Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1998-04-17
2000-08-15
Krynski, William
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428 76, 4285422, 4285426, B32B 300
Patent
active
061033529
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a decorative material and particularly to a decorative material, for building materials, which can impart a desired design to the surface of furniture, wall surface, and floor covering and the like and possesses excellent surface protective properties.
BACKGROUND ART
A decorative sheet comprising a surface protective layer, constituted by a layer of a resin cured by ionizing radiation irradiation, provided on the surface of a decorative sheet for a building material has been proposed in the art.
Since this conventional surface protective layer is in a cured state, the layer strength of the surface protective layer per se is excellent. However, when the surface protective layer is provided contiguously to other layer(s), that is, when a solid print layer, a pattern layer and the like and the surface protective layer are laminated on a substrate sheet, the adhesive strength between the solid print layer and the pattern layer and the surface protective layer is disadvantageously low. Therefore, the conventional decorative sheet has poor Hofmann's scratch resistance and, hence, in some cases cannot be practically used because the decorative sheet particularly in its horizontal face portion is easily scratched.
DISCLOSURE OF THE INVENTION
An object of the present invention is to solve the above problem of the prior art and to provide a decorative sheet possessing high adhesive strength between the surface protective layer and each layer laminated onto the surface protective layer and, in addition, excellent scratch resistance.
According to the present invention, the above problem can be solved by incorporating a compound having active hydrogen into any one of a surface protective layer and a layer contiguous to the surface protective layer, incorporating an isocyanate compound into the other layer, and curing these layers.
The present invention specifically includes the following aspects.
According to one aspect of the present invention, there is provided a decorative sheet comprising: a substrate sheet; a contiguous layer provided on the substrate sheet; and a surface protective layer provided on the contiguous layer, the surface protective layer comprising an ionizing radiation-curing resin composition, the contiguous layer comprising a compound containing active hydrogen, the surface protective layer further comprising an isocyanate compound, the contiguous layer and the surface protective layer being in a cured state.
According to another aspect of the present invention, there is provided a decorative sheet comprising: a substrate sheet; a contiguous layer provided on the substrate sheet; and a surface protective layer provided on the contiguous layer, the surface protective layer comprising an ionizing radiation-curing resin composition, the contiguous layer comprising an isocyanate compound, the surface protective layer further comprising a compound having active hydrogen, the contiguous layer and the surface protective layer being in a cured state.
According to a preferred embodiment of the present invention, the compound having active hydrogen is a compound having a group selected from the group consisting of polyol, COOH, and NH.sub.2 groups.
According to another embodiment of the present invention, the contiguous layer further comprises an isocyanate group-containing acrylate monomer and/or prepolymer.
According to the present invention, an ionizing radiation-curing resin contained in the surface protective layer is self-reacted and consequently crosslinked or polymerized, and, in addition, the compound having active hydrogen, contained in any one of the contiguous layer and the surface protective layer, and the isocyanate compound contained in the other layer are chemically reacted with each other, permitting the contiguous layer and the surface protective layer to be strongly bonded to each other in the interface of these layers, which results in markedly increased ply adhesive strength and improved Hofmann's scratch resistance of the surface p
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patent: 5633317 (1997-05-01), Kawasaki et al.
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Database WPI, Section Ch, Week 9035, Derwent Publications Ltd., JP 02 185710 Jul. 1990, Abstract Only.
Database WPI, Section CH, Week 8617, Derwent Publications Ltd., JP 60 224119 Nov. 1985, Abstracts Only.
Database WPI, Section Ch, Week 8539, Derwent Publications Ltd., JP 60 154327 Aug. 1985, Abstract Only.
Dai Nippon Printing Co. Ltd.
Krynski William
Xu Hong J.
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