Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
1999-02-08
2001-10-16
Gallagher, John J. (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S324400, C524S501000
Reexamination Certificate
active
06302994
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a process for producing an article with a label, which article comprises an adhered and a pressure-sensitive adhesive label attached thereto and in which article the pressure-sensitive adhesive label can be easily peeled from the adhered by contacting the bonded area with an aqueous alkali solution. In the article with a label according to the present invention, the adhesive layer of the pressure-sensitive adhesive label attached to the adhered has excellent water resistance and adhesion strength.
BACKGROUND ART
Labels to be attached to bottles for drinks (e.g. bottle for beer) are required to have a high adhesion strength to an article (e.g. bottle) and, after having been attached to an article (e.g. bottle), are required to have high water resistance when immersed in water and a property that they are peeled from the article in a short time when washed with an aqueous alkali solution (the property is hereinafter referred to as “alkali peelability”).
As the adhesives used in such labels, there have been used starch-based adhesives, casein-based adhesives, polyvinyl alcohol-based adhesives, etc.; that is, “cold glues”, etc.
In attaching a label to an article using a cold glue, a method is ordinarily adopted in which an adhesive is coated on the back side of a label and immediately the label is attached to an article. Therefore, in order to conduct this attaching operation continuously at a high speed, it is necessary to conduct two kinds of operations, namely, coating of an adhesive and attaching of a label mechanically. A machine having such functions is expensive and has been used only in limited fields.
Cold glues have had another problem. That is, cold glues ordinarily contain a slight amount of water for viscosity adjustment; when a cold glue is applied to a paper label and the label is attached to an article, the water in cold glue infiltrates into the label, inviting the curling (warpage) of the label.
Meanwhile, it was investigated to use, in applications where alkali peelability of a label is required, a pressure-sensitive adhesive having higher alkali solubility or swellability, obtained by slightly modifying the structure of the acrylic acid ester copolymer widely used as a conventional pressure-sensitive adhesive. In pressure-sensitive adhesives of acrylic acid ester copolymer type, however, the alkali peelability is insufficient in many cases; increase in alkali peelability results in reduced water resistance; when a beer bottle or the like to which a label using such a pressure-sensitive adhesive has been attached, is placed in water, the label tends to peel off.
The present invention is intended to provide a process for producing an article with a label satisfying that the label is attached to the article as an adhered with an adhesive layer having excellent resistance to ordinary water (e.g. tap water) and the label is easily peeled from the adhered by washing with an aqueous alkali solution.
DISCLOSURE OF THE INVENTION
The present inventors made a keen study to achieve the above task. As a result, the present invention has been completed.
The present invention lies in a process for producing an article with a label, which comprises attaching, to an article, a heat-sensitive and pressure-sensitive adhesive label having an adhesive layer composed of a pressure-sensitive adhesive composition, which is an aqueous emulsion type composition comprising:
(A) a water-soluble resin obtained by neutralizing a resin having an acid value of 1 meq/g or more, with a base, and
(B) a polymer having an acid value of 0.6 meq/g or less and a glass transition temperature of −20° C. or lower, obtained by emulsion polymerization of a radical-polymerizable monomer,
and which, when made into an aqueous film and dried at a temperature lower than 60° C., becomes a film (1) of two-phase structure wherein particles composed of the component (B) are dispersed in a continuous phase composed of the component (A) and, when the film (1) is heated to a temperature of 60° C. or higher, is converted into a pressure-sensitive adhesive film (2) wherein the forms of the component (A) and the component (B) in the above two-phase structure are reversed and particles of the component (A) are dispersed in a continuous phase of the component (B).
REFERENCES:
patent: 4420583 (1983-12-01), Hutton
patent: 4427744 (1984-01-01), Hume
patent: 0 574 803 A2 (1993-12-01), None
patent: 5-117612 (1993-05-01), None
patent: 5-230427 (1993-09-01), None
Iesako Hiroshi
Kamiya Daisuke
Kato Hitoshi
Kirito Yoichi
Koketsu Akemi
Browdy and Neimark
Gallagher John J.
Toagosei Co. Ltd.
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