US3700753A
Expired / Lapsed
US
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Polymer compositions comprising polyethylene and ethylene/propylene copolymer
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1970-09-08
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Granted: 1972-10-24
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Expires: 1990-09-08
Abstract
Abstract A polymer composition consisting of 70-99.5 percent by weight of low density polyethylene having a density of 0.940 or less and 0.5-30 percent by weight of a substantially amorphous propyleneethylene copolymer having an ethylene content of 20 percent by weight or less, an intrinsic viscosity in tetralin at 135* C. in the range of 1.0-2.8 and a crystallinity of 35 percent by weight or less according to ordinary X-ray analysis. This composition improves the high speed processability of the low density polyethylene.
Inventors
- 👤 Hiroshi Terada
- 👤 Kenzo Shirayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:27
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083; C08L53/00; C09; C09D; C09D153/00; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; C08F210/00; C08F210/04; C08F210/06; C08L2203/00; C08L2203/20; C08L2203/202; C08L23/10; C08L23/14; C08L23/142; C08L2312/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
A polymer composition according to claim 1, wherein the amount of said substantially amorphous propylene-ethylene copolymer is 1 - 10 percent by weight.
Claim 2
Dependent Claim
13 words
A polymer composition according to claim 1, wherein the polymerization medium is n-heptane.
Claim 3
Dependent Claim
127 words
Electric wire coated by a polymer composition consisting essentially of (1) 70 - 99.5 percent by weight of low density polyethylene having a density of 0.940 or less and (2) 0.5 - 30 percent by weight of a substantially amorphous propylene-ethylene copolymer containing 0.05 to 0.3 percent by weight of ethylenic unsaturation and having an ethylene content of 20 percent by weight or less, an intrinsic viscosity in tetralin at 135* C in the range of 1.0 - 2.8 and a crystallinity of 35 percent by weight or less according to ordinary X-ray analysis and by-produced as a polymerization medium-soluble component in the production of crystalline propylene-ethylene block copolymer, which is composed mainly of propylene, by use of a catalyst comprising a titanium halide and an alkylaluminum.
Claim 4
Dependent Claim
17 words
Electric wire coated by a polymer composition according to claim 4, wherein the polymer composition is cross-linked.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |