Patent US4413097A successfully refreshed from Google Patents.
US4413097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer compositions of LDPE and E/P copolymer
Assignee: Eneos Corp
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Filing: 1982-04-20
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Granted: 1983-11-01
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Expires: 2002-04-20
Abstract
Abstract Provided is a polymer composition having a melt index of 0.01 to 5.0 and a density of 0.870 to 0.940 prepared by blending 30 to 80 parts by weight of an ethylene/propylene copolymer having an intrinsic viscosity determined in decalin at 135° C. of 1.7 to 10 dl/g and a density not higher than 0.945 which copolymer is obtained by copolymerizing ethylene with propylene, with 70 to 20 parts by weight of a high-pressure process polyethylene having an intrinsic viscosity determined in decalin at 135° C. of not higher than 0.7 dl/g and a density of 0.915 to 0.935.
Inventors
- 👤 Kazuo Matsuura
- 👤 Noboru Yamaoka
- 👤 Shinichi Yanahashi
- 👤 Katumi Usui
- 👤 Mituji Miyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:04
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0807; C08L23/0815
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A polymer composition having a melt index of 0.01 to 5.0 and a density of 0.870 to 0.940, said polymer composition comprising a blend of: (1) 30 to 80 parts by weight of an ethylene/propylene copolymer having an intrinsic viscosity determined in decalin at 135° C. of 5.0 to 10 dl/g and a density in the range of from 0.850 to 0.930 which copolymer is obtained by copolymerizing ethylene with propylene in a substantially liquid solvent-free vapor phase condition and in the presence of a catalyst comprising a solid substance and an organoaluminum compound, said solid substance containing magnesium and titanium and/or vanadium, and (2) 70 to 20 parts by weight of a high-pressure process polyethylene having an intrinsic viscosity determined in decalin at 135° C. of not higher than 0.7 dl/g and a density of 0.915 to 0.935.
Claim 2
Dependent Claim
139 words
A polymer composition having a melt index of 0.01 to 5.0 and a density of 0.870 to 0.940, said polymer composition comprising a blend of: (1) 30 to 80 parts by weight of an ethylene/propylene copolymer having an intrinsic viscosity determined in decalin at 135° C. of 5.0 to 10 dl/g and a density in the range of from 0.850 to 0.930 which copolymer is obtained by copolymerizing ethylene with propylene in a substantially liquid solvent-free vapor phase condition and in the presence of a catalyst comprising a solid substance and an organoaluminum compound, said solid substance containing magnesium and titanium and/or vanadium, and (2) 70 to 20 parts by weight of a high-pressure process polyethylene having an intrinsic viscosity determined in decalin at 135° C. of not higher than 0.7 dl/g and a density of 0.915 to 0.935.
Claim 3
Dependent Claim
38 words
The composition as defined in claim 1, in which the content of said ethylene/propylene copolymer (1) is 35 to 75 parts by weight and that of said high-pressure process polyethylene (2) is 65 to 25 parts by weight.
Claim 4
Dependent Claim
38 words
The composition as defined in claim 1, in which the content of said ethylene/propylene copolymer (1) is 40 to 70 parts by weight and that of said high-pressure process polyethylene (2) is 60 to 30 parts by weight.
Claim 5
Dependent Claim
37 words
The composition as defined in claim 1, in which said ethylene/propylene copolymer (1) is obtained by the vapor phase polymerization using said catalyst, said catalyst being treated with an α-olefin in advance of the vapor phase polymerization.
Claim 6
Dependent Claim
16 words
A film formed from the composition as defined in any one of claims 1 to 4.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |