Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Coating or impregnating workpiece before molding or shaping...
Reexamination Certificate
1998-09-24
2002-05-28
Nakarani, D. S. (Department: 1773)
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Coating or impregnating workpiece before molding or shaping...
C264S235800, C427S532000, C427S541000, C427S543000, C427S544000, C427S545000, C427S546000, C428S423500, C428S423700, C428S424400, C428S424800, C428S425800, C428S451000, C428S463000, C428S480000, C428S483000, C428S475200, C428S476300, C428S520000, C428S522000
Reexamination Certificate
active
06395209
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a deposited plastic film. More particularly, the present invention relates to a deposited plastic film having a thin layer comprising metal or metal oxide, which films are excellent in adhesion property and gas-barrier property after boiling treatment.
Deposited plastic films having a thin layer comprising metal or metal oxide (hereinafter occasionally referred to merely as “deposited film”) have been used in extensive applications because these films can exhibit various useful properties such as gas-barrier property, visible light- or ultraviolet light-shielding property, heat ray-reflecting property, electrical conductivity,,transparent conductive property, magnetically recording property or the like by selecting appropriate metal and/or metal oxide as a material deposited on the film. For example, the deposited films have been applied to wrapping or packaging materials, decorative materials, shielding materials for window glass, materials for gold and silver threads, capacitor materials, display materials, materials for wiring boards, magnetic recording materials or the like. Further, in recent years, there has been intense attention to the application of such deposited films to a part of a transparent conductive sheet used in liquid crystal display devices, solar batteries, electromagnetic shielding panels, touch panels, electroluminescent (EL) panels, color filters or the like.
However, the deposited film tends to suffer from partial separation of a deposit layer formed thereon, especially during production thereof or when contacted with water, so that the properties of the deposited film, such as gas-barrier property are deteriorated.
Conventionally, it is known that in order to prevent the deposited film from being deteriorated in gas-barrier property, a coating layer (undercoat layer) comprising various polyurethanes, various polyesters or a mixture of polyurethane and polyester is formed between a base polyester film and a deposit layer of the deposited film (for example, Japanese Patent Application Laid-Open (KOKAI) No. 2-50837). Further, in order to improve water-resistance of adhesion property and solvent resistance of the deposited films, it has been proposed to apply a coating solution containing specific polyurethane, polyester and epoxy compound thereon (Japanese Patent Application Laid-Open (KOKAI) No. 4-176858).
However, many of the conventional deposited films have been still unsatisfactory in water resistance (hot water resistance) and solvent resistance under high-temperature conditions. Therefore, for instance, in the case where food is wrapped or packaged by a deposited polyester film which tends to be most ordinarily used for this purpose, there arises a problem that the deposited film cannot exhibit a sufficient gas-barrier property after subjected to boiling treatment or printed with solvent-based ink. Especially, deposited polyester films produced by reuse of polyester film chips have such a disadvantage that gas-barrier property thereof is considerably deteriorated. Further, in association with the spread of application fields of deposited polyester films, it has been demanded to provide deposited polyester films having a higher adhesion property or a high-reliable gas-barrier property.
In addition, a coating layer used as an anchor coat may be formed on a base polyester film either after completion of the film-forming process or by in-line coating method during the film-forming process. For example, in the production of biaxially stretched films, after a coating material constituting the anchor coat is applied onto a uniaxially stretched film, the dried or undried coated film is further stretched in transverse direction and then heat-treated. This method enables film formation, coating and drying to be conducted simultaneously, so that it has been expected to considerably reduce the production cost of the films. However, as a base film for deposited films, there is no suitable film on which a coating layer formed by the above-mentioned in-line coating method. In the case where the conventional film is used as a base film, the resultant deposited film is less satisfactory in solvent resistance and hot water resistance than those produced by ordinary methods, thereby causing a problem that a gas-barrier property of the film is considerably deteriorated after printing or after hot water treatments such as boiling and retorting.
As a result of the present inventors' earnest studies for solving the above-mentioned problems, it has been found that by using a coating solution containing specific resins, there can be obtained a deposited plastic film having excellent properties. The present invention has been attained on the basis of this finding.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a deposited plastic film having an excellent adhesion property between a base film and a deposit layer, and an excellent gas-barrier property after boiling treatment or printing.
To attain the aim, in a first aspect of the present invention, there is provided a deposited plastic film comprising:
a plastic film;
a coating layer which is formed on at least one surface of said plastic film and comprises a cured resin composition obtained by curing resin composition comprising 6 to 80% by weight of an oxazoline group-containing water-soluble polymer; and
a deposit layer which comprises a metal, metal oxide or mixture thereof and is formed on a surface of said coating layer.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
As raw materials for the plastic film as a base film of the deposited plastic film according to the present invention, any plastic materials preferable for forming films can be used without particular limitations. Specific examples of the raw materials for the plastic film may include polyolefins such as homopolymers or copolymers of ethylene, propylene, butene or the like; amorphous polyolefins such as cyclic polyolefins; polyester-based resins such as polyethylene terephthalate or polyethylene-2,6-naphthalate; polyamides such as nylon 6, nylon 12 or copolymerized nylons; polyvinyl alcohol; partially hydrolyzed products of ethylene-vinyl acetate copolymer (EVOH); polyimides; polyether imides; polysulfones; polyether sulfones; polyether ether ketones; polycarbonates (PC); polyvinyl butyral; polyacrylates; ethylene-ethylene tetrafluoride copolymers; ethylene chloride trifluoride; ethylene tetrafluoride-perfluoroalkyl vinyl ether copolymers; polyvinylidene fluoride; polyvinyl fluoride; fluorocarbon resins such as perfluoroethylene-perfluoropropylene-perfluorovinyl ether terpolymers; resin compositions composed of acrylate compounds containing radical-reactive unsaturated groups; resin compositions composed of these acrylate compounds and thiol-containing mercapto compounds; photocurable resins, e.g., resin compositions obtained by melting oligomers such as epoxy acrylate, urethane acrylate, polyester acrylate or polyether acrylate in polyfunctional acrylate monomers; or a mixture thereof. Among these compounds, polyesters, polypropylene, polyamides, polyvinyl alcohol and partially hydrolyzed products of ethylene-vinyl acetate copolymer are preferred, and polyesters are more preferred.
As the polyesters preferable as a raw material of the plastic film according to the present invention, there may be exemplified polyethylene terephthalate comprising not less than 80 mol % of ethylene terephthalate units, polyethylene naphthalate comprising not less than 80 mol % of ethylene naphthalate units, poly-1,4-cyclohexane dimethylene terephthalate comprising not less than 80 mol % of 1,4-cyclohexane dimethylene terephthalate units, or the like.
In addition, as copolymerizing components of the polyesters other than the above-mentioned components, there may be used diols such as diethylene glycol, propylene glycol, neopentyl glycol, polyethylene glycol or polytetramethylene glycol; dicarboxylic acids such as isophthalic acid, 2,6-na
Otani Yuzou
Yoshida Shigenobu
Conlin David G.
Edwards & Angell LLP
Hazzard Lisa Swiszcz
Mitsubishi Chemical Corporation
Nakarani D. S.
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