US4354004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film compositions from olefin polymer blends
Assignee: Shell USA Inc
•
Filing: 1981-09-28
•
Granted: 1982-10-12
•
Expires: 2001-09-28
Abstract
Abstract A heat sealable blend of a butene-1-ethylene copolymer, about 2 to 9% by weight of polypropylene and from about 0.02 to 1.5% by weight of high density polyethylene can be processed at high line speed in the blown-bubble extrusion process to form films or sheets exhibiting improved heat sealing characteristics, processability, tear strength and other properties.
Inventors
- 👤 Patrick M. Hughes
- 👤 Ananda M. Chatterjee
- 👤 Charles C. Hwo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:04
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C09; C09J; C09J123/00; C09J123/02; C09J123/18; C09J123/20; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
A composition consisting essentially of an intimate blend of about 92 to 94% by weight of an isotactic butene-1-ethylene copolymer containing from about 0.5 to 10 mole percent ethylene, about 6 to 8% by weight of polypropylene, and about 0.02 to 1.5% by weight of high density polyethylene.
Claim 2
Dependent Claim
48 words
A composition consisting essentially of an intimate blend of about 92 to 94% by weight of an isotactic butene-1-ethylene copolymer containing from about 0.5 to 10 mole percent ethylene, about 6 to 8% by weight of polypropylene, and about 0.02 to 1.5% by weight of high density polyethylene.
Claim 3
Dependent Claim
35 words
A composition consisting essentially of an intimate blend of about 94% by weight of an isotactic butene-1-ethylene copolymer, about 6% by weight of polypropylene, and about 0.05 to 0.25% by weight of high density polyethylene.
Claim 4
Dependent Claim
35 words
A composition consisting essentially of an intimate blend of about 94% by weight of an isotactic butene-1-ethylene copolymer, about 6% by weight of polypropylene, and about 0.05 to 0.25% by weight of high density polyethylene.
Claim 5
Dependent Claim
54 words
A heat sealable blown film or sheet prepared from an intimate blend consisting essentially of about 92 to 94% by weight of an isotactic butene-1-ethylene copolymer containing from about 0.5 to 10 mole percent ethylene, about 2 to 9% by weight of polypropylene, and about 0.02 to 1.5% by weight of high density polyethylene.
Claim 6
Dependent Claim
54 words
A heat sealable blown film or sheet prepared from an intimate blend consisting essentially of about 92 to 94% by weight of an isotactic butene-1-ethylene copolymer containing from about 0.5 to 10 mole percent ethylene, about 2 to 9% by weight of polypropylene, and about 0.02 to 1.5% by weight of high density polyethylene.
Claim 7
Dependent Claim
41 words
A heat sealable blown film or sheet prepared from an intimate blend consisting essentially of about 94% by weight of an isotactic butene-1-ethylene copolymer, about 6% by weight of polypropylene and about 0.05 to 0.25% by weight of high density polyethylene.
Claim 8
Dependent Claim
41 words
A heat sealable blown film or sheet prepared from an intimate blend consisting essentially of about 94% by weight of an isotactic butene-1-ethylene copolymer, about 6% by weight of polypropylene and about 0.05 to 0.25% by weight of high density polyethylene.
Claim 9
Dependent Claim
36 words
A composition according to claim 1, prepared by blending the polyethylene component with the major portion of the composition in the form of a masterbatch of said polyethylene in said copolymer or in isotactic butene-1 homopolymer.
Claim 10
Dependent Claim
36 words
A composition according to claim 2, prepared by blending the polyethylene component with the major portion of the composition in the form of a masterbatch of said polyethylene in said copolymer or in isotactic butene-1 homopolymer.
References Cited (Backward Citations)
US3808304A
Cited
US3440208A
Cited
BE695803A
Cited
US3634553A
Cited
US3634552A
Cited
US3634551A
Cited
US3684760A
Cited
US3836607A
Cited
US4075290A
Cited
US4136501A
Cited
US4169910A
Cited
US4316970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |