Heat-resistant brittle label

Abstract

A laser-markable, acrylic resin-based laminate having a thickness of 100 to 200 μm and including (A3) a pigmented layer made of a crosslinked acrylic resin obtained by crosslinking an acrylic resin composition having a hydroxyl value of 10 to 100 mg KOH/g, (B3) a base layer made of a crosslinked acrylic resin obtained by crosslinking an acrylic resin composition having a hydroxyl value of 18 to 40 mg KOH/g, and (C3) a destructible layer made of a crosslinked acrylic resin obtained by crosslinking a mixture of an acrylic resin composition having a hydroxyl value of 20 to 35 mg KOH/g and polymer beads.

1 . A laser-markable, acrylic resin-based laminate comprising:
 (A1) a pigmented layer having a thickness of 10 to 30 μm, being made of an acrylic resin, having a tensile elongation at break of less than 5%, and being adapted to provide the outermost surface when the laminate is attached to a substrate,   (B1) a base layer laminated with the pigmented layer, having a thickness of 30 to 60 μm, providing a visibly distinguishable color difference from the pigmented layer (A1), being made of an acrylic resin, and having a tensile elongation at break of 15% or more, and   (C1) a destructible layer laminated with the base layer (B1) and having a thickness of 20 to 150 μm, being made of an acrylic resin, and having a tensile elongation at break of less than 10%,   and having a thickness of 100 to 200 μm.   
     
     
         2 . The laser-markable, acrylic resin-based laminate according to  claim 1 , having a tensile elongation at break of 5% to 30%. 
     
     
         3 . The laser-markable, acrylic resin-based laminate according to  claim 1 , having a tensile strength of at least 20 N/10 mm. 
     
     
         4 . The laser-markable, acrylic resin-based laminate according to  claim 1 , wherein the acrylic resin is a crosslinked acrylic resin. 
     
     
         5 . The laser-markable, acrylic resin-based laminate according to  claim 1 , wherein the pigmented layer (A1) is white or black. 
     
     
         6 . A laser-markable label having the laser-markable, acrylic resin-based laminate according to  claim 1  and an adhesive layer on the side opposite to the pigmented layer. 
     
     
         7 . The laser-markable label according to  claim 6 , which is adapted to be imagewise irradiated with laser light to ablate the pigmented layer to form an image and attached to a substrate, the imaged pigmented layer being adapted to be destroyed to make the laminate non-reusable when the laminate is peeled off the substrate. 
     
     
         8 . A laser-markable, acrylic resin-based laminate comprising:
 (A2) a pigmented layer having a thickness of 10 to 30 μm, being made of an acrylic resin, having a tensile elongation at break of less than 5%, and being adapted to provide the outermost surface of the laminate when attached to a substrate,   (B2) a destructible layer laminated with the pigmented layer, having a thickness of 30 to 150 μm, providing a visibly distinguishable color difference from the pigmented layer (A2), being made of an acrylic resin, and having a tensile elongation at break of less than 8%, and   (C2) a base layer laminated with the destructible layer (B2), having a thickness of 40 to 80 μm, being made of an acrylic resin, and having a tensile elongation at break of 12% or more,   and having a thickness of 100 to 200 μm.   
     
     
         9 . The laser-markable, acrylic resin-based laminate according to  claim 8 , having a tensile elongation at break of 5% to 30%. 
     
     
         10 . The laser-markable, acrylic resin-based laminate according to  claim 8 , having a tensile strength of at least 25 N/10 mm. 
     
     
         11 . The laser-markable, acrylic resin-based laminate according to  claim 8 , wherein the acrylic resin is a crosslinked acrylic resin. 
     
     
         12 . The laser-markable, acrylic resin-based laminate according to  claim 8 , wherein the pigmented layer (A2) is white or black. 
     
     
         13 . A laser-markable label having the laser-markable, acrylic resin-based laminate according to  claim 8  and an adhesive layer on the side opposite to the pigmented layer. 
     
     
         14 . The laser-markable label according to  claim 13 , which is adapted to be imagewise irradiated with laser light to ablate the pigmented layer to form an image and attached to a substrate, the imaged pigmented layer being adapted to be destroyed to make the laminate non-reusable when the laminate is peeled off the substrate. 
     
     
         15 . A laser-markable, acrylic resin-based laminate comprising:
 (A3) a pigmented layer being made of a crosslinked acrylic resin obtained by crosslinking an acrylic resin composition with a melamine crosslinking agent and being adapted to provide the outermost surface of the laminate when attached to a substrate,
 the acrylic resin composition having a hydroxyl value of 10 to 100 mg KOH/g and comprising (A3-1) an acrylic polymer having a reactive functional group, (A3-2) cellulose acetate butyrate, and (A3-3) a pigment, 
   (B3) a base layer laminated with the pigmented layer (A3) being made of a crosslinked acrylic resin obtained by crosslinking an acrylic resin composition with an isocyanate crosslinking agent and providing a visibly distinguishable color difference from the pigmented layer (A3),
 the acrylic resin composition having a hydroxyl value of 18 to 40 mg KOH/g and comprising (B3-1) an acrylic polymer having a reactive functional group, (B3-2) a glycol compound, and (B3-3) a coloring material containing an acrylic resin having a reactive hydroxyl group and a pigment dispersed in the acrylic resin, and 
   (C3) a destructible layer laminated with the base layer (B3), being made of a crosslinked acrylic resin obtained by crosslinking a mixture of an acrylic resin composition and polymer beads with an isocyanate crosslinking agent,
 the acrylic resin composition having a hydroxyl value of 20 to 35 mg KOH/g and comprising (C3-1) an acrylic polymer having a reactive functional group, (C3-2) a glycol compound, and (C3-3) a coloring material containing an acrylic resin having a reactive hydroxyl group and a pigment dispersed in the acrylic resin, 
   and having a thickness of 100 to 200 μm.   
     
     
         16 . The laser-markable, acrylic resin-based laminate according to  claim 15 , wherein the amount of the isocyanate crosslinking agent of each of the base layer (B3) and the destructible layer (C3) is 1.1 to 1.3 equivalent weights based on the hydroxyl value of the acrylic resin composition of the respective layers. 
     
     
         17 . The laser-markable, acrylic resin-based laminate according to  claim 15 , wherein the coloring material of the base layer (B3) has a hydroxyl value of 5 to 30 mg KOH/g. 
     
     
         18 . The laser-markable, acrylic resin-based laminate according to  claim 15 , wherein the coloring material of the destructible layer (C3) has a hydroxyl value of 3 to 20 mg KOH/g. 
     
     
         19 . A laser-markable label comprising the laser-markable laminate according to  claim 15  and an adhesive layer on the side of the laminate opposite to the pigmented layer. 
     
     
         20 . The laser-markable label according to  claim 19 , being adapted to be imagewise irradiated with laser light to ablate the pigmented layer to form an image and attached to a substrate, the imaged pigmented layer being adapted to be destroyed to make the label non-reusable when the label is peeled off the substrate.