US3094513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid-phase polymerization process of methacrylate monomers, catalyzed by aluminum triethyl
Assignee: WR Grace and Co
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Filing: 1960-07-14
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Granted: 1963-06-18
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Expires: 1980-07-14
Abstract
No abstract record available.
Inventors
- 👤 Edward L Kropa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:26
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F20/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE PROCESS OF POLYMERIZING METHYL METHACRYLATE TO FORM ACETONE-INSOLUBLE POLYMETHYL METHACRYLATE HAVING A SOFTENING POINT IN THE RANGE 135-160*C. WHICH COMPRISES FORMING IN AN INERT ATMOSPHERE A POLYMERIZATION MIXTURE CONSISTING ESSENTIALLY OF METHYL METHACRYLATE MONOMER AND A CATALYTIC AMOUNT OF AN ALUMINUM TRIALKYL WHEREIN THE ALKYL GROUPS CONTAIN 1 TO 8 CARBON ATOMS AT A TEMPERATURE BETWEEN 0*C. AND THE FREEZING POINT OF THE MIXTURE, ADJUSTING THE TEMPERATURE OF THE MIXTURE TO BETWEEN MINUS 45*C. AND THE FREEZING POINT OF THE MIXTURE WHEREAT A SOLID PHASE IS FORMED AND THEREAFTER ADDING ADDITIONAL METHYL METHACRYLATED MONOMER INCREMENTALLY WHILE MAINTAINING SAID SOLID PHASE PRESENT.
Claim 2
Dependent Claim
102 words
THE PROCESS OF POLYMERIZING METHYL METHACRYLATE TO FORM ACETONE-INSOLUBLE POLYMETHYL METHACRYLATE HAVING A SOFTENING POINT IN THE RANGE 135-160*C. WHICH COMPRISES FORMING IN AN INERT ATMOSPHERE A POLYMERIZATION MIXTURE CONSISTING ESSENTIALLY OF METHYL METHACRYLATE MONOMER AND A CATALYTIC AMOUNT OF AN ALUMINUM TRIALKYL WHEREIN THE ALKYL GROUPS CONTAIN 1 TO 8 CARBON ATOMS AT A TEMPERATURE BETWEEN 0*C. AND THE FREEZING POINT OF THE MIXTURE, ADJUSTING THE TEMPERATURE OF THE MIXTURE TO BETWEEN MINUS 45*C. AND THE FREEZING POINT OF THE MIXTURE WHEREAT A SOLID PHASE IS FORMED AND THEREAFTER ADDING ADDITIONAL METHYL METHACRYLATED MONOMER INCREMENTALLY WHILE MAINTAINING SAID SOLID PHASE PRESENT.
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) | 1966-06-17 | 1966-12-17 | 1967-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-17 | 1970-12-17 | 1971-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-17 | 1974-12-17 | 1975-06-18 | $7700.00 | Window Closed / Lapsed |