US 11,987,409 B2
Packaged viscoelastic polymer substance
Klaus Massow, Hamburg (DE); Volker Lass, Bargteheide (DE); and Kay Brandes, Otter (DE)
Assigned to TESA SE, Norderstedt (DE)
Appl. No. 17/293,652
Filed by tesa SE, Norderstedt (DE)
PCT Filed Nov. 13, 2019, PCT No. PCT/EP2019/081165
§ 371(c)(1), (2) Date May 13, 2021,
PCT Pub. No. WO2020/099481, PCT Pub. Date May 22, 2020.
Claims priority of application No. 10 2018 219 353.3 (DE), filed on Nov. 13, 2018.
Prior Publication US 2022/0010177 A1, Jan. 13, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B65B 29/00 (2006.01); B29C 48/00 (2019.01); B29C 48/88 (2019.01); B29C 69/00 (2006.01); B65B 9/20 (2012.01); B65B 61/24 (2006.01); B65B 63/08 (2006.01); B65D 65/38 (2006.01); C09J 7/24 (2018.01); C09J 7/38 (2018.01); B29K 33/00 (2006.01); B29K 105/00 (2006.01)
CPC B65B 29/00 (2013.01) [B29C 48/0011 (2019.02); B29C 48/0019 (2019.02); B29C 48/0022 (2019.02); B29C 48/919 (2019.02); B29C 69/001 (2013.01); B65B 9/20 (2013.01); B65B 61/24 (2013.01); B65B 63/08 (2013.01); B65D 65/38 (2013.01); C09J 7/243 (2018.01); C09J 7/245 (2018.01); C09J 7/385 (2018.01); B29K 2033/08 (2013.01); B29K 2105/0097 (2013.01); C09J 2301/414 (2020.08); C09J 2423/046 (2013.01); C09J 2423/106 (2013.01); C09J 2431/006 (2013.01); C09J 2433/00 (2013.01)] 14 Claims
 
1. A method for producing a packaged viscoelastic polymer substance, the method comprising:
a) plastifying a viscoelastic polymer substance at elevated temperatures, the viscoelastic polymer substance being a polymer substance based on poly(meth)acrylates having a weight-average molecular weight of 500,000 g/mol or more;
b) continuously dispensing the plastified viscoelastic polymer substance into a protective polymer film, the protective polymer film having no self-adhesive properties and having been brought into a tubular form before said continuous dispensing so as to be filled with the plastified viscoelastic polymer substance, thereby forming a strandlike polymer assembly having a diameter of 55 to 70 mm, a core of the plastified viscoelastic polymer substance, and a shell of the protective polymer film, wherein a fraction of the protective polymer film, based on a total weight of the protective polymer film and the plastified viscoelastic polymer substance, is less than 1.0 wt %, and wherein the plastified viscoelastic polymer substance has a viscosity of more than 100 Pas during said continuous dispensing into the tubular protective polymer film;
c) converting the strandlike polymer assembly into a flattened strandlike polymer assembly with a smallest cross-section having a ratio of width to height of about 2:1 to 7:1;
d) cooling the flattened strandlike polymer assembly to a temperature at which the strandlike polymer assembly is still plastically deformable; and
e) converting the cooled flattened strandlike polymer assembly at the plastically deformable temperature by squeezing into an elongate polymer assembly comprising a multiplicity of squeeze points, the squeeze points subdividing the polymer assembly into a multiplicity of first regions and a multiplicity of second regions, wherein each of the first regions have a length of at least about 300 mm and a cross-section of the first regions corresponds substantially to a cross-section of the strandlike polymer assembly, wherein the second regions are formed by the squeeze points with thicknesses resulting from thicknesses of the protective polymer film and the viscoelastic polymer substance that remains in regions of the squeeze points, and wherein the second regions have a length corresponding to once to twice a maximum extent along the cross-section of the first regions.