US3135723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for copolymerizing alpha-methyl styrene and methyl methacrylate
Assignee: Avantor Performance Materials LLC
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Filing: 1960-08-19
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Granted: 1964-06-02
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Expires: 1980-08-19
Abstract
No abstract record available.
Inventors
- 👤 Jan E Vandegaer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:43
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
A METHOD OF PREPARING COPOLYMERS OF ALPHA-METHYLSTYRENE AND METHYL METHACRYLATE OF INCREASED FLOW RATE WHEN EXTRUDED AT 475*F. WHICH COMPRISES HEATING A MIXTURE CONSISTING ESSENTIALLY OF 15 TO 35 PARTS BY WEIGHT OF ALPHA-METHYLSTYRENE AND 65 TO 85 PARTS BY WEIGHT OF METHYL METHACRYLATE AS THE COPOLYMER PAIR WITH 0.1 TO 0.5 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE MONOMERS OF A PLURALITY OF FREE RADICAL INITIATING POLYMERIZATION CATAYLSTS, THE HEATING BEING CHARACTERIZED BY A SLOW RISE FROM AMBIENT TEMPERATURE TO 90*C., A MAJOR HEATING PERIOD OF AT LEAST FORTY HOURS WITHIN THE RANGE 90*C. TO 100*C. DURING WHICH TIME MONOMERS ARE SUBSTANTIALLY POLYMERIZED TO AN INTRINSIC VISCOSITY OF AT LEAST 0.25 WHEN MEASURED IN DIOXANE, FOLLOWED BY HEATING AT HIGHER TEMPERTURES UP TO NOT MORE THAN 150*C. OVER A MINOR PERIOD OF THE TOTAL POLYMERIZATION CYCLE WHEREBY THE POLYMERIZATION IS COMPLETED, THE SAID FREE RADICAL INITIATING CATALYSTS COMPRISING A MAJOR AMOUNT OF ONE HAVING A HALF LIFE OF TEN HOURS WITHIN THE TEMPERATURE RANGE 80*C. TO 110*C. AND LESS THAN 0.1 PERCENT BY WEIGHT OF A CATALYST HAVING A HALF LIFE OF TEN HOURS BETWEEN 60*C. 75*C.
Claim 2
Independent Claim
190 words
A METHOD OF PREPARING COPOLYMERS OF ALPHA-METHYLSTYRENE AND METHYL METHACRYLATE OF INCREASED FLOW RATE WHEN EXTRUDED AT 475*F. WHICH COMPRISES HEATING A MIXTURE CONSISTING ESSENTIALLY OF 15 TO 35 PARTS BY WEIGHT OF ALPHA-METHYLSTYRENE AND 65 TO 85 PARTS BY WEIGHT OF METHYL METHACRYLATE AS THE COPOLYMER PAIR WITH 0.1 TO 0.5 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE MONOMERS OF A PLURALITY OF FREE RADICAL INITIATING POLYMERIZATION CATAYLSTS, THE HEATING BEING CHARACTERIZED BY A SLOW RISE FROM AMBIENT TEMPERATURE TO 90*C., A MAJOR HEATING PERIOD OF AT LEAST FORTY HOURS WITHIN THE RANGE 90*C. TO 100*C. DURING WHICH TIME MONOMERS ARE SUBSTANTIALLY POLYMERIZED TO AN INTRINSIC VISCOSITY OF AT LEAST 0.25 WHEN MEASURED IN DIOXANE, FOLLOWED BY HEATING AT HIGHER TEMPERTURES UP TO NOT MORE THAN 150*C. OVER A MINOR PERIOD OF THE TOTAL POLYMERIZATION CYCLE WHEREBY THE POLYMERIZATION IS COMPLETED, THE SAID FREE RADICAL INITIATING CATALYSTS COMPRISING A MAJOR AMOUNT OF ONE HAVING A HALF LIFE OF TEN HOURS WITHIN THE TEMPERATURE RANGE 80*C. TO 110*C. AND LESS THAN 0.1 PERCENT BY WEIGHT OF A CATALYST HAVING A HALF LIFE OF TEN HOURS BETWEEN 60*C. 75*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |