US4459385A
Expired / Lapsed
US
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Propylene polymer compositions
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1982-11-26
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Granted: 1984-07-10
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Expires: 2002-11-26
Abstract
Abstract Extruded or molded shapes of compositions consisting essentially of certain sequentially polymerized ethylene-propylene copolymers and linear low density polyethylene of relatively low melt index (ASTM D1238-Condition E), not exceeding 5 dg/min, and density not exceeding 0.928, possess extremely good impact resistance without excessive loss of stiffness.
Inventors
- 👤 J. Douglas McCullough, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:48
CPC Classifications
C; C08; C08L; C08L53/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
140 words
A high impact polyolefin composition consisting essentially of a binary polymer blend of (i) 75-85% by weight of an impact-modified propylene polymer which has a melt flow of (ASTM D1238-Condition L) of about 1-50 dg/min and an elastomeric propylene-ethylene copolymer content of 5-50% by weight, the copolymer fraction having an ethylene content of 30-95% by weight, which is the product of sequential polymerization of propylene and a propylene-ethylene mixture over a titanium halide-containing coordination catalyst and (ii) 15-25% by weight of a linear low density ethylene copolymer which is the product of polymerization of ethylene with up to 15 mole percent of at least one C 3 -C 8 alpha olefin monomer over a transition metal-based coordination catalyst and which has a density in the range from 0.917 to 0.921 and a melt index (ASTM D1238-Condition E) not exceeding 5.
Claim 2
Dependent Claim
140 words
A high impact polyolefin composition consisting essentially of a binary polymer blend of (i) 75-85% by weight of an impact-modified propylene polymer which has a melt flow of (ASTM D1238-Condition L) of about 1-50 dg/min and an elastomeric propylene-ethylene copolymer content of 5-50% by weight, the copolymer fraction having an ethylene content of 30-95% by weight, which is the product of sequential polymerization of propylene and a propylene-ethylene mixture over a titanium halide-containing coordination catalyst and (ii) 15-25% by weight of a linear low density ethylene copolymer which is the product of polymerization of ethylene with up to 15 mole percent of at least one C 3 -C 8 alpha olefin monomer over a transition metal-based coordination catalyst and which has a density in the range from 0.917 to 0.921 and a melt index (ASTM D1238-Condition E) not exceeding 5.
Claim 3
Dependent Claim
42 words
The composition according to claim 1, wherein the proportion of propylene-ethylene copolymer fraction thereof is 5-20% by weight; the ethylene content of said fraction is 40-70% by weight; and the melt index of the ethylene copolymer is not in excess of 3.
Claim 4
Dependent Claim
134 words
A high impact polyolefin composition consisting essentially of a binary polymer blend of (i) 75-85% by weight of an impact-modified propylene polymer which has a melt flow of about 1-50 dg/min and an elastomeric propylene-ethylene copolymer content of 8-15% by weight, the copolymer fraction having an ethylene content of 45-65% by weight, and which is the product of sequential polymerization of propylene and a propylene-ethylene mixture over a titanium halide-containing coordination catalyst and (ii) 15-25% by weight of a linear low density ethylene copolymer which is the product of polymerization of ethylene with up to 10 mole percent of at least one C 3 -C 8 alpha olefin monomer over a transition metal-based coordination catalyst and which has a density in the range from 0.912 to 0.921 and a melt index not exceeding 1.0.
Claim 5
Dependent Claim
134 words
A high impact polyolefin composition consisting essentially of a binary polymer blend of (i) 75-85% by weight of an impact-modified propylene polymer which has a melt flow of about 1-50 dg/min and an elastomeric propylene-ethylene copolymer content of 8-15% by weight, the copolymer fraction having an ethylene content of 45-65% by weight, and which is the product of sequential polymerization of propylene and a propylene-ethylene mixture over a titanium halide-containing coordination catalyst and (ii) 15-25% by weight of a linear low density ethylene copolymer which is the product of polymerization of ethylene with up to 10 mole percent of at least one C 3 -C 8 alpha olefin monomer over a transition metal-based coordination catalyst and which has a density in the range from 0.912 to 0.921 and a melt index not exceeding 1.0.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |