Pressure-Sensitive Adhesive for Pressure-Sensitive Adhesive Tape, Tape Cassette, and Tape Printer

A tape cassette for a tape printer which performs printing on a printing tape by using a thermal head,

• the tape cassette accommodating:
• a printing tape spool on which a printing tape made of a polyethylene terephthalate film is wound;
• a ribbon spool on which an ink ribbon is wound;
• and a double-sided pressure-sensitive adhesive tape spool on which a double-sided pressure-sensitive adhesive tape which includes a substrate film, pressure-sensitive adhesive layers formed on both surfaces of the substrate film and a release sheet stuck on one of the pressure-sensitive adhesive layers is wound, so that a print image such as character is formed on the printing tape by the thermal head and the ink ribbon while other one of the pressure-sensitive adhesive layers is stuck on the print image,
• wherein pressure-sensitive adhesive forming the pressure-sensitive adhesive layers of the double-sided pressure-sensitive adhesive tape is adjusted so as to satisfy conditions that, slow peel strength when the polyethylene terephthalate film is peeled off from the substrate film of the pressure-sensitive adhesive tape by 5 mm at peel rate of 0.5 mm/minute is 0.45 N/20 mm or higher and storage modulus of the adhesive layer is in a range from 90.7 kPa to 435 kPa.

A tape printer comprising:

• a thermal head;
• a tape cassette accommodating a printing tape spool on which a printing tape made of a polyethylene terephthalate film is wound, a ribbon spool on which an ink ribbon is wound, and a double-sided pressure-sensitive adhesive tape spool on which a double-sided pressure-sensitive adhesive tape which includes a substrate film, pressure-sensitive adhesive layers formed on both surfaces of the substrate film and a release sheet stuck on one of the pressure-sensitive adhesive layers is wound, so that a print image such as character is formed on the printing tape by the thermal head and the ink ribbon while other one of the pressure-sensitive adhesive layers is stuck on the print image;
• and
• a conveyance unit drawing the printing tape, the ink ribbon and the double-sided pressure-sensitive adhesive tape from the printing tape spool, the ink ribbon spool and the double-sided pressure-sensitive adhesive tape spool, respectively, for conveyance of those,
• wherein pressure-sensitive adhesive forming the pressure-sensitive adhesive layers of the double-sided pressure-sensitive adhesive tape is adjusted so as to satisfy conditions that, slow peel strength when the polyethylene terephthalate film is peeled off from the substrate film of the pressure-sensitive adhesive tape by 5 mm at peel rate of 0.5 mm/minute is 0.45 N/20 mm or higher and storage modulus of the adhesive layer is in a range from 90.7 kPa to 435 kPa.