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EP0050455A2
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Composite film structures of ethylenic polymers
Assignee: Mitsui Chemicals Inc
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Filing: 1981-10-08
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Granted: —
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Expires: 2001-10-08
Abstract
Abstract A composite film structure composed of a layer (A) of high density polyethylene having an intrinsic viscosity [n] as measured in decalin at 135°C of 1.3 to 2.9 dl/g, a melt index (MI A ) of 0.3 to 7.0 g/10 min. and a density of 0.950 to 0.970 g/cm3, in which up to 2 mole % of an alpha-olefin may be contained; and layers (B) of an ethylene/C 5 -C 10 alpha-olefin random copolymer having an intrinsic viscosity [n] as measured in decalin at 135°C of 1.0 to 2.4 dl/g, a melt index (MI B ) of 0.5 to 20 g/10 min., a density of 0.910 to 0.940 g/cm 3 , and a melting point of 115 to 130°C, with the proviso that the MI A /MI B ratio is 0.15/1 to 4.0/l, said layers (B) being in direct contact with the two sides of said layer (A) and laminated thereto.
Inventors
- 👤 Hiromi Shigemoto
- 👤 Taketo Mimura
- 👤 Tsuneo Kishiba
- 👤 Susumu Hatabu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:25
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/322; B32B2323/00; B32B2323/04; B32B2323/043; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A composite film structure composed of a high density polyethylene film laminated to an ethylene copolymer film, characterised by comprising a layer (A) of high density polyethylene having an intrinsic viscosity [n] as measured in decalin at 135°C of 1.3 to 2.9 dl/g, a melt index [MI A ] of 0.3 to 7.0 g/10 min. and a density of 0.950 to 0.970 g/cm 3 , in which up to 2 mole % of an alpha-olefin may be contained; and layers (B) of an ethylene/C 5 - C 10 alpha-olefin random copolymer having an intrinsic viscosity [n] as measured.in decalin at 135°C of 1.0 to 2.4 dl/g, a melt index (MI B ) of 0.5 to 20 g/10 min., a density of 0.910 to 0.940 g/cm 3 , and a melting point of 115 to 130°C, with the proviso that the MI A /MI B ratio is 0.15/1 to 4.0/1, said layers (B) being in direct contact with the two sides of said layer (A) and laminated thereto.
Claim 2
Dependent Claim
167 words
A composite film structure composed of a high density polyethylene film laminated to an ethylene copolymer film, characterised by comprising a layer (A) of high density polyethylene having an intrinsic viscosity [n] as measured in decalin at 135°C of 1.3 to 2.9 dl/g, a melt index [MI A ] of 0.3 to 7.0 g/10 min. and a density of 0.950 to 0.970 g/cm 3 , in which up to 2 mole % of an alpha-olefin may be contained; and layers (B) of an ethylene/C 5 - C 10 alpha-olefin random copolymer having an intrinsic viscosity [n] as measured.in decalin at 135°C of 1.0 to 2.4 dl/g, a melt index (MI B ) of 0.5 to 20 g/10 min., a density of 0.910 to 0.940 g/cm 3 , and a melting point of 115 to 130°C, with the proviso that the MI A /MI B ratio is 0.15/1 to 4.0/1, said layers (B) being in direct contact with the two sides of said layer (A) and laminated thereto.
Claim 3
Dependent Claim
19 words
A composite film structure according to claim 1 wherein said MI A/ MI B ratio is 0.4/1 to 2.0/1.
Claim 4
Dependent Claim
24 words
A composite film structure according to claim 1 or 2 wherein said ethylene random copolymer is an ethylene/C 6 - C a alpha-olefin copolymer.
Claim 5
Dependent Claim
56 words
A composite film structure according to claim 1, 2 or 3 wherein said high density polyethylene is one having an intrinsic viscosity [n] as measured in decalin at 135°C of 1.6 to 2.4 dl/g, a melt index (MI A ) of 0.5 to 3.0 g/10 min., and a density of 0.950 to 0.965 g/cm 3 .
Claim 6
Dependent Claim
64 words
A composite film structure according to any one of the preceding claims wherein said ethylene random copolymer is one having an intrinsic viscosity [n] as measured in decalin at 135°C of 1.2 to 2.0 dl/g, a melt index (MI B ) of 1.0 to 10 g/10 min., a density of 0.915 to 0.935 g/cm 3 , and a melting point of 115 to 125°C.
Claim 7
Dependent Claim
32 words
A composite film structure according to any one of the preceding claims wherein the thciknesses of said layers (A) and (B) are 5 to 100 microns and 1 to 20 microhs, respectively.
Claim 8
Dependent Claim
20 words
Use of a composite film structure as claimed in any one of the preceding claims in the packaging of foodstuffs.
References Cited (Backward Citations)
No citation records indexed.
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