Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
1998-12-04
2001-09-04
Zirker, Daniel (Department: 1771)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S343000, C428S354000
Reexamination Certificate
active
06284369
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a sheet for forming a burned pattern, which has a pressure-sensitive adhesive layer with excellent disappearance property and is excellent in color retention, adhesion after burning, etc.
BACKGROUND ART
A sheet for forming a burned pattern comprising a ceramic green sheet and a pressure-sensitive adhesive layer formed thereon has been known (Examined Japanese Patent Publication No. 4-5258). This sheet is intended to be used in such a manner that information, e.g., a pattern, is imparted to the ceramic green sheet with a heat-resistant ink to form a label or the like and this sheet is provisionally bonded to an adherend through the pressure-sensitive adhesive layer and then burned.
As a result of the burning treatment, organic components such as an organic binder or a pressure-sensitive adhesive layer disappear and the ceramic green sheet becomes a burned object which is tenaciously adhered as a burned label to an adherend. Consequently, such a sheet for forming a burned pattern is suitable for use in, for example, forming a burned label having high durability, high heat resistance, etc., and can be advantageously used for, for example, controlling a production system in which many kinds of finished products, semifinished products, or parts each made of a metal, glass, burned ceramic, or the like are produced in small quantities.
However, the conventional sheet for forming a burned pattern had a problem that where the sheet is provisionally bonded to a glass product, e.g., a Braun tube, and baked by burning to give a burned label, etc., carbonaceous residues such as tar or carbon remain in a large amount, thereby decreasing the degree of coloration of the burned label, etc. The decrease in the degree of coloration particularly becomes the problem in the case that it is intended to impart a contrast of, e.g., white. Further, there has been another problem that the carbonaceous residues generate at the interface with an adherend and constitute a weak boundary layer, thereby decreasing the adhesion of the burned label or the like to the adherend.
An object of the present invention is to develop a sheet for forming a burned pattern which contains a small amount of carbonaceous residues due to burning treatment and can form a burned label or the like having, for example, excellent retention of a colored state, e.g., whiteness, and adhesion after burning to the adherend.
There is another problem that when the above-described sheet for forming a burned pattern is provisionally bonded to an adherend made of, e.g., a ceramic and then washed with water, that is, in the step for producing Braun tubes or the like, washing with water is conducted before applying a fluorescent substance, but in such a case, if the sheet for forming a burned pattern is washed with water without conducting preburning, water penetrates into the bonding interface to cause the sheet to peel off. Although such a problem can be avoided when the sheet for forming a burned pattern is preburned, there is a strong desire for elimination of the necessity of preburning in order to improve the production efficiency of Braun tubes or the like.
DISCLOSURE OF THE INVENTION
During intensive investigations in order to overcome the problems described above, the present inventors elucidated that an organic binder and a pressure-sensitive adhesive layer account for most of the organic components causative of carbonaceous residues such as tar and carbon. The inventors repeatedly made various investigations on these organic components and have found unexpected results that if a pressure-sensitive adhesive layer decomposable at low temperature is used, even if an organic binder which has been causative of carbonaceous residues such as tar and carbon is used, generation of such residues can be prevented. Namely, the detailed reasons are not clear, they have succeeded in preventing generation of carbonaceous residues attributable to an organic binder by using a pressure-sensitive adhesive layer decomposable at low temperature, thereby inhibiting the sheet as a whole from generating carbonaceous residues. The present invention has thus been achieved.
A first invention of the present invention is to provide a sheet for forming a burned pattern, comprising a ceramic green sheet layer to be burned and a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer is decomposable at low temperature and leaves a decreased amount of carbonaceous residues after burning.
A second invention of the present invention is to provide a sheet for forming a burned pattern, comprising a ceramic green sheet layer to be burned and a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer is formed from a laminated layer comprising at least two layers of an inner pressure-sensitive adhesive layer which is decomposable at low temperature and leaves a decreased amount of carbonaceous residues after burning and an outer pressure-sensitive adhesive layer having resistance to water washing.
According to the first invention, a sheet for forming a burned pattern can be obtained which as a whole is less apt to leave tar, carbon, etc. because even when the ceramic green sheet layer is formed by a conventional manner, the pressure-sensitive adhesive layer disappears at lower temperature during burning the green sheet layer while showing good thermal decomposability, and which satisfactorily retains a colored state, e.g., whiteness, because of the decreased stain by carbonaceous residues, and has excellent adhesion after burning to the adherend. Furthermore, the pressure-sensitive adhesive layer before burning is also excellent in provisional bonding to adherends.
According to the second invention, a sheet for forming a burned pattern can be obtained in which the pressure-sensitive adhesive layer before burning is excellent in provisional bonding to adherends, in particular the outer pressure-sensitive adhesive layer shows such adhesive strength that the sheet is prevented from peeling off upon washing with water, and which as a whole is less apt to leave carbon, tar, etc. because even when the ceramic green sheet layer is one formed according to the conventional manner, the pressure-sensitive adhesive layer disappears at lower temperature during burning the green sheet layer while showing satisfactory thermal decomposability, and which satisfactorily retains a colored state, e.g., whiteness, because of the decreased strain by carbonaceous residues and comes to have excellent adhesion to the adherend through burning.
REFERENCES:
patent: Re. 24906 (1960-12-01), Ulrich
patent: 5008151 (1991-04-01), Tominaga et al.
patent: 5089071 (1992-02-01), Tominaga et al.
patent: 0 306 727 A (1989-03-01), None
patent: 0 402 946 A (1990-12-01), None
patent: 0 570 926 A (1993-11-01), None
patent: 92005258 (1985-07-01), None
patent: 5-9448 (1993-01-01), None
patent: 6-337634 (1994-12-01), None
International Search Report
Itou Hidetoshi
Kume Katsuya
Kuramoto Mitsuo
Okazaki Katsuyuki
Tosaki Yutaka
Nitto Denko Corporation
Sughrue Mion Zinn Macpeak & Seas, PLLC
Zirker Daniel
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