
US2556459A
Cited
US2656334A
Cited
US2638465A
Cited
US2715118A
Cited
US2673194A
Cited
US2797209A
Cited
DE937918C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-21 | 1965-11-20 | 1966-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-21 | 1969-11-20 | 1970-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-21 | 1973-11-20 | 1974-05-22 | $7700.00 | Window Closed / Lapsed |