| 摘要 |
A pressure sensitive adhesive tape comprises a carrier layer having a thickness of 0.25 to 2.0 millimeters and comprising an electron beam cured pressure sensitive adhesive matrix, 10 to 20 % by volume low density microspheres and at least one pigment in an amount sufficient to color the tape. Preferably, fumed silica is present in an amount up to 5 % by weight. The tape preferably has a skin layer on each side of the carrier layer. The skin layer has a coating thickness of 25 to 125 g/m<2> and comprises a pressure sensitive adhesive matrix free of rigid, low density microspheres. The process comprises first preparing an adhesive composition containing electron beam-curable adhesive polymer matrix, fillers and solvent. The composition is introduced and conveyed through a twin screw extruder (10). In the extruder, solvent is removed in one or more solvent removal units (11, 12, 13), and a solvent-free composition is extruded as the carrier layer. Skin layers may be coextruded with the carrier layer. |
