Patent US4623587A successfully refreshed from Google Patents.
US4623587A
Expired / Lapsed
US
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Multi-layer film or sheet material
Assignee: Idemitsu Petrochemical Co Ltd
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Filing: 1984-10-09
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Granted: 1986-11-18
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Expires: 2004-10-09
Abstract
Abstract The invention provides a multi-layer film or sheet material of thermoplastic resins having a high adhesive bonding strength between layers as well as excellent heat-sealability. The multi-layer film or sheet material comprises a layer A formed of a resin composition composed of a polypropylene-based resin and a linear low-density ethylene alpha -olefin copolymer having specified density and a layer B formed of a polypropylene-based resin or a layer formed of a resin composition of a polypropylene-based resin and a low-crystallinity alpha -olefin copolymer. The invention also provides a laminated film or sheet material comprising a base material, e.g. plastic film, paper, aluminum foil, etc., and the above defined multi-layer film or sheet material bonded together through an intermediate layer of an adhesive in such a manner that the layer A in the multi-layer film or sheet material faces the base material.
Inventors
- 👤 Masakazu Ito
- 👤 Shinji Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:21
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/322; B32B37/00; B32B37/12; B32B37/1284; B32B37/14; B32B37/15; B32B37/153; B32B7/00; B32B7/04; B32B7/12; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/10; C08L23/14; B32B38/00; B32B38/16; B32B38/164; B32B2038/168; B32B2307/00; B32B2307/70; B32B2307/72; B32B2309/00; B32B2309/02; B32B2309/08; B32B2309/10; B32B2309/105; B32B2309/12; B32B2323/00; B32B2323/04; B32B2323/046; B32B2323/10; B32B2439/00; B32B2439/02; B32B2439/06; B32B2439/70; B32B38/0008; C08L23/16; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
101 words
A multi-layer film or sheet material which comprises: (A) a layer formed of a resin composition consisting essentially from 5 to 80 parts by weight of the polypropylene-based resin and from 95 to 20 parts by weight of the linear low-density ethylene α-olefin copolymer having a density in the range from 0.900 to 0.950 g/cm3; and (B) a layer formed of a resin composition consisting essentially from 50 to 99 parts by weight of the polypropylene-based resin and from 50 to 1 part by weight of the low-crystallinity α-oelfin copolymer having a density of from 0.860 to 0.890 g/cm 3 .
Claim 2
Dependent Claim
101 words
A multi-layer film or sheet material which comprises: (A) a layer formed of a resin composition consisting essentially from 5 to 80 parts by weight of the polypropylene-based resin and from 95 to 20 parts by weight of the linear low-density ethylene α-olefin copolymer having a density in the range from 0.900 to 0.950 g/cm3; and (B) a layer formed of a resin composition consisting essentially from 50 to 99 parts by weight of the polypropylene-based resin and from 50 to 1 part by weight of the low-crystallinity α-oelfin copolymer having a density of from 0.860 to 0.890 g/cm 3 .
Claim 3
Dependent Claim
147 words
A laminated film or sheet material which comprises: (1) a base material; and (2) a multi-layer film or sheet material comprising (A) a layer formed of a resin composition consisting essentially of from 5-80 parts by weight of a polypropylene-based resin and from 95-20 parts by weight of a linear low-density ethylene α-olefin copolymer having a density in the range from 0.900 to 0.950 g/cm 3 and (B) a layer formed of a polypropylene-based resin or a layer formed of a resin composition consisting essentially of from 50-99 parts by weight of a polypropylene-based resin and from 50-1 parts by weight of a low-crystallinity α-olefin copolymer having a density of from 0.860 to 0.890 g/cm 3 ; and (3) a layer of an adhesive positioned between and bonded to (i) the base material (1) and (ii) the layer (A) of said multi-layer film or sheet material (2).
Claim 4
Dependent Claim
147 words
A laminated film or sheet material which comprises: (1) a base material; and (2) a multi-layer film or sheet material comprising (A) a layer formed of a resin composition consisting essentially of from 5-80 parts by weight of a polypropylene-based resin and from 95-20 parts by weight of a linear low-density ethylene α-olefin copolymer having a density in the range from 0.900 to 0.950 g/cm 3 and (B) a layer formed of a polypropylene-based resin or a layer formed of a resin composition consisting essentially of from 50-99 parts by weight of a polypropylene-based resin and from 50-1 parts by weight of a low-crystallinity α-olefin copolymer having a density of from 0.860 to 0.890 g/cm 3 ; and (3) a layer of an adhesive positioned between and bonded to (i) the base material (1) and (ii) the layer (A) of said multi-layer film or sheet material (2).
Claim 5
Dependent Claim
70 words
The laminated film or sheet material as claimed in claim 2 wherein the layer (A) of the multi-layer film or sheet material is formed of a resin composition consisting essentially of from 5 to 80 parts by weight of the polypropylene-based resin and from 95 to 20 parts by weight of the linear low-density ethylene α-olefin copolymer having a density in the range from 0.900 to 0.950 g/cm 3 .
Claim 6
Dependent Claim
55 words
The laminated film or sheet material as claimed in claim 2 wherein the layer (B) of the multi-layer film or sheet material is formed of a resin composition consisting essentially of from 50 to 99 parts by weight of the polypropylene-based resin and from 50 to 1 part by weight of the low-crystallinity α-olefin copolymer.
