Pressure sensitive adhesive tape with excellent recyclability

In order to fix the automobile exterior components to the automobile coating plate, acrylic pressure-sensitive adhesive tape or adhesive sheet is widely used (below, sometimes “tape or sheet” is referred to only as “tape” or “sheet”). For the pressure-sensitive adhesive tape used for this purpose, inorganic or organic filler materials may be added in order to enable the tape to withstand the weight of the member itself and the high cohesion and shear strength of the rebound, in order to improve the workability, or in order to reduce the weight. As such inorganic filling materials, you can list silica, calcium carbonate, clay, iron oxide, glass microspheres alumina microspheres, and so on. In addition, as an organic filling material, you can list poly microspheres, polyvinylidene chloride microspheres, acrylic resin microspheres, etc.

However, in the general external pressure sensitive adhesive tape system, the inorganic filler material used as a filler material is added more, therefore, non-adhesive particles will be mixed into the surface of the piece and cause the adhesive decline, the adhesive reduction is more significant under low temperature and low-pressure relay conditions. In addition, in the case of weatherstripping, which is made of soft rubber and hollow members, the pressure relay applied to the member is dispersed and eased by the member, so that it cannot exert sufficient force on the adhesive interface so that sometimes poor fixation occurs.

In the case of pressure-sensitive adhesive tape with, for example, a double-sided adhesive layer, sometimes in a surface adhesive to the adhesive, the other side is provided with a stripping gasket state for cutting, processing, and then until the use of a certain time. This is especially the case with long, flexible elements such as weather stripping, which are sometimes stored in a rolled-up state from a space-saving point of view. In this way, when the pressure-sensitive adhesive tape is provided with a stripping liner is kept in a bent state, sometimes the stripping liner will be partially stripped from the pressure-sensitive adhesive layer, resulting in the so-called “pad warping”, so that the pressure-sensitive adhesive layer is polluted.

In order to suppress the above-mentioned peeling liner warping, a peeling liner with increased peeling force can be used. However, in this case, although the peeling liner warping is improved, the peeling performance is decreased. In other words, there is a contradictory (tradeoff) relationship between the inhibition of pad warping and the stripping function. In addition, in order to inhibit the warping of the liner, there are known methods to use materials containing polar groups as the stripping layer, but this method is difficult to recycle. Since the stripping gaskets are discarded after use, a pressure-sensitive adhesive tape with excellent recyclability is now expected from the point of view of environmental load.