US3141870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterogeneous copolymers of ethylene-acrylic esters
Assignee: Monsanto Co
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Filing: 1961-01-03
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Granted: 1964-07-21
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Expires: 1981-01-03
Abstract
No abstract record available.
Inventors
- 👤 Oliver De S Deex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:16
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
THE METHOD OF PREPARING HETROGENEOUS COPOLYMERS OF ETHYLENE WHICH COMPRISES CONTINUOUSLY POLYMERIZING A MIXTURE CONSISTING OF ETHYLENE AND A VINYL ESTER SELECTED FROM THE GROUP CONSISTING OF METHYL ACRYLATE AND METHYL METHACRYLATE IN A TUBULAR REACTOR WITH A FREE RADICAL CATALYST AT A TEMPERATURE OF 150 TO 250*C. UNDER A PRESSURE OF 20,000 TO 40,000 P.S.I., THE SAID VINYL ESTER CALCULATED AS METHYL METHACRYLATE, CONSTITUTING 6% TO 20% BY WEIGHT OF THE TOTAL MONOMER FEED, A TIME SUFFICIENT TO CONVERT AT LEAST 20% BY WEIGHT OF THE MONOMER MIXTURE TO POLYMER, THE RESULTING HETEROGENEOUS COPOLYMER BEING CHARACTERIZED BY BEING SUBSTANTIALLY CRYSTALLINE AND HAVING A SHARP MELTING POINT ABOVE 110*C. AND A BRITTLE TEMPERATURE NO HIGHER THAN -20*C., AND THE SAID VINYL ESTER CONTENT, CALCULATED AS METHYL METHACRYLATE, OF THE COPOLYMER BEING IN THE RANGE OF 6 TO 25% BY WEIGHT.
Claim 2
Independent Claim
140 words
THE METHOD OF PREPARING HETROGENEOUS COPOLYMERS OF ETHYLENE WHICH COMPRISES CONTINUOUSLY POLYMERIZING A MIXTURE CONSISTING OF ETHYLENE AND A VINYL ESTER SELECTED FROM THE GROUP CONSISTING OF METHYL ACRYLATE AND METHYL METHACRYLATE IN A TUBULAR REACTOR WITH A FREE RADICAL CATALYST AT A TEMPERATURE OF 150 TO 250*C. UNDER A PRESSURE OF 20,000 TO 40,000 P.S.I., THE SAID VINYL ESTER CALCULATED AS METHYL METHACRYLATE, CONSTITUTING 6% TO 20% BY WEIGHT OF THE TOTAL MONOMER FEED, A TIME SUFFICIENT TO CONVERT AT LEAST 20% BY WEIGHT OF THE MONOMER MIXTURE TO POLYMER, THE RESULTING HETEROGENEOUS COPOLYMER BEING CHARACTERIZED BY BEING SUBSTANTIALLY CRYSTALLINE AND HAVING A SHARP MELTING POINT ABOVE 110*C. AND A BRITTLE TEMPERATURE NO HIGHER THAN -20*C., AND THE SAID VINYL ESTER CONTENT, CALCULATED AS METHYL METHACRYLATE, OF THE COPOLYMER BEING IN THE RANGE OF 6 TO 25% BY WEIGHT.
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) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |