Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Reexamination Certificate
1998-12-22
2001-10-23
Copenheaver, Blaine (Department: 1773)
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
C428S332000, C428S334000, C428S335000, C428S523000, C525S222000, C525S227000, C525S231000
Reexamination Certificate
active
06306520
ABSTRACT:
The present invention relates to a laminated film or sheet formed by adhesively integrating a resin layer of an acrylic resin with a resin composition layer of a resin composition which comprises a specific ethylene based copolymer, a polyethylene resin and a polypropylene resin, a process for producing the laminated film or sheet, and a laminated structure formed by adhesively integrating the laminated film or sheet with a substrate of a polyolefin resin composition.
With respect to a creation of decoration on a surface of a polyolefin resin film or sheet, there is known a laminated film or sheet formed by adhesively integrating a film of an acrylic resin, to which a printing is applied, with a surface of the polyolefin resin film or sheet, for example, in Japanese Patent Kokai(JP-A-) Nos.9-193189 and 9-234836.
As known, a polyolefin resin and an acrylic resin are difficult to melt-adhere with each other. Therefore, in order to obtain a laminated film or sheet by adhesively integrating a film or sheet of the polyolefin resin with a film of the acrylic resin, it is indispensable to interpose a layer of an adhesive agent between them. In fact, the laminated film or sheet disclosed in the foregoing Japanese Kokais has a layer of an adhesive agent between them.
However, in the laminated film or sheet having the layer of the adhesive agent, there are problems such that a thickness of the product becomes unduly large and a production cost becomes too high due to the presence of the layer of the adhesive agent.
The former problem, namely, an unduly large thickness of the film or sheet leads to an additional problem. In the production process of a laminated structure using the above-mentioned film or sheet having the unduly large thickness, wherein a molten polyolefin resin is injected on the film or sheet set in an injection mold so as to adhesively integrate them with each other, a warp of the resulting laminated structure easily occurs. Incidentally, it is difficult to prevent the occurrence of the warp even by varying the molding and processing conditions for the laminated structure.
As to the laminated structure formed by adhesively integrating the laminated film or sheet having unduly large thickness with the polyolefin resin, there is caused a further problem. That is, at a temperature region wherein a ductile fracture of the polyolefin resin is to occur, not a ductile fracture, but a brittle fracture thereof occurs. This means inferiority in a low temperature impact property.
An object of the present invention is to provide a laminated film or sheet, wherein a film or sheet of a polyolefin resin and a film of an acrylic resin are adhesively integrated with each other to the satisfaction, even if no layer of an adhesive agent is interposed between them, a process for producing the same and a laminated structure formed by using the same.
The present inventors have undertaken a study to obtain a laminated film or sheet, wherein a film or sheet of a polyolefin resin and a film of an acrylic resin are adhesively integrated with each other to the satisfaction, even if no layer of an adhesive agent is interposed between them, and as a result, the inventors have found a fact that a desired film or sheet can be obtained by using a specific polyolefin resin composition as the polyolefin resin, and then attained to the present invention.
The present invention provides a laminated film or sheet formed by adhesively integrating a resin layer (
1
) of an acrylic resin with a resin composition layer (
2
) of a resin composition, the resin composition comprising 100 parts by weight of an ethylene based copolymer (a) prepared by polymerizing ethylene with at least one compound selected from the group consisting of unsaturated carboxylic acids, unsaturated carboxylic esters, unsaturated carboxylic anhydrides and vinyl acetate, 0 to 10 parts by weight of a polyethylene resin (b) based on 100 parts by weight of the ethylene based copolymer (a), providing that the polyethylene resin (b) excludes the copolymer (a), and 1 to 30 parts by weight of a polypropylene resin (c) based on 100 parts by weight of the copolymer (a).
The present invention also provides a process for producing the above-mentioned laminated film or sheet, which comprises a step of subjecting a surface of the resin layer (
1
) of the acrylic resin to corona discharge treatment, and a step of bringing the treated surface into contact with the resin composition layer (
2
) melt-extruded in the form of a film, followed by pressure-adhesion to perform a lamination.
The present invention further provides a laminated structure formed by adhesively integrating the above-mentioned laminated film or sheet with a substrate (A) of a polyolefin resin composition at a side of the resin composition layer (
2
).
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Nagata Makoto
Takahata Hiroaki
Birch & Stewart Kolasch & Birch, LLP
Copenheaver Blaine
Paulraj Christopher
Sumitomo Chemical Company Limited
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