METHOD FOR CREATING A FOAMED MASS SYSTEM
A method for producing a foamed mass system comprising thermally sensitive substances, wherein the mass system is foamed at a first temperature in a first step, and the thermally sensitive substances are added to the mass system in a subsequent step at a second temperature lower than the first temperature
1 . A method for producing a foamed mass system comprising thermally sensitive substances, in which the mass system is foamed in a first step at a first temperature, and the thermally sensitive substances are added to the mass system in a following step at a second temperature, which is lower than the first temperature.
2 . The method of claim 1 , wherein
the first temperature, at which the mass system is foamed, corresponds to or lies above the expansion temperature of the microballoons, and the second temperature, at which the thermally sensitive substances are added to the mass system, lies below the expansion temperature of the microballoons.
3 . The method of either claim 1 , wherein
in a first mixing assembly, expandable microballoons, and optionally further additives, are introduced into a mass system;
the mass system with the microballoons added is heated under superatmospheric pressure to a temperature of at least the expansion temperature of the microballoons under atmospheric pressure,
the microballoons are expanded on emergence from the first mixing assembly,
the mass system is introduced into a second mixing assembly wherein the mass system is at a temperature which lies below the expansion temperature of the microballoons,
the thermally sensitive substances are added in the second mixing assembly, where it is blended with the mass system
the mass system thus blended is shaped.
4 . The method of claim 1 , wherein
in a first mixing assembly expandable microballoons and optionally further additives are introduced into a mass system;
the mass system with the microballoons added is heated under superatmospheric pressure in a first mixing zone of the mixing assembly to a temperature of at least the expansion temperature of the microballoons under atmospheric pressure,
the mass system is subsequently transferred from the first mixing zone into a second mixing zone of the first mixing assembly, at a temperature below the expansion temperature of the microballoons,
the thermally sensitive substances are added during transfer of the mass system to the second mixing zone and/or after transfer to the second mixing zone, where it is blended with the mass system,
the mass system thus blended is shaped.
5 . The method of claim 1 , wherein the mass system is or comprises a self-adhesive.
6 . The method of claim 1 , wherein the thermally sensitive substances or a portion of the thermally sensitive substances are thermal crosslinkers.
7 . The method of claim 1 , wherein the thermally sensitive substances or a portion of the thermally sensitive substances are accelerators and/or regulators for a thermal crosslinking reaction.
8 . The method of claim 1 , wherein the mass system, on addition of the thermally sensitive substances, is present in a noncrosslinked state.
9 . The method of claim 3 , wherein the foamed mass system provided with the thermally sensitive substances is shaped to form a layer on a carrier material or release material.
10 . The method of claim 6 , wherein the mass system is thermally crosslinked.
11 . The method of claim 9 , wherein the thermal crosslinking reaction or a major part of the thermal crosslinking reaction takes place after the shaping to form the layer on the carrier material or release material.
12 . A foamed mass system produced by the method of claim 1 .
13 . A self-adhesive, for a single- or double-sidedly (self-)adhesive tape, comprising the foamed mass system of claim 12 .