SINGLE-LAYER LASER LABEL

PURPOSE: To simplify a structure, to enhance the reliability of products and to eliminate the need for countermeasuring environment pollution by applying a tacky adhesive compsn. on a supporting layer made of plastic contg. additives, varied in colors under irradiation with a laser and covering this compsn. with release paper, etc. CONSTITUTION: The supporting layer made of the plastic, such as polyester, poly(meth)acrylate or polycarbonate, contains the additives, consisting of the org pigments and metal salt, more preferably copper phosphate hydroxide or iriodein, varied in the colors under the irradiation with the laser at max. 10wt.% in the number of parts per 100 parts of base material polymer. The tacky adhesive compsn. is applied on one surface of such supporting layer made of the plastic and is coated with the release paper or release film, subjected to a silicon treatment. The drastic change in the color tones is induced by using the standard laser, more preferably an Nd-YAG solid laser of a wavelength of 1.06μm, by which the markings of distinct contours and high contrast are obtd. and the marking speed is increased. In addition, generation of aerosol is reduced to zero or extremely low in quantity.