Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Reexamination Certificate
1998-11-20
2001-04-24
Hess, Bruce H. (Department: 1774)
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
C428S213000, C428S207000, C428S343000, C428S523000, C428S220000
Reexamination Certificate
active
06221465
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a plastic decorative sheet for decorative materials, such as a plastic decorative laminate and a plastic-coated steel plate, which are used for furniture, constructional interior materials, and the like.
BACKGROUND OF THE INVENTION
Decorative materials such as plastic decorative laminates are generally comprising a substrate, such as plywood or steel, overlaid with a decorative sheet having a single printed and/or colored film or a laminate thereof. The laminate type decorative sheet usually comprises a transparent surface layer and a printed and/or colored layer, which are bonded with each other via, if necessary, an adhesive layer. The decorative sheet is used in the form of a laminate on a substrate such as plywood with an adhesive layer therebetween.
The surface layer or the printed and/or colored layer usually contains an ultraviolet absorber (UV absorber) as a weatherability assistant to prevent the printed and/or colored layer from fading or to prevent the whole sheet from deterioration by light during use.
Vinyl chloride resins have been used widely as a base resin of the decorative sheet for their, excellent design properties and proccessability but have recently been being replaced with polyolefin resins from considerations of hydrogen chloride gas by-produced in thermal disposal after use and the material of incinerators. Being nonpolar, however, polyolefin resins have poor compatibility with UV absorbers, which have high polarities. Therefore, if an UV absorber is added to polyolefin resins in an amount effective for preventing fading or deterioration, cases are often met with in which the UV absorber blooms to the surface of the decorative sheet during sheet formation or subsequent fabrication, which not only deteriorates the appearance of the decorative sheet but also contaminates equipment such as a mold and rolls. Further, the UV absorber tends to fail to accomplish its object due to the blooming loss.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a polyolefin-based film for a decorative sheet (hereinafter simply referred to as a polyolefin film) which is free from the above-described disadvantages, i.e., a polyolefin film which is protected against fading or deterioration by light while suppressing blooming of an UV absorber incorporated therein.
Another object of the present invention is to provide a decorative sheet having the polyolefin film, and a decorative material having the decorative sheet.
Other objects and effects of the present invention will become apparent from the following description.
The above described objects of the present invention have been achieved by providing a polyolefin film containing a benzotriazole UV absorber having a specific molecular weight or a specific vapor pressure. That is, the present invention relates to the following films, decorative sheets and decorative materials.
(1) A film for a decorative sheet comprising a polyolefin and a benzotriasole ultraviolet absorber having a molecular weight of from 380 to 1000.
(2) The film according to the above (1), wherein said benzotriazole ultraviolet absorber has a molecular weight of from 380 to 600.
(3) A film for a decorative sheet comprising a polyolefin and a benzotriazole ultraviolet absorber having a vapor pressure of not higher than 1×10
−8
mmHg (absolute pressure) at 20° C.
(4) The film according to the above (1) or (3), wherein the temperature at which the rate of thermogravimetric change of said benzotriazole ultraviolet absorber reaches 1% is 200° C. or higher.
(5) The film according to any one of the above (1) to (4)# wherein said polyolefin is a polypropylene resin.
(6) The film according to any one of the above (1) to (5), wherein said benzotriazole ultraviolet absorber is present in an amount of from 0.01 to 10 parts by weight per 100 parts by weight of the polyolefin.
(7) The film according to any one of the above (1) to (6), further containing a hindered amine light stabilizer.
(8) The film according to the above (7), wherein said hindered amine light stabilizer is present in an amount of from 0.01 to 10 parts by weight per 100 parts by weight of the polyolefin.
(9) The film according to the above (7) or (8), wherein said hindered amine light stabilizer has a molecular weight of 1000 or more.
(10) The film according to the above (7) or (8), wherein said hindered amine light stabilizer is a polyethylene resin having copolymerized with 1 to 10% by weight of a hindered amine light stabilizer having an unsaturated group.
(11) The film according to any one of the above (1) to (10), having a thickness of from 0.05 to 1 mm.
(12) A decorative sheet comprising a printed film which comprises a film according to any one of the above (1) to (11) and one surface of which is printed.
(13) a decorative sheet comprising a colored film which comprises a film according to any one of the above (1) to (11).
(14) A decorative sheet which comprises a film according to any one of the above (1) to (11) having provided thereon an adhesive layer and a layer subjected to at least one of printing and coloring.
(15) A decorative material which comprises a substrate having provided thereon an adhesive layer and a decorative sheet according to any one of the above (12) to (14).
According to the present invention, since blooming of the UV absorber is suppressed, the film for a decorative sheet exhibits UV absorbing performance of long duration and therefore hardly undergoes fading or deterioration by light or increase in haze.
REFERENCES:
patent: 5622760 (1997-04-01), Leiss
patent: 5668199 (1997-09-01), Suhadolnik et al.
patent: 5770643 (1998-06-01), Wehner et al.
patent: 5804622 (1998-09-01), Zinke et al.
patent: 5814688 (1998-09-01), Hilti et al.
patent: 5955517 (1999-09-01), Hilti et al.
patent: 6-198830 (1994-07-01), None
patent: 6-198831 (1994-07-01), None
patent: 8-1881 (1996-01-01), None
patent: 10-245458 (1998-09-01), None
Furuya Ken
Hori Kazuya
Hess Bruce H.
Mitsubishi Chemical MKV Company
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Shewareged B.
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