Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
2000-06-09
2002-03-12
Boykin, Terressa M. (Department: 1711)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
Reexamination Certificate
active
06355345
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a laminate film for preventing glass from shattering. More specifically, it relates to a laminate film for preventing glass from shattering, which has excellent adhesive properties, scratch resistance and impact resistance and is suitable for use as a surface-protecting material for a window pane, showcase, microwave oven door, plasma display panel, and Braun tube of a TV or monitor.
BACKGROUND ART
A biaxially oriented polyethylene-2,6-naphthalene dicarboxylate film receives attention for its use in various fields because it has excellent mechanical properties, heat resistance and chemical resistance as compared with a biaxially oriented polyethylene terephthalate film.
Particularly, recently, it receives attention for its use as a surface-protecting material having a glass shatterproof effect for its use in a window pane, showcase, microwave oven door, plasma display panel, or Braun tube of a TV or monitor. To be used as such a material, it is required to have not only excellent surface hardness and abrasion resistance but also sufficient transparency, antireflection property and glass shatterproof performance.
To meet such a requirement, an attempt is made to laminate a hard coat (HC) layer and an antireflection (AR) layer on a polyester film. The attempt, however, fails to give a satisfactory result because the adhesion of the layers to the polyester film is not sufficient.
JP-A 7-156358 discloses an easily adhesive film that has a coating layer, which is substantially formed of an aqueous polyester having a secondary transition temperature of 40 to 85° C. and which has a thickness of 0.05 to 0.3 &mgr;m, on the surface of a polyester film and that shows excellent adhesion to the medium layer of an inmold transfer film, for example, a medium layer of melamine resin.
JP-A 63-194948 discloses a flat, easily adhesive polyester film that has a coating film, which comprises polyurethane, acrylic resin, fatty acid amide or fatty acid bisamide, and a surface-roughening material (D) having an average particle diameter of 0.15 &mgr;m or less and which has a center line average surface roughness (Ra) of 0.002 to 0.01 &mgr;m, on the surface of a polyester film.
JP-B 7-80281 discloses a plastic laminate consisting of a polyethylene terephthalate layer, a polyester resin layer having a crystal fusion heat of 0.2 to 5 cal/g, and a radiation-curable layer. The above radiation-curable layer comprises a radiation-curable reaction product of a composition comprising monomers having at least two (meth)acryloyloxy groups in a molecule and N-vinylpyrrolidones.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a laminate film for preventing glass from shattering, which has not only excellent adhesion, surface hardness and scratch resistance but also sufficient transparency, antireflection capability and glass shatterproof performance.
It is another object of the present invention to provide a precursory laminate film that has excellent properties for the above laminate film of the present invention, and a base film therefor.
Still other objects and advantages of the present invention will be apparent from the following description.
According to the present invention, firstly, the above objects and advantages of the present invention are achieved by a laminate film for preventing glass from shattering, which comprises:
(A) a biaxially oriented polyester film of a copolyester containing ethylene-2,6-naphthalenedicarboxylate recurring units in an amount of at least 80 mol % of all recurring units,
(B) an adhesive coating film on at least one side of the above biaxially oriented polyester film, the adhesive coating film comprising a composition which contains a water-soluble or dispersible polyester having a secondary transition temperature of 40 to 85° C. and at least one amide compound selected from the group consisting of fatty acid amide and fatty acid bisamide,
(C) a hard coat layer on the above adhesive coating film, with the proviso that when the adhesive coating film is formed on both sides of the biaxially oriented polyester film, the hard coat layer is formed on only one of the adhesive coating films, and
(D) an antireflection layer on the above hard coat layer.
Secondly, the above objects and advantages of the present invention are achieved by a precursory laminate film for preventing glass from shattering, which comprises:
(A) a biaxially oriented polyester film of a copolyester containing ethylene-2,6-naphthalenedicarboxylate recurring units in an amount of at least 80 mol % of all recurring units, and
(B) an adhesive coating film on at least one side of the above biaxially oriented polyester film, the adhesive coating film comprising a composition which contains a water-soluble or dispersible polyester having a secondary transition temperature of 40 to 85° C. and at least one amide compound selected from the group consisting of fatty acid amide and fatty acid bisamide.
Thirdly, the above objects and advantages of the present invention are achieved by a base film for a laminate film for preventing glass from shattering, which (A) comprises
(a) a copolyester containing ethylene-2,6-naphthalenedicarboxylate recurring units in an amount of at least 80 mol % of all recurring units and which has
(b) a plane orientation coefficient of 0.250 or more and
(c) an intrinsic viscosity of 0.45 dl/g or more.
DETAILED DESCRIPTION OF THE INVENTION
A biaxially oriented polyester film is used as a base film for the laminate film and precursory laminate film of the present invention.
The biaxially oriented polyester film comprises a copolyester containing ethylene-2,6-naphthalenedicarboxylate recurring units (will sometimes be referred to as PEN hereinafter) in an amount of at least 80 mol % of all recurring units.
That is, this PEN may be a homopolymer whose recurring units are all ethylene-2,6-naphthalenedicarboxylate recurring units or a copolymer which contains acid components other than 2,6-naphthalenedicarboxylic acid and/or glycol components other than ethylene glycol in such an amount that the amount of the ethylene-2,6-naphthalenedicarboxylate recurring units is 80 mol % or less. If the amount of polymerization units other than the ethylene-2,6-naphthalenedicarboxylate recurring units is less than 20 mol %, advantageously, the PEN film does not lose its inherent properties in the extreme and shows an excellent glass shatterproof performance when used at high temperatures.
If the amount of the polymerization units other than the ethylene-2,6-naphthalenedicarboxylate recurring units exceeds 20 mol %, the PEN film loses the properties inherent to the polyethylene-2,6-naphthalenecarboxylate film, whereby the impact resistance becomes insufficient, with the result that the glass shatterproof performance cannot be obtained in some cases.
The amount of the ethylene-2,6-naphthalenedicarboxylate recurring units contained is more preferably at least 85 mol %, particularly preferably at least 90 mol %.
Illustrative examples of the acid components other than 2,6-naphthalenedicarboxylic acid include dicarboxylic acids such as oxalic acid, adipic acid, phthalic acid, sebacic acid, dodecanedicarboxylic acid, isophthalic acid, terephthalic acid, 1,4-cyclohexanedicarboxylic acid, 4,4-diphenyldicarboxylic acid, phenylindandicarboxylic acid, 2,7-naphthalenedicarboxylic acid and diphenyletherdicarboxylic acid; oxycarboxylic acids such as p-oxybenzoic acid and p-oxyethoxybenzoic acid; and the like.
Preferable examples of the glycol components other than ethylene glycol include dihydroxy alcohols such as propylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, cyclohexanemethylene glycol, neopentylglycol, bisphenolsulfone adduct with ethylene oxide, bisphenol A adduct with ethylene oxide, diethylene glycol, polyethylene glycol and the like.
Part or all of the terminal hydroxyl groups and/or carboxyl groups of the PEN may be blocked by a monofunctional compound such as benzoic acid and methoxypolyalkylene glycol, o
Furuya Koji
Kawai Shinichi
Suzuki Kenji
Watanabe Shinya
Boykin Terressa M.
Teijin Limited
LandOfFree
Laminate film for preventing glass from shattering does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Laminate film for preventing glass from shattering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laminate film for preventing glass from shattering will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2889762