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Patent US4144214A successfully refreshed from Google Patents.
US4144214A
Expired / Lapsed
US
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Extensible films for packaging foodstuffs
Assignee: Montedison SpA
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Filing: 1977-10-18
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Granted: 1979-03-13
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Expires: 1997-10-18
Abstract
Abstract Extensible, transparent, and self-adhering films, particularly suitable for packaging food, are disclosed. The films, which are also useful for sealing open containers, have a thickness of from 10 to 40 microns and consist of a mixture comprising low-density polyethylene, amorphous ethylene/propylene copolymers, at least one monoglyceride of a fatty acid containing from 12 to 25 carbon atoms in the chain, and vaseline oil.
Inventors
- 👤 Carlo Corbacella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:14
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B; B65; B65D; B65D65/00; B65D65/38; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11; C08L23/16; C08L91/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
Extensible films for packaging, having a thickness comprised between 10 and 40 microns and consisting of a mixture comprising the following components: (a) from 70 to 95 parts by weight of a polyethylene having a density of 0.918 to 0.925; (b) from 30 to 5 parts by weight of an amorphous ethylene/propylene copolymer, having a Mooney viscosity at 100° C. comprised between 20 and 60; (c) from 0.1 to 1 part by weight, on 100 parts by weight of (a) + (b), of at least one monoglyceride of fatty acid containing, with reference to the fatty acid, from 12 to 25 carbon atoms in the chain; and (d) from 0.1 to 0.5 parts by weight, on 100 parts by weight of (a) + (b), of paraffin oil.
Claim 2
Dependent Claim
127 words
Extensible films for packaging, having a thickness comprised between 10 and 40 microns and consisting of a mixture comprising the following components: (a) from 70 to 95 parts by weight of a polyethylene having a density of 0.918 to 0.925; (b) from 30 to 5 parts by weight of an amorphous ethylene/propylene copolymer, having a Mooney viscosity at 100° C. comprised between 20 and 60; (c) from 0.1 to 1 part by weight, on 100 parts by weight of (a) + (b), of at least one monoglyceride of fatty acid containing, with reference to the fatty acid, from 12 to 25 carbon atoms in the chain; and (d) from 0.1 to 0.5 parts by weight, on 100 parts by weight of (a) + (b), of paraffin oil.
Claim 3
Dependent Claim
27 words
Film according to claim 1, containing between 80 and 95 parts by weight of component (a) and between 5 and 20 parts by weight of component (b).
Claim 4
Dependent Claim
20 words
Film according to claim 1, characterized in that the polyethylene has a Melt Index value of from 2 to 6.
Claim 5
Dependent Claim
22 words
Film according to claim 1, characterized in that the ethylene-propylene copolymer contains between 70 and 50% in moles of polymerized ethylene units.
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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |