US3332920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New copolymers and articles
Assignee: Imperial Chemical Industries Ltd
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Filing: 1963-10-10
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Granted: 1967-07-25
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Expires: 1983-10-10
Abstract
No abstract record available.
Inventors
- 👤 Clark Keith Jasper
- 👤 Jones Michael Edward Benet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:14
CPC Classifications
C; C08; C08F; C08F210/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A SOLID TRANSPARENT CRYSTALLINE COPOLYMER OF 4METHYL-PENTENE-1 WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF PROPYLENE AND BUTENE-1, SAID COPOLYMER CONTAINING BETWEEN 0.5 AND 7% BY WEIGHT OF PROPYLENE MONOMER UNITS OR BETWEEN 0.5% AND 10% BE WEIGHT OF BUTENE-1 MONOMER UNITS, AND HAVING AN ASH CONTENT OF LESS THAN 0.1% BY WEIGHT, SAID BUTENE-1/4-METHYL-PENTENE-1 COPOLYMER HAVING A MELTING POINT OF ABOUT 220 TO 245*C.
Claim 2
Dependent Claim
66 words
A SOLID TRANSPARENT CRYSTALLINE COPOLYMER OF 4METHYL-PENTENE-1 WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF PROPYLENE AND BUTENE-1, SAID COPOLYMER CONTAINING BETWEEN 0.5 AND 7% BY WEIGHT OF PROPYLENE MONOMER UNITS OR BETWEEN 0.5% AND 10% BE WEIGHT OF BUTENE-1 MONOMER UNITS, AND HAVING AN ASH CONTENT OF LESS THAN 0.1% BY WEIGHT, SAID BUTENE-1/4-METHYL-PENTENE-1 COPOLYMER HAVING A MELTING POINT OF ABOUT 220 TO 245*C.
Claim 3
Dependent Claim
115 words
A PROCESS FOR THE MANUFACTURE OF A SOLID TRANSPARENT CRYSTALLINE COPOLYMER OF 4-METHYL-PENTENE-1 WITH BETWEEN 0.5 AND 7% BY WEIGHT OF PROPYLENE MONOMER UNITS OR WITH BETWEEN 0.5 AND 10% BY WEIGHT OF BUTENE-1 MONOMER UNITS, SAID PROCESS COMPRISING (A) POLYMERISING THE 4-METHYL-PENTENE-1 AND THE PROPYLENE OR BUTENE-1 ING THE 4-METHYL-PENTENE-1 AND THE PROPYLENE OR BUTENE-1 IN THE PRESENCE OF A TRIVALENT TITANIUM HALIDE/ALUMINUM DIALKYL HALIDE CATALYST IN AN INERT DILUENT TO PRODUCE A SEPARABLE SLURRY OF SAID COPOLYMER IN SAID DILUENT, AND THEREAFTER (B) SEPARATING THE COPOLYMER FROM SAID DILUENT AND (C) DE-ASHING THE COPOLYMER WITH DRY REAGENTS UNTIL THE COPOLYMER ASH CONTENT IS LESS THAN 0.1% BY WEIGHT, WHEREBY THE COPOLYMER IS TRANSPARENT.
Claim 4
Dependent Claim
115 words
A PROCESS FOR THE MANUFACTURE OF A SOLID TRANSPARENT CRYSTALLINE COPOLYMER OF 4-METHYL-PENTENE-1 WITH BETWEEN 0.5 AND 7% BY WEIGHT OF PROPYLENE MONOMER UNITS OR WITH BETWEEN 0.5 AND 10% BY WEIGHT OF BUTENE-1 MONOMER UNITS, SAID PROCESS COMPRISING (A) POLYMERISING THE 4-METHYL-PENTENE-1 AND THE PROPYLENE OR BUTENE-1 ING THE 4-METHYL-PENTENE-1 AND THE PROPYLENE OR BUTENE-1 IN THE PRESENCE OF A TRIVALENT TITANIUM HALIDE/ALUMINUM DIALKYL HALIDE CATALYST IN AN INERT DILUENT TO PRODUCE A SEPARABLE SLURRY OF SAID COPOLYMER IN SAID DILUENT, AND THEREAFTER (B) SEPARATING THE COPOLYMER FROM SAID DILUENT AND (C) DE-ASHING THE COPOLYMER WITH DRY REAGENTS UNTIL THE COPOLYMER ASH CONTENT IS LESS THAN 0.1% BY WEIGHT, WHEREBY THE COPOLYMER IS TRANSPARENT.
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) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |