US4367841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic carrying bag with binary polyolefin resin blend
Assignee: Pactiv LLC
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Filing: 1980-11-18
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Granted: 1983-01-11
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Expires: 2000-11-18
Abstract
Abstract Blended polyolefin resins containing linear low density polyethylene copolymers (LLDPE) are disclosed for making seamless-wall handled strap bags from thin tubular monolayer film consisting essentially of a homogeneous binary blend of resins. The improved resin blend system employed in this invention contains a predominant amount of highly-branched low density polyethylene structure. A minor amount of LLDPE constitutes the other resinous component, preferably in the amount of 10 to 40 parts by weight per 100 parts of polyolefin resin. The LLDPE resin may comprise a copolymer of ethylene with at least one alpha-olefin having 4 to 12 carbon atoms, and having a density less than 0.94.
Inventors
- 👤 Ranjit Mazumdar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:50
CPC Classifications
B; B65; B65D; B65D33/00; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0807; C08L23/0815; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1345; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
An undershirt-type handle strap carrying bag formed of a thin polyolefin film consisting of a homogeneous binary blend of hydrocarbon resins, said resin blend containing: a. 10 to 40 wt. % linear low density copolymer of ethylene with 1 to 10 wt. % alpha-olefin having 4 to 8 carbon atoms, and having a melt index of 0.2 to 2; and b. 60 to 90 wt. % highly branched low density ethylene homopolymer having a fractional melt index of 0.5 to 0.9.
Claim 2
Dependent Claim
81 words
An undershirt-type handle strap carrying bag formed of a thin polyolefin film consisting of a homogeneous binary blend of hydrocarbon resins, said resin blend containing: a. 10 to 40 wt. % linear low density copolymer of ethylene with 1 to 10 wt. % alpha-olefin having 4 to 8 carbon atoms, and having a melt index of 0.2 to 2; and b. 60 to 90 wt. % highly branched low density ethylene homopolymer having a fractional melt index of 0.5 to 0.9.
Claim 3
Dependent Claim
35 words
The bag of claim 1 wherein said hydrocarbon resin blend contains about 20 wt. % linear low density copolymer having a specific gravity 0.915 to 0.94 and about 80 wt. % branched low density homopolymer.
Claim 4
Dependent Claim
16 words
The bag of claim 1 wherein the bag is constructed of single layer uniformly thick film.
Claim 5
Dependent Claim
18 words
The bag of claim 1 wherein said film has an average gauge of about 1.75 mils or less.
Claim 6
Dependent Claim
127 words
In a thermoplastic polyolefin bag wherein a uniform tubular film is folded to form side pleats, heat sealed to form a transverse bottom portion and sealed at opposing portions adjacent to a central cutout to form a pair of integral handles, an improved polyolefin binary blend film consisting essentially of: 60 to 90 weight % of a highly branched polyethylene having a density less than 0.930 g/cc and a fractional melt index range of from about 0.5-0.9; and 10 to 40 weight % of a linear low density copolymer of ethylene with from about 1 to 10 weight % of an alpha olefin of 4 to 12 carbon atoms having a density less than about 0.940 g/cc and a melt index of from about 0.2 to 2.
Claim 7
Dependent Claim
127 words
In a thermoplastic polyolefin bag wherein a uniform tubular film is folded to form side pleats, heat sealed to form a transverse bottom portion and sealed at opposing portions adjacent to a central cutout to form a pair of integral handles, an improved polyolefin binary blend film consisting essentially of: 60 to 90 weight % of a highly branched polyethylene having a density less than 0.930 g/cc and a fractional melt index range of from about 0.5-0.9; and 10 to 40 weight % of a linear low density copolymer of ethylene with from about 1 to 10 weight % of an alpha olefin of 4 to 12 carbon atoms having a density less than about 0.940 g/cc and a melt index of from about 0.2 to 2.
Claim 8
Dependent Claim
18 words
The bag of claim 5 wherein said film has an average gauge of about 1.75 mils or less.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |