Patent EP0408042A2 successfully refreshed from Google Patents.
EP0408042A2
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EP
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Heat-sealable laminated polyester film
Assignee: Mitsubishi Chemical Corp
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Filing: 1990-07-12
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Granted: —
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Expires: 2010-07-12
Abstract
Abstract A heat-sealable laminated film is disclosed which comprises a heat-sealing layer formed of a copolyester and having a thickness of not less than 5 µm and a base layer formed of a copolyester containing the copolymerized unit common to the copolyester of the heat-sealing layer. The film of this invention excels in heat-sealing strength, is extensively usable in applications for packaging, electric insulation, and industry in general, and has high industrial value.
Inventors
- 👤 Yujiro Fukuda
- 👤 Koji Utsunomiya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 17:48
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/36; B32B27/06; B32B27/08; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/46; H01B3/465; B32B2250/00; B32B2250/24; B32B2250/244; B32B2264/00; B32B2264/10; B32B2307/00; B32B2307/20; B32B2307/206; B32B2307/30; B32B2307/31; B32B2367/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24364; Y10T428/24372; Y10T428/24405; Y10T428/24942; Y10T428/2495; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
189 words
A laminated film which comprises, B layer comprising a polyester containing terephthalic acid unit of not less than 60 mol% based on the total amount of the dicarboxylic acid component, ethylene glycol unit of not less than 60 mol% based on the total amount of the diol component, and at least one of a copolymerized dicarboxylic acid unit other than the terephthalic acid unit and a copolymerized diol unit other than the ethylene glycol unit, and A layer comprising a polyester containing terephthalic acid unit of not less than 95 mol% based on the total amount of the dicarboxylic acid component, ethylene glycol unit of not less than 95 mol% based on the total amount of the diol component, and at least one of a copolymerized dicarboxylic acid unit other than the terephthalic acid unit and a copolymerized diol unit other than the ethylene glycol unit, at least one of said copolymerized dicarboxylic acid unit and said copolymerized diol unit being commonly contained in said polyester of A layer and said polyester of B layer, and the heat sealing strength between said B layers being 400 g/15 mm width.
Claim 2
Dependent Claim
189 words
A laminated film which comprises, B layer comprising a polyester containing terephthalic acid unit of not less than 60 mol% based on the total amount of the dicarboxylic acid component, ethylene glycol unit of not less than 60 mol% based on the total amount of the diol component, and at least one of a copolymerized dicarboxylic acid unit other than the terephthalic acid unit and a copolymerized diol unit other than the ethylene glycol unit, and A layer comprising a polyester containing terephthalic acid unit of not less than 95 mol% based on the total amount of the dicarboxylic acid component, ethylene glycol unit of not less than 95 mol% based on the total amount of the diol component, and at least one of a copolymerized dicarboxylic acid unit other than the terephthalic acid unit and a copolymerized diol unit other than the ethylene glycol unit, at least one of said copolymerized dicarboxylic acid unit and said copolymerized diol unit being commonly contained in said polyester of A layer and said polyester of B layer, and the heat sealing strength between said B layers being 400 g/15 mm width.
Claim 3
Dependent Claim
66 words
A laminated film according to claim 1, wherein at least one of the content, based on the total amount of the dicarboxylic acid component, of said copolymerized dicarboxylic acid unit in the polyester of said B layer and the content, based on the total amount of the diol component, of said copolymerized diol unit in the polyester of said B layer is 6 to 40 mol%.
Claim 4
Dependent Claim
66 words
A laminated film according to claim 1, wherein at least one of the content, based on the total amount of the dicarboxylic acid component, of said copolymerized dicarboxylic acid unit in the polyester of said A layer and the content, based on the total amount of the diol component, of said copolymerized diol unit in the polyester of said A layer is 0.5 to 5 mol%.
Claim 5
Dependent Claim
103 words
A laminated film according to claim 1, wherein at least one of the content, based on the total amount of the dicarboxylic acid component, of said copolymerized dicarboxylic acid unit contained commonly in the polyester of said B layer and said polyester of said A layer and the content, based on the total amount of the diol component, of said copolymerized diol unit contained commonly in the polyester of said B layer and said polyester of said A layer is 6 to 40 mol% in the polyester of said B layer and 0.5 to 5 mol% in the polyester of said A layer.
Claim 6
Dependent Claim
20 words
A laminated film according to claim 1, wherein the thickness of said B layer is not less than 5 µm.
Claim 7
Dependent Claim
52 words
A laminated film according to claim 1, wherein said copolymerized unit contained commonly in the polyesters of said B layer and said A layer is at least one compound selected from the group consisting of isophthalic acid, adipic acid, sebacic acids 1,10-decanedicarboxylic acids neopentyl glycol, 1,4-butane diol, polyalkylene glycols, and 1,4-cyclohexane dimethanol.
Claim 8
Dependent Claim
31 words
A laminated film according to claim 1, wherein the heat-sealing strength between said B layers after a treatment at 90°C for 30 min is not less than 100 g/15 mm width.
Claim 9
Dependent Claim
21 words
A laminated film according to claim 1, wherein the glass transition temperature of said B layer is not lower than 40°C.
Claim 10
Dependent Claim
25 words
A laminated film according to claim 1, wherein degree of planar orientation of an outer surface of said B layer is not more than 0.020.
Claim 11
Dependent Claim
54 words
A laminated film according to claim 1, wherein the average refractive index, n ₁, of said B layer after the film is biaxially stretched and heat-set and the average refractive index, n ₀, of the unstretched film in the substantially amorphous state for satisfy the following formula: n ₁ ≦ n ₀ + 0.005
Claim 12
Dependent Claim
33 words
A laminated film according to claim 1, wherein the ratio of the maximum height (Rt) to the average roughness (Ra) of the outer surface of said B layer is not more than 20.
Claim 13
Dependent Claim
27 words
A laminated film according to claim 1, wherein the center line average roughness of the outer surface of said A layer is not less than 0.020 µm.
Claim 14
Dependent Claim
33 words
A laminated film according to claim 1, wherein the ratio of the thickness of said A layer to the thickness of said B layer is 80 : 20 to 20 : 80 .
References Cited (Backward Citations)
No citation records indexed.
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