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US4430457A
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Cling/stretch wrap compositions
Assignee: Cities Service Co
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Filing: 1982-05-10
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Granted: 1984-02-07
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Expires: 2002-05-10
Abstract
Abstract A cling/stretch wrap film having desirable processing and end use characteristics is made from a composition of 90-97.5 wt. % an ethylene polymer having a melt flow value between 0.2 to 6.0 such as EVA copolymer (4-5 wt. % VA content) and 2.5-10 wt. % low density amorphous copolymer of ethylene and propylene (about 3-5 wt. % ethylene).
Inventors
- 👤 David V. Dobreski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:04
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08J2323/00; C08J2323/02; C08J2323/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A composition suitable for a cling/stretch wrap film consisting essentially of: a. from about 90 to 97.5 wt.% of an ethylene polymer selected from the group consisting of ethylene-vinyl acetate copolymers having a vinyl acetate content of from about 3 to about 15 wt.%, low density polyethylene homopolymers, and linear low density polyethylene resins, said ethylene polymer having a melt index value from about 0.2 to about 6.0 and b. from about 2.5 to about 10 wt.% of an amorphous low molecular weight ethylene-propylene copolymer, the copolymer having an ethylene content of from about 1 to about 7 wt.%, and wherein the ratio of the viscosity of the ethylene polymer to the viscosity of the ethylene-propylene copolymer varies from about 100 to about 100,000.
Claim 2
Dependent Claim
124 words
A composition suitable for a cling/stretch wrap film consisting essentially of: a. from about 90 to 97.5 wt.% of an ethylene polymer selected from the group consisting of ethylene-vinyl acetate copolymers having a vinyl acetate content of from about 3 to about 15 wt.%, low density polyethylene homopolymers, and linear low density polyethylene resins, said ethylene polymer having a melt index value from about 0.2 to about 6.0 and b. from about 2.5 to about 10 wt.% of an amorphous low molecular weight ethylene-propylene copolymer, the copolymer having an ethylene content of from about 1 to about 7 wt.%, and wherein the ratio of the viscosity of the ethylene polymer to the viscosity of the ethylene-propylene copolymer varies from about 100 to about 100,000.
Claim 3
Dependent Claim
73 words
The composition of claim 1 wherein: a. the wt.% of the ethylene polymer varies from about 94.5 to about 97, b. the ethylene-propylene copolymer wt.% varies from about 3 to about 5.5, c. the low density polyethylene and the linear low density polyethylene homopolymers have melt indices of from about 0.2 to about 6.0 and densities of from about 0.916 to about 0.928, and d. a minor amount of an antioxidant is added.
Claim 4
Dependent Claim
89 words
The composition of claim 2 wherein: a. the wt.% of the ethylene polymer varies from about 95 to about 96, b. the ethylene-propylene copolymer wt.% varies from about 4 to about 5, c. the ethylene-vinyl acetate copolymer has a vinyl acetate content of from about 3.5 to about 8 wt.%, d. the amount of antioxidant varies from about 100 to about 1000 ppm, based on the finished composition, and e. the ratio of the ethylene polymer viscosity to the ethylene-propylene copolymer viscosity is from about 100 to about 100,000.
Claim 5
Dependent Claim
42 words
The composition of claim 3 wherein: a. the ethylene-vinyl acetate copolymer has a vinyl acetate content of from about 4 to about 5 wt.%, and b. the antioxidant is selected from the group consisting of butylated hydroxy toluene and butylated hydroxy ethylbenzene.
Claim 6
Dependent Claim
74 words
The cling/stretch wrap film of claim 1 prepared from a composition consisting essentially of about 95-96 parts of an ethylene polymer selected from the group consisting of ethylene-vinyl acetate copolymers having a vinyl acetate content of from about 3 to about 15 wt.%, low density polyethylene homopolymers, and linear low density polyethylene resins, and about 4 to 5 parts of a low molecular weight amorphous ethylene-propylene copolymer of about 3 to 5 wt.% ethylene.
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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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |