Patent EP0149321A1 successfully refreshed from Google Patents.
EP0149321A1
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Heat-shrinkable laminate tubular film and process for producing it
Assignee: Kureha Corp
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Filing: 1984-11-29
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Granted: —
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Expires: 2004-11-29
Abstract
Abstract Heat-shrinkable laminate tubular film comprising a gas-barrier layer of a copolymer of vinylidene chloride of thickness not less than 6 µm and not more than 30% of the total thickness of the film, outer layers of polyolefin, at least one intermediate layer of a polyamide or a thermoplastic polyester both having a crystal melting point of not more than 240°C and have a thickness of 5 to 40% of the total thickness of the film, and adhesive layers disposed between any of the above layers.
Inventors
- 👤 Masaki Ohya
- 👤 Yoshiharu Nishimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:05
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/14; B29C48/147; B29C48/1472; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/336; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; B32B27/30; B32B27/304; B32B27/32; B32B27/34; B32B27/36; B32B7/00; B32B7/04; B32B7/12; B29C2791/00; B29C2791/004; B29C2791/007; B29C61/08; B29K; B29K2023/00; B29K2023/04; B29K2023/08; B29K2023/083; B29K2027/00; B29K2067/00; B29K2077/00; B32B38/00; B32B38/0012; B32B2038/0028; B32B2307/00; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; B32B2323/04; B32B2323/046; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1334; Y10T428/1341; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24959; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31757; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
A heat-shrinkable laminate tubular film comprising a gas-barrier layer of a copolymer of vinylidene chloride having a thickness of not less than 6pm and not more than 30% of the total thickness of the tubular film, outer layers of a polyolefin, at least one intermediate layer of a polyamide or a thermoplastic polyester having a crystal melting point of not more than 240°C and a thickness of 5 to 40% of the total thickness of the tubular film, and adhesive layers disposed between any of the above layers.
Claim 2
Dependent Claim
88 words
A heat-shrinkable laminate tubular film comprising a gas-barrier layer of a copolymer of vinylidene chloride having a thickness of not less than 6pm and not more than 30% of the total thickness of the tubular film, outer layers of a polyolefin, at least one intermediate layer of a polyamide or a thermoplastic polyester having a crystal melting point of not more than 240°C and a thickness of 5 to 40% of the total thickness of the tubular film, and adhesive layers disposed between any of the above layers.
Claim 3
Dependent Claim
38 words
A heat-shrinkable laminate tubular film according to claim 1, wherein at least one of the outer layers is a copolymer of ethylene and vinyl acetate of a crystal melting point in a range of from 80 to 103°C.
Claim 4
Dependent Claim
76 words
A heat-shrinkable laminate tubular film according to claim 2, wherein one of the outer layers is a linear low-density polyethylene of a crystal melting point in a range of from 110 to 130°C or a mixture of not more than 40% by weight of the linear low-density polyethylene and not less than 60% by weight of a copolymer of ethylene and vinyl acetate of a crystal melting point in a range of from 80 to 103°C.
Claim 5
Dependent Claim
71 words
A heat-shrinkable laminate tubular film according to claim 1, wherein each of the outer layers is a mixture of not more than 40% by weight of a linear low-density polyethylene of a crystal melting point in a range of from 110 to 130°C and not less than 60% by weight of a copolymer of ethylene and vinyl acetate of a crystal melting point in a range of from 80 to 103°C.
Claim 6
Dependent Claim
122 words
A heat-shrinkable laminate tubular film according to claim 1, wherein the total thickness of the heat-shrinkable laminate tubular film is in a range of from 20 to 120 micrometers, the thickness of the gas-barrier layer is more than 6 µm and not more than 25% of the total thickness of the heat-shrinkable laminate tubular film, the thickness of the outer layer is in the range of 40 to 92% of the total thickness of the heat-shrinkable laminate tubular film, the thickness of the intermediate layer(s) of a polyamide or a thermoplastic polyester is in the range of 5 to 20% of the total thickness of the heat-shrinkable laminate tubular film, and the thickness of each of adhesive layers is 0.5 to 3.0µm.
Claim 7
Dependent Claim
178 words
Process for producing a heat-shrinkable laminate tubular film according to claim 1, comprising feeding a copolymer of vinylidene chloride as a gas-barrier layer, a polyolefin as outer layers, a polyamide or a thermoplastic polyester as at least one intermediate layer and an adhesive material as adhesive layers to an annular die provided with passages for the gas-barrier layer, the outer layers, the intermediate layer(s) and the adhesive layers and with adiabatic spaces disposed on the both sides of the passage(s) of the intermediate layer(s), in a molten state, the end portions of the passages of the gas-barrier layer, the outer layers, the intermediate layer(s) and the adhesive layers emerging into a common outlet of the annular die. laminating and extruding the copolymer of vinylidene chloride, the polyolefin, the polyamide or the thermoplastic polyester and the adhesive material, thereby forming laminate tubular film at the outlet of the annular die, cooling the resultant laminate tubular film by quenching, and after heating the laminate tubular film, biaxially stretching the resultant laminate tubular film, thereby forming a heat-shrinkable laminate tubular film.
References Cited (Backward Citations)
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