Patent EP0591055A2 successfully refreshed from Google Patents.
EP0591055A2
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EP
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Tear resistant multilayer films based on sebacic acid copolyesters and articles incorporating such films
Assignee: 3M Co
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Filing: 1993-09-30
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Granted: —
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Expires: 2013-09-30
Abstract
Abstract A tear resistant film (10) comprises at least three layers situated one on the other in a parallel array. The layers are individually selected from a stiff polyester or copolyester (13), a ductile sebacic acid based copolyester (11), and optionally, an intermediate material (12). Tear resistance may be measured in a Graves area test and reflects the ability of the film to absorb energy. The films of the invention are useful in may articles including security control laminates for glazing members.
Inventors
- 👤 Ralph H. c/o Minnesota Mining and Bland
- 👤 James M. C/O Minnesota Mining And Jonza
- 👤 James D. c/o Minnesota Mining and Smith
- 👤 Jeffrey F. c/o Minnesota Mining and Bradley
- 👤 Kenneth B. c/o Minnesota Mining and Smith
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 13:50
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/02; B32B7/022; B32B27/00; B32B27/06; B32B27/08; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/10165; B32B17/10174; B32B17/1033; B32B27/36; B32B7/04; B32B7/12; B32B2307/00; B32B2307/50; B32B2307/582; B32B2307/5825; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31616; Y10T428/31678; Y10T428/31681; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
43 words
A tear resistant film comprising at least three layers situated one on the other in a parallel array, the layers occurring essentially randomly in the array and being individually selected from a stiff polyester or copolyester and a ductile sebacic acid based copolyester.
Claim 2
Dependent Claim
25 words
A tear resistant film according to claim 1 wherein the layers of stiff polyester or copolyester have an average nominal thickness greater than 0.5 µm.
Claim 3
Dependent Claim
25 words
A tear resistant film according to claim 1 wherein the layers of the ductile copolyester have an average nominal thickness of less than 5 µm.
Claim 4
Dependent Claim
23 words
A tear resistant film according to claim 1 wherein the layers of stiff polyester or copolyester are oriented in at least one direction.
Claim 5
Dependent Claim
41 words
A tear resistant film according to claim 1 wherein the film has a Graves area in one direction of the film equal to at least about 40 + 0.4(x) kpsi%, wherein x is the nominal thickness of the film in microns.
Claim 6
Dependent Claim
26 words
A tear resistant film according to claim 5 wherein the film has a tensile modulus of at least 175 kpsi in one direction of the film.
Claim 7
Dependent Claim
35 words
A tear resistant film according to claim 5 wherein the film has a Graves elongation at break of at least 20% in the tear direction of the film measured during the determination of Graves area.
Claim 8
Dependent Claim
35 words
A tear resistant film according to claim 7 wherein the film has a Graves elongation at break of at least 40% in the tear direction of the film measured during the determination of Graves area.
Claim 9
Dependent Claim
18 words
A tear resistant film according to claim 1 wherein the film comprises from about 5 to 35 layers.
Claim 10
Dependent Claim
54 words
A tear resistant film according to claim 1 wherein the stiff polyester or copolyester comprises the reaction production of (a) a dicarboxylic acid component selected from the group consisting of terephthalic acid, naphthalene dicarboxylic acid and ester derivatives thereof and (b) a diol component selected from the group consisting of ethylene glycol and 1,4-butanediol.
Claim 11
Dependent Claim
41 words
A tear resistant film according to claim 1 wherein the sebacic acid based copolyester comprises the reaction product of (a) terephthalic acid and/or naphthalene dicarboxylic acid (or ester derivatives thereof), (b) sebacic acid (or ester derivatives thereof), and (c) ethylene glycol.
Claim 12
Dependent Claim
37 words
A tear resistant film according to claim 11 comprising 20 to 80 mole equivalents terephthalic acid (or ester derivatives thereof), 80 to 20 mole equivalents sebacic acid (or ester derivatives thereof), and 100 mole equivalents ethylene glycol.
Claim 13
Dependent Claim
38 words
A tear resistant film according to claim 12 comprising 70 to 50 mole equivalents terephthalic acid (or ester derivatives thereof), correspondingly, 30 to 50 mole equivalents sebacic acid (or ester derivatives thereof), and 100 mole equivalents ethylene glycol.
Claim 14
Dependent Claim
24 words
A tear resistant film according to claim 1 wherein the sebacic acid based copolyester provides about 1 to 20 weight percent of the film.
Claim 15
Dependent Claim
49 words
A tear resistant film according to claim 1 wherein the sebacic acid based copolyester comprises the reaction product of (a) terephthalic acid and/or napthalene dicarboxylic acid (or ester derivatives thereof), (b) sebacic acid (or ester derivatives thereof), (c) cyclohexane dicarboxylic acid (or ester derivatives thereof), and (d) ethylene glycol.
Claim 16
Dependent Claim
32 words
A tear resistant film according to claim 1 further comprising a layer of an intermediate material disposed between otherwise adjacent layers of stiff polyester or copolyester and ductile sebacic acid based copolyester.
Claim 17
Dependent Claim
68 words
A security control laminate comprising first and second tear resistant films each according to any preceding claim, the first film having a first face and a second face opposite the first face and a first layer of adhesive on the first face of the first tear resistant film, the second tear resistant film being adhesively bonded to the first tear resistant film by the first layer of adhesive.
Claim 18
Dependent Claim
22 words
A security control laminate according to claim 17 further comprising a metalized layer over either the first or the second multilayer film.
Claim 19
Dependent Claim
18 words
A security control laminate according to claim 18 further comprising an abrasion resistant coating on the metalized layer.
Claim 20
Dependent Claim
56 words
A glazing unit comprising a glazing member having a first surface and a second surface opposite the first surface and a first tear resistant film according to any one of claims 1 to 16, a first face of which is adhesively secured to at least one of the first and second surfaces of the glazing member.
Claim 21
Dependent Claim
34 words
A glazing unit according to claim 20 further comprising a second tear resistant film according to claim 1 on a second face of the first tear resistant film which is opposite the first face.
Claim 22
Dependent Claim
29 words
A glazing unit according to claim 21 further comprising a metalized layer on a face of the second tear resistant film which is opposite the first tear resistant film.
Claim 23
Dependent Claim
26 words
A glazing unit according to claim 22 further comprising an abrasion resistant coating on a surface of the metalized layer opposite the second tear resistant film.
References Cited (Backward Citations)
No citation records indexed.
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