US4713282A
Expired / Lapsed
US
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Films for use in stretch-packaging
Assignee: Mitsubishi Chemical Corp
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Filing: 1985-10-07
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Granted: 1987-12-15
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Expires: 2005-10-07
Abstract
Abstract PCT No. PCT/JP85/00555 Sec. 371 Date Jun. 6, 1986 Sec. 102(e) Date Jun. 6, 1986 PCT Filed Oct. 7, 1985 PCT Pub. No. WO86/02043 PCT Pub. Date Apr. 10, 1986.The present invention relates to a film for use in stretch-packaging that comprises an intermediate layer which contains as its main component an alpha -olefin-series resin component containing a butene-1-series resin and at least two surface layers each containing an ethylene-vinyl acetate copolymer resin as its main component, the surface layers being laminated over both surfaces of the intermediate layer. The film has remarkably high values of tear strength and recovery from deformation.
Inventors
- 👤 Takao Yazaki
- 👤 Masataka Noro
- 👤 Takashi Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:26
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/24992; Y10T428/31504; Y10T428/31786; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
64 words
A film for use in stretch-packaging, which comprises: an intermediate layer that has as its main component an α-olefin-series resin component containing a butene-1-series resin and at least two surface layers each containing as its main component an ethylene-vinyl acetate copolymer resin with a vinyl acetate content of 5 to 25 wt%, the surface layers being laminated over both surfaces of the intermediate layer.
Claim 2
Dependent Claim
64 words
A film for use in stretch-packaging, which comprises: an intermediate layer that has as its main component an α-olefin-series resin component containing a butene-1-series resin and at least two surface layers each containing as its main component an ethylene-vinyl acetate copolymer resin with a vinyl acetate content of 5 to 25 wt%, the surface layers being laminated over both surfaces of the intermediate layer.
Claim 3
Dependent Claim
36 words
The stretch-packaging film according to claim 1, wherein the α-olefin-series resin component in the intermediate layer consists of 10 to 90 wt% of the butene-1-series resin and 90 to 10 wt% of other α-olefin-series copolymer resin.
Claim 4
Dependent Claim
36 words
The stretch-packaging film according to claim 1, wherein the α-olefin-series resin component in the intermediate layer consists of 50 to 85 wt% of the butene-1-series resin and 50 to 15 wt% of other α-olefin-series copolymer resin.
Claim 5
Dependent Claim
59 words
The stretch-packaging film according to claim 2 or 3, wherein said other α-olefin-series copolymer resin is a propylene-α-olefin random copolymer resin which is a copolymer of propylene and at least one α-olefin selected from among ethylene and the α-olefins having 4 to 8 carbon atoms, the content of said α-olefin being in the range of 4 to 19 wt%.
Claim 6
Dependent Claim
56 words
The stretch-packaging film according to claim 2 or 3, wherein said other α-olefin-series copolymer resin is an ethylene-α-olefin copolymer resin which is a copolymer of ethylene and at least one α-olefin selected from among the α-olefins having 3 to 8 carbon atoms, the content of said α-olefin being in the range of 6 to 16 wt%.
Claim 7
Dependent Claim
77 words
The stretch-packaging film according to claim 2 or 3, wherein said other α-olefin-series copolymer resin is a mixture of a propylene-α-olefin random copolymer resin and an ethylene-vinyl acetate copolymer resin with a vinyl acetate content of 5 to 25 wt%, said random copolymer resin being a copolymer of propylene and at least one α-olefin selected from among ethylene and the α-olefins having 4 to 8 carbon atoms, the content of said α-olefin being 4 to 19 wt%.
Claim 8
Dependent Claim
74 words
The stretch-packaging film according to claim 2 or 3, wherein said other α-olefin-series copolymer resin is a mixture of an ethylene-α-olefin copolymer resin and an ethylene-vinyl acetate copolymer resin with a vinyl acetate content of 5 to 25 wt%, said ethylene-α-olefin copolymer resin being a copolymer of ethylene and at least one α-olefin selected from among the α-olefins having 3 to 8 carbon atoms, the content of said α-olefin being 6 to 16 wt%.
Claim 9
Dependent Claim
55 words
The stretch-packaging film according to claim 1, wherein said intermediate layer and each of said surface layers contains 0.5 to 5 wt% of an aliphatic alcohol-series fatty acid ester compound which is the reaction product of an aliphatic alcohol having 1 to 12 carbon atoms and a fatty acid having 10 to 22 carbon atoms.
Claim 10
Dependent Claim
47 words
The stretch-packaging film according to claim 1, wherein the film product has a thickness within the range of 8-30 μm, the intermediate layer of said film ranges in thickness from 2-10 μm, and each of the surface layers of the film range in thickness from 3-10 μm.
Claim 11
Dependent Claim
38 words
The stretch-packaging film according to claim 1, wherein said butene-1-series resin has a density ranging from 0.89 to 0.92 g/cm 3 and a melt flow rate at 190° C. within the range of 0.1 to 10 g/10 min.
Claim 12
Dependent Claim
22 words
The stretch-packaging film according to claim 10, wherein said butene-1-series resin has a density ranging from 0.895 to 0.910 g/cm 3 .
Claim 13
Dependent Claim
22 words
The stretch-packaging film according to claim 1, wherein said ethylene-vinyl acetate copolymer resin has a vinyl acetate content ranging from 10-20 wt.%
Claim 14
Dependent Claim
24 words
The stretch-packaging film according to claim 1, wherein said ethylene-vinyl acetate copolymer resin has an MFR ranging from 0.3-5 g/10 min at 190° C.
Claim 15
Dependent Claim
16 words
The stretch-packaging film according to claim 1, wherein said MFR value ranges from 1-3 g/10 min.
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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |