EP0592284A2
Expired / Lapsed
EP
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Tear resistant multilayer films 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 more than five layers situated one on the other in a parallel array. The layers are individually selected from a stiff polyester or copolyester (13), a ductile polymeric material (11), and optionally, an intermediate material (12). The stiff polyester or copolyester is oriented in at least one direction. 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 many articles including security control laminates for glazing members.
Inventors
- 👤 Ralph H. c/o Minnesota Mining and Man. Bland
- 👤 James M. c/o Minnesota Mining and Man. Jonza
- 👤 James D. c/o Minnesota Mining and Man. Smith
- 👤 Richard C. c/o Minnesota Mining and Man. Allen
- 👤 Jeffrey F. c/o Minnesota Mining and Man. Bradley
- 👤 Kenneth B. c/o Minnesota Mining and Man. Smith
- 👤 Bruce D. c/o Minnesota Mining and Man. Stambaugh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 03:30
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B7/00; B32B7/02; B32B7/022; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/10165; B32B17/10174; B32B27/36; B32B7/04; B32B7/12; B32B2307/00; B32B2307/50; B32B2307/582; B32B2307/5825; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/911; Y10T; Y10T428/00; Y10T428/14; Y10T428/1438; Y10T428/1443; Y10T428/1448; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/28; Y10T428/2848; Y10T428/31504; Y10T428/31551; Y10T428/31554; Y10T428/31562; Y10T428/31565; Y10T428/31573; Y10T428/31616; Y10T428/31623; Y10T428/31645; Y10T428/31725; Y10T428/31728; Y10T428/31732; Y10T428/31736; Y10T428/31739; Y10T428/31743; Y10T428/3175; Y10T428/31757; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
50 words
A tear resistant film comprising more than five 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 that has been oriented in at least one direction and a ductile polymeric material.
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
26 words
A tear resistant film according to claim 1 wherein the layers of the ductile polymeric material have an average nominal thickness of less than 5 µm.
Claim 4
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 5
Dependent Claim
26 words
A tear resistant film according to claim 4 wherein the film has a tensile modulus of at least 175 kpsi in one direction of the film.
Claim 6
Dependent Claim
35 words
A tear resistant film according to claim 4 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 7
Dependent Claim
35 words
A tear resistant film according to claim 6 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 8
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 9
Dependent Claim
28 words
A tear resistant film according to claim 1 wherein the ductile polymeric material is selected from the group consisting of ethylene copolymers, polyesters, copolyesters, polyolefins, polyamides, and polyurethanes.
Claim 10
Dependent Claim
33 words
A tear resistant film according to claim 9 wherein the ductile polymeric material is a copolyester comprising the reaction product of cyclohexane dicarboxylic acid (or ester derivatives thereof), cyclohexane dimethanol and polytetramethylene glycol.
Claim 11
Dependent Claim
24 words
A tear resistant film according to claim 1 wherein the ductile polymeric material provides from about 1 to 20 weight percent of the film.
Claim 12
Dependent Claim
30 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 polymeric material.
Claim 13
Dependent Claim
54 words
A tear resistant film comprising more than 5 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, the layers of which have an average nominal thickness greater than 0.5 µm, and a ductile polymeric material.
Claim 14
Dependent Claim
123 words
A tear resistant film comprising at least five 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 polymeric material and a ductile polymeric, the layers of the ductile polymeric material having an average nominal thickness less than 5 µm, wherein the stiff polymeric material 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, and further wherein the ductile polymeric material is a copolyester comprising the reaction product of cyclohexane dicarboxylic acid, cyclohexane dimethanol and polytetramethylene glycol.
Claim 15
Dependent Claim
70 words
A security control laminate comprising first and second tear resistant films each according to any preceding claim, the first tear resistant 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 16
Dependent Claim
15 words
A security control laminate according to claim 15 further comprising means for absorbing ultraviolet radiation.
Claim 17
Dependent Claim
23 words
A security control laminate according to claim 16 further comprising a metalized layer on either the first or the second tear resistant film.
Claim 18
Dependent Claim
18 words
A security control laminate according to claim 16 further comprising an abrasion resistant coating over the metalized layer.
Claim 19
Dependent Claim
59 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 14, a first face, the tear resistant film being adhesively secured to at least one of the first and second surfaces faces of the glazing member.
Claim 20
Dependent Claim
34 words
A glazing unit according to claim 19 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 21
Dependent Claim
29 words
A glazing unit according to claim 20 further comprising a metalized layer on a face of the second tear resistant film which is opposite the first tear resistant film.
Claim 22
Dependent Claim
26 words
A glazing unit according to claim 21 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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