Claim 7
Dependent Claim
39 words
The laminated film or sheet material as claimed in claim 2 wherein the layer (3) is formed of an adhesive consisting essentially of an ethylene-based polymer having a density in the range from 0.860 to 0.940 g/cm 3 .
Claim 8
Dependent Claim
39 words
The laminated film or sheet material as claimed in claim 1 wherein the polypropylene-based resin in the layer (A) has a density of from 0.895 to 0.915 g/cm 3 and a melt index from 0.5 to 30 g/10 minutes.
Claim 9
Dependent Claim
43 words
The laminated film or sheet material as claimed in claim 1 wherein the linear low-density ethylene α-olefin copolymer of the layer (A) has a density of from 0.900 to 0.930 g/cm 3 and a melt index of from 0.5 to 30 g/10 minutes.
Claim 10
Dependent Claim
50 words
The multi-layer film or sheet material as claimed in claim 1 wherein said layer (A) is formed of a resin composition consisting essentially of from 10 to 60 parts by weight of the polypropylene-based resin and from 90 to 40 parts by weight of the linear low-density ethylene α-olefin copolymer.
Claim 11
Dependent Claim
39 words
The multi-layer film or sheet material as claimed in claim 1 wherein the low-crystallinity α-olefin copolymer of the layer (B) has a melt index of from 0.01 to 50 g/10 minutes and a degree of crystallinity up to 30%.
Claim 12
Dependent Claim
48 words
The multi-layer film or sheet material as claimed in claim 1 wherein the layer (B) is formed of a resin composition consisting essentially of from 70 to 90 parts by weight of the polypropylene-based resin and from 30 to 5 parts by weight of the low-crystallinity α-olefin copolymer.
Claim 13
Dependent Claim
48 words
The multi-layer film or sheet material as claimed in claim 5 wherein the layer (B) is formed of a resin composition consisting essentially of from 70 to 90 parts by weight of the polypropylene-based resin and from 30 to 5 parts by weight of the low-crystallinity α-olefin copolymer.
Claim 14
Dependent Claim
94 words
The multi-layer film or sheet material as claimed in claim 11 wherein the polypropylene-based resin in the layer (A) has a density of from 0.895 to 0.915 g/cm 3 and a melt index from 1.0 to 20 g/10 minutes; said linear low-density ethylene α-olefin copolymer has a density from 0.900 to 0.930 g/cm 3 and a melt index of from 1.0 to 20 g/10 minutes; and wherein said low-crystallinity α-olefin copolymer of the layer (B) has a melt index of from 0.05 to 20 g/10 minutes and a degree of crystallinity up to 25%.
Claim 15
Dependent Claim
37 words
The multi-layer film or sheet material as claimed in claim 12 wherein said layer (A) has a thickness of from 1 to 20 μm and the thickness of the layer (B) is from 1 to 50 μm.
Claim 16
Dependent Claim
39 words
The laminated film or sheet material as claimed in claim 2 wherein the polypropylene-based resin in the layer (A) has a density of from 0.895 to 0.915 g/cm 3 and a melt index from 0.5 to 30 g/10 minutes.
Claim 17
Dependent Claim
43 words
The laminated film or sheet material as claimed in claim 2 wherein the linear low-density ethylene α-olefin copolymer of the layer (A) has a density of from 0.900 to 0.930 g/cm 3 and a melt index of from 0.5 to 30 g/10 minutes.
Claim 18
Dependent Claim
50 words
The laminated film or sheet material as claimed in claim 2 wherein said layer (A) is formed of a resin composition consisting essentially of from 10 to 60 parts by weight of the polypropylene-based resin and from 90 to 40 parts by weight of the linear low-density ethylene α-olefin copolymer.
Claim 19
Dependent Claim
39 words
The laminated film or sheet material as claimed in claim 2 wherein the low-crystallinity α-olefin polymer of the layer (B) has a melt index of from 0.01 to 50 g/10 minutes and a degree of crystallinity up to 30%.
Claim 20
Dependent Claim
48 words
The laminated film or sheet material as claimed in claim 2 wherein the layer (B) is formed of a resin composition consisting essentially of from 70 to 90 parts by weight of the polypropylene-based resin and from 30 to 5 parts by weight of the low-crystallinity α-olefin copolymer.
Claim 21
Dependent Claim
48 words
The laminated film or sheet material as claimed in claim 16 wherein the layer (B) is formed of a resin composition consisting essentially of from 70 to 90 parts by weight of the polypropylene-based resin and from 30 to 5 parts by weight of the low-crystallinity α-olefin copolymer.
Claim 22
Dependent Claim
94 words
The laminated film or sheet material as claimed in claim 19 wherein the polypropylene-based resin in the layer (A) has a density of from 0.895 to 0.915 g/cm 3 and a melt index from 1.0 to 20 g/10 minutes; said linear low-density ethylene α-olefin copolymer has a density from 0.900 to 0.930 g/cm 3 and a melt index of from 1.0 to 20 g/10 minutes; and wherein said low-crystallinity α-olefin copolymer of the layer (B) has a melt index of from 0.05 to 20 g/10 minutes and a degree of crystallinity up to 25%.
Claim 23
Dependent Claim
37 words
The laminated film or sheet material as claimed in claim 20 wherein said layer (A) has a thickness of from 1 to 20 μm and the thickness of the layer (B) is from 1 to 50 μm.
References Cited (Backward Citations)
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US4505969A
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EP0095299A2
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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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |