Patent US3888949A successfully refreshed from Google Patents.
US3888949A
Expired / Lapsed
US
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Blends of propylene-alpha-olefin copolymers and polypropylene
Assignee: EIDP Inc
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Filing: 1973-06-21
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Granted: 1975-06-10
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Expires: 1993-06-21
Abstract
Abstract Blends of stereoregular propylene- Alpha -olefin copolymers and polypropylene of similar stereoregularity characterized by melting and crystallization behavior characteristic of the stereoregular propylene sequences as well as improved injection molding characteristics.
Inventors
- 👤 Chi-Kai Shih
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:58
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/12; C08L51/00; C08L51/06; C08L53/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
AN INTIMATE POLYMER BLEND COMPRISING A. THERMOPLASTIC ELASTOMERIC COPOLYMER OF PROPYLENE AND AT LEAST ONE A-OLEFIN HAVING FROM 6 TO 20 CARBON ATOMS, THE COPOLYMER HAVING STEROREGULAR CRYSTALLINE SEQUENCES AND AMORPHOUS SEQUENCES, ABOUT FROM 10 TO 50 WEIGHT PERCENT OF THE COPOLYMER BEING DERIVED FROM THE A-OLEFIN, THE REMAINDER BEING DERIVED FROM PROPYLENE, THE COPOLYMER HAVING A MELT INDEX OF ABOUT FROM 0.01 TO 200 AT 190*C AND A CRYSTALLINITY NUMBER OF ABOUT FROM 40 TO 70; AND B. ABOUT FROM 5 TO 95%, BY WEIGHT OF THE COPOLYMER BLEND, OF POLYMER HAVING AT LEAST ONE MELTING TRANSITION ABOVE 155*C AND WHICH CONSISTS ESSENTIALLY OF SUBSTANTIALLY STEREOREGULAR POLYPROPYLENE, SAID POLYMERIC COMPONENTS (A) AND (B) HAVING PROPYLENE SEQUENCES OF SIMILAR STEREOREGULARITY.
Claim 2
Dependent Claim
120 words
AN INTIMATE POLYMER BLEND COMPRISING A. THERMOPLASTIC ELASTOMERIC COPOLYMER OF PROPYLENE AND AT LEAST ONE A-OLEFIN HAVING FROM 6 TO 20 CARBON ATOMS, THE COPOLYMER HAVING STEROREGULAR CRYSTALLINE SEQUENCES AND AMORPHOUS SEQUENCES, ABOUT FROM 10 TO 50 WEIGHT PERCENT OF THE COPOLYMER BEING DERIVED FROM THE A-OLEFIN, THE REMAINDER BEING DERIVED FROM PROPYLENE, THE COPOLYMER HAVING A MELT INDEX OF ABOUT FROM 0.01 TO 200 AT 190*C AND A CRYSTALLINITY NUMBER OF ABOUT FROM 40 TO 70; AND B. ABOUT FROM 5 TO 95%, BY WEIGHT OF THE COPOLYMER BLEND, OF POLYMER HAVING AT LEAST ONE MELTING TRANSITION ABOVE 155*C AND WHICH CONSISTS ESSENTIALLY OF SUBSTANTIALLY STEREOREGULAR POLYPROPYLENE, SAID POLYMERIC COMPONENTS (A) AND (B) HAVING PROPYLENE SEQUENCES OF SIMILAR STEREOREGULARITY.
Claim 3
Dependent Claim
17 words
A polymer blend of claim 1 wherein the Alpha -olefin of the copolymer consists essentially of hexene-1.
Claim 4
Dependent Claim
18 words
A copolymer blend of claim 1 where the Alpha -olefin component of the copolymer consists essentially of dodecene.
Claim 5
Dependent Claim
16 words
A polymer blend of claim 1 wherein component (b) consists essentially of substantially isotactic propylene homopolymer.
Claim 6
Dependent Claim
30 words
A polymer blend of claim 1 wherein said blend has a single melting temperature, components (a) and (b) are in a co-crystallized state, and component (a) is a random copolymer.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